TamarD Logbook

9/5/08

Detector Construction

   4 chambers are built.   

TGEM:

Foils have been mounted on the TGEM comparison chamber.  Both charge collectors are mounted on the TGEM test detectors.  One TGEM test detector has the Thick PC board GEM foils which need much higher HV than the regular GEM foils.  The second TGEM test chamber has 3 GEM foils from CERN.

Need a min of 32 1 Meg Ohm resistors to complete the output termination connectors. Need 32 more termination connectors made from 16 wires.

Need to grind down 16, M3 bolts for mounting the GEM foils and TGEM PCboards.

Need 24 washers for GEM foils. Check mounting of the TGEM boards. Look up spacing and HV for the TGEM boards[1], Media:01352098.pdf .

Need to etch 2 cathodes for the TGEm boards.

Qweak:

  a.) Need to do final outer footprint machining so there is no interference with the Electron profile of the other octant.

  b.)  Need to machining back of the chamber for the Charge collector

 c.) Need to machine thick frames for the cathode and maybe GEM foils.

 d.) Apply electrical insulation to HV distribution boards

 e.) Need to mount GEM foils on the Qweak chambers.

SIS3610 I/O software

Objectives: a.) The first step will be to read 16 of the I/O input channel into a CODA data file.

b.) Display the 16 input channels on a GUI. Unfortunately, only 2 of the 16 will be used to read in the GEM output. The GEM output will transfer 128 hit/no hit signals to a single I/O channel in a serial fashion. The data from one I/O channel needs to be decoded according to the data structure described in Figure 8 and 9 of the VFAT manual.

c.) The final task will be to write a multiple trigger function so the I/O can be triggered by several different interrupt trigger signals and label those trigger signals.

Tasks:

Inject a signal into the I/O board input connector and use a Read function from the ROC to determine if the signal is high or low.

9/19/08

Detector work

TGEM assembled and ready for testing.

Need to assemble GEM comparison detector.

Made 2 thick frames for Qweak Cathode.

Get Fe source from TSO on loan for many months.(done)

Machine hole punch for Qweak charge collector holes(done)

Drill holes in Qweak chamber for Charge collector mounting

 Measure sag of Qweak foils and cathode.  Try using a string stretched across the frame

SIS3610 I/O software

Tasks:

Inject a signal into the I/O board input connector and use a Read function from the ROC to determine if the signal is high or low.

The SIS module latches input when a VME read is initiated

The command below sets a low constant output level on the SIS output which is then conencted to one of the SIS input line directly.

-> s3610WriteOutput(0,12288)
value = 0 = 0x0

I initiated a read function and saw the following bits set

-> s3610ReadInput(0)        
value = 18464 = 0x4820

Now I zero the output and read call the read function

-> s3610WriteOutput(0,0)    
value = 0 = 0x0

-> s3610ReadInput(0)    
value = 2080 = 0x820

I am clearly turning bits on and off but there is some randomness to other channels. Perhaps terminationg the other channels in 100 Ohms will solve this problem.

Check

created subroutine in SIS3610 library to generate a single pulse according to an given bit pattern passed as a decimal number

void TDpulse(int id, unsigned int val) {

 if((id<0) || (s3610p[id] == NULL)) {
   logMsg("s3610WriteOutput: ERROR : SIS3610 id %d not initialized \n",id,0,0,0,0,0);
   return;
 }

 s3610p[id]->d_out = val;
 s3610p[id]->d_out = 0;
 return;

}

-> TDpulse(0,12288) value = 0 = 0x0

Now we tried to use

-> TDpulse(0,12288) value = 0 = 0x0 -> s3610ReadInput(0) value = 2080 = 0x820

2080 d = 100011000 b => channel 4,5 and 9 were high

The input did not change

I think we need to Latch it.

18464 d = 100100000100000 b

Read manual to see how to latch the input.

9/26/08

Detector Construction

Both GEM and TGEM proto type detectors have been assembled.

TGEM draws 200 [math]\mu[/math] A at 800 Volts Need to see why.

Ramp voltage at 1 V/sec. Saw discharges on scope when increasing HV at rate of 5 V/s.

Ramping up the voltage on TGEM and GEM at 2 V/sec.

GEM Drift HV (Volts)	GEM Drift current [math]\mu[/math] A	GEM foil HV (Volts)	GEM foil current [math]\mu[/math] A
3800	0	3500	845

GEM Detector HV settings and Pulses

GEM Drift HV (Volts)	GEM foil HV (Volts)	GEM foil current [math]\mu[/math] A	Scope Picture
3950	3650	882
3900	3600	870
3850	3550	859

TGEM Drift HV (Volts)	TGEM Drift current [math]\mu[/math] A	TGEM foil HV (Volts)	TGEM foil current [math]\mu[/math] A
3600		3300

SIS310

1.) Get 100 Ohm resistors

2.) Get Bread board

10/3/08

The high current draw (> 1mA) of the TGEM on the power supply has forced us to switch to powering each PCboard GEM individually. We now have 4 HV channels hooked up with the ground floating on the top 2 GEM PCboards.

GEM Detector

Vdrift = 3800, VGem = 3500, IDrift = 0, IGem = 842 [math]\mu[/math] A. Channel 1 is the output of 16 strips tied together. The remaining output strips have a 1 M Ohm resister to ground. Channel 2 is the Trigger output (the output from the last foil). Notice the sign difference between the 2 outputs.

Noise Level

Vdrift = 3850, VGem = 3550, IDrift = 0, IGem = 858 [math]\mu[/math] A

Output from the GEM detector strips and from TrigOut after signal goes through the Timing Filter Amp(amplifier was set to "x10").

The output from GEM detector strips and TrigOut(after it goes through electronics):

300px

Noise level will be documented.

The GEM detector is working!
GEM DETECTOR IS READY WITH ELECTRONICS

THGEM Detector

Lets check the TGEM detector

Media:TheTHGEM_MasterThesis_Chen_Ken_Shalem.pdf

The distance between the THGEM foils is 2 mm(before it was ~1.5 mm) and the distance between the last THGEM foil and cathode is about ~5 mm. I have not changed the distance between the PCB(Charge collector) and the first THGEM foil.(might do it)
THGEM detector is not working still at high voltages. For now HVSettings are following(I still have sparks, but they are very few, and I think they come from THGEM foils)

HVsettings

Cathode HV (Volts)	First THGEM foil(Volts)	Second THGEM foil(Volts)	Third THGEM foil(Volts)	Third THGEM foil current [math]\mu[/math]A
3000	1650	1500	1500	1181

11/21/08

a.)ship out Qweak GEM

Rectangular GEM detector works after replacing all 3 GEM preamp foils!!!!!!!!

Media:thesis-2004-006-1.pdf

Need to replace foils one at a time to see which one is bad and then determine why it is bad. Short?

Distance between the GEM foils are 2 mm. Distance between the last GEM foil and PCB is also 2 mm. The first GEM foil and cathode are separated by 3 mm.

Ramp Up = 2 Volts/sec.

Can go up to [math]V_{Drift} = 3850[/math] Volts without even one spark and [math]V_{GEM} = 3550[/math] Volts.

[math]V_{Drift} = 3900[/math] Volts and [math]V_{GEM} = 3600[/math] Volts.

11-25-08

1.) One GEM foil is bad.

2.) Second GEM foil works:

High Voltage on Drift was 3800Volts and on GEM 3500 Volts.

proof:

3.) Third GEM foil works:

High Voltage on Drift was 3800Volts and on GEM 3500 Volts(Sparks).

proof:

I see spots on the above "working" GEM foils.  Let's leave them out and keep the three new ones in.
 
DONE

Why is the "1" GEM foil not working?

Do not know yet.

Testing DC

HV Settings:

HV settings
Wire	Volts
Sense	1700
Field	-850
Guard	850

Gas type: ArCO2 (90/10).

Below are shown the scope images of the signal from the DC(direct output from the sense wires):

Metalica

Plastika

Need UVA 122B Signal Splitter

PreAmp should be set to 6.5 Volts, otherwise we get the ring(noise level is high).

PreAmp, Chamber Amp && VPIPostAmp

Gas type: ArCO2 (90/10).
The voltage on PreAmp is set to 6.5 Volts.
HV Settings:

HV settings
Wire	Volts
Sense	1500
Field	-750
Guard	750

The signal outputs from the PreAmp and ChamberAmp compared for Metalica && Plastika.

The signal outputs and noise level from the PreAmp and VPIPostAmp(TDC output) compared for Metalica && Plastika.

GEM 29-11-08

The strip output signal is used as a trigger and as a pulse too. Gas type ArCO2 (90/10).

HV Settings: [math]V_{Drift} = 3550[/math] Volts and [math]V_{GEM} = 3250[/math] Volts.

Data: r564 and r571.

CAEN V775 TDC

From the results shown below one can make conclusions that the time interval between the end of the pulses effects the data.

The table below shows the TDC measurement made using the Stanford pulse generator to generate 2 ECL input pulses. The first pulse is defined to rise at point "A" in time and fall at point "B" in time. The second pulse rises at point "C" in time and falls at point "B" in time. Comparing the time intervals between the pulses to the TDC output indicates that the TDC measures the time interval [math]\Delta[/math] BD.

A	B	C	D	TDC	[math]\Delta[/math] AC	[math]\Delta[/math] AD	[math]\Delta[/math] BC	[math]\Delta[/math] BD
0	60	150	200	2526	150	200	90	140
0	90	150	200	1942	150	200	60	110
0	90	150	230	2504	150	230	60	140
30	60	150	200	1927	120	170	90	140
30	60	130	200	2501	100	170	70	140

First case

A=T+0

B=A+60ns

C=T+150ns

D=T+200ns

-> c775Reset     
value = 0 = 0x0
-> c775Status(0) 
STATUS for TDC id 0 at base address 0x90610000 
---------------------------------------------- 
Interrupts Disabled
Last Interrupt Count    : 0 

            --1--  --2--
 S-> c775Reset     
value = 0 = 0x0
-> c775Status(0) 
STATUS for TDC id 0 at base address 0x90610000 
---------------------------------------------- 
 Interrupts Disabled
 Last Interrupt Count    : 0 

            --1--  --2--
  Status  = 0x0053 0x0000  (Data Ready)
  BitSet  = 0x0000 0x4880
  Control = 0x0000
  FSR     = 440 nsec
  Event Count     = 1
  Last Event Read = (No Events Read)
 value = 37 = 0x25 = '%'
-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa000100   nWords = 1 
     0xf80249de
 Trailer: 0xfc000000   Event Count = 0 
value = 3 = 0x3
->

TDC bits 100111011110 b = 2526 d

Second case

A=T+0

B=A+90ns

C=T+150ns

D=T+200ns

-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa000100   nWords = 1 
     0xf8024796
 Trailer: 0xfc000003   Event Count = 3 
value = 3 = 0x3
-> c775Status(0) 
STATUS for TDC id 0 at base address 0x90610000 
---------------------------------------------- 
Interrupts Disabled
Last Interrupt Count    : 0 

            --1--  --2--
 Status  = 0x005f 0x0004  (Buffer Full)
 BitSet  = 0x0000 0x4880
 Control = 0x0000
 FSR     = 440 nsec
 Event Count     = 217
 Last Event Read = 3
value = 22 = 0x16
-> 

The TDC Bits 011110010110 b = 1942 d

Third case

A=T+0

B=A+90ns

C=T+150ns

D=T+230ns

-> c775Status(0) 
STATUS for TDC id 0 at base address 0x90610000 
---------------------------------------------- 
Interrupts Disabled
Last Interrupt Count    : 0 

            --1--  --2--
 Status  = 0x0053 0x0000  (Data Ready)
 BitSet  = 0x0000 0x4880
 Control = 0x0000
 FSR     = 440 nsec
 Event Count     = 5
 Last Event Read = (No Events Read)
value = 37 = 0x25 = '%'
-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa000100   nWords = 1 
     0xf80249c8
 Trailer: 0xfc000000   Event Count = 0 
value = 3 = 0x3
-> 

TDC bits 100111001000 b = 2504 d

Fourth case

A=T+30ns

B=A+60ns

C=T+150ns

D=T+200ns

-> c775Status(0)
STATUS for TDC id 0 at base address 0x90610000  
---------------------------------------------- 
Interrupts Disabled
Last Interrupt Count    : 0 

            --1--  --2--
 Status  = 0x0053 0x0000  (Data Ready)
 BitSet  = 0x0000 0x4880
 Control = 0x0000
 FSR     = 440 nsec
 Event Count     = 5
 Last Event Read = (No Events Read)
value = 37 = 0x25 = '%'
-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa000100   nWords = 1 
     0xf8014787
 Trailer: 0xfc000003   Event Count = 3 
value = 3 = 0x3
-> 

TDC : 011110000111 b = 1927 d

Fifth case

A=T+30ns

B=A+60ns

C=T+130ns

D=T+200ns

-> c775Status(0) 
STATUS for TDC id 0 at base address 0x90610000 
---------------------------------------------- 
Interrupts Disabled
Last Interrupt Count    : 0 

            --1--  --2--
 Status  = 0x0053 0x0000  (Data Ready)
 BitSet  = 0x0000 0x4880
 Control = 0x0000
 FSR     = 440 nsec
 Event Count     = 3
 Last Event Read = 0
value = 22 = 0x16
-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa000100   nWords = 1 
     0xf80149c5
 Trailer: 0xfc000000   Event Count = 0 
value = 3 = 0x3
-> 

TDC bits 100111000101 b = 2501 d

TDC AND DC

-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa000200   nWords = 2 
     0xf80040e8  0xf80f415f
  Trailer: 0xfc000004   Event Count = 4 
value = 4 = 0x4

Checking PMT

-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa001000   nWords = 16 
     0xf8004252  0xf80140e9  0xf80240d3  0xf80340e5  0xf80440e5
     0xf80540f4  0xf80640ef  0xf807418a  0xf8084195  0xf80942d9
     0xf80a418b  0xf80b4184  0xf80c4140  0xf80d413d  0xf80e4152
     0xf80f414d
 Trailer: 0xfc000000   Event Count = 0 
value = 18 = 0x12
-> c775PrintEvent
 TDC DATA for Module 0
 Header: 0xfa001000   nWords = 16 
     0xf8004214  0xf8014172  0xf802415a  0xf80340af  0xf804416e
     0xf805417a  0xf806424a  0xf80740b5  0xf80841a5  0xf809419a
     0xf80a40b9  0xf80b4195  0xf80c418e  0xf80d40b2  0xf80e4193
     0xf80f4184
 Trailer: 0xfc000001   Event Count = 1 
value = 18 = 0x12

1/29/09

Checking TDC

Sense Wire	Run Number
# 1	r722
#2	r723

1/30/09

1.) decrease DC HV well below 1000 Volts

2.) unplug postamp outputs and do a channel by channel test of DAQ DC ADC and TDC readout

3.) calculate gas consumption rate Liters/hr

The Volume of 1 mole of an Ideal gas

24.47 litres (24.47L) at S.L.C
[Standard Laboratory Conditions, 25oC (298K) and 101.3kPa (1atm)]

Amount of ArCO2 in Liters[math]= \frac{18000kPa}{101.3kPa} \times 24.47 L = 4348.075025 L[/math]

[math]Rate=\frac{4348.075025L}{336 hours} = 12.9407 \frac{L}{hr}[/math]

4.)Develop apparatus to measure gas chamber leaks.

Media:chamber_leak_cert.pdf

File:Chamber leak rate measurement 2002 03 13.pdf

5.) Enter Calorimeter cuts used for electron and pion cuts into wiki and put link to them in the Teleconference wiki area

6.) Prepare next items for EG1 teleconference : E/P graphs for electron and pions before and after cuts, try to use all of the data we use for asymemtries. Also put in table estimating number of events we expect after cuts.

2/6/09

1.) Plateau DC using singles counting

2.) Take picture of chamber and upload into wiki, Prep Qweak chamber for testing

shopping list for Norco: Gas flow valve, copper lines, shutoff valve, something to go from copper line to quick connect on Qweak chamber (compression fitting.

3.) write up procedure and part list to leak test CLAS12 R1 drift chambers

4.) pions

NPE -vs- EC/p for e- with cuts?

5.) Estimate of pion contamination

6.) difference W-spectrum for each run number add link to wiki location for teleconference.

7.) recheck the sign of all polarization for plots of semi-inclusive spectrum: a.) h>0 Pt>0 b.) h > 0 pt<0 c.)h<0 pt>0 d.)h<0 pt<0

2-06-09

Real Signal From DCs

Using Drift Chambers

The scope images below describe the crosstalk which exists in the UVA splitter and the VPI postamp. For both DCs only Sense Wire 4 is used. The high voltage on Plastika is turned Off and Metalica's HV is set to (1425:-700:990). The PreAmp is set to 6.4 Volts and hooked up on both detectors. We are able to minimize the cross talk by maximizing the distance between the connector pins used to transport the sense wire #4 signal from the 2 DC to the DAQ.

The output signal from the DCs after PreAmp are sent to the UVA 122B Signal Splitter on channel # 8 an 9 for Metalica and Plastika respectevily. The scope image below shows that approximately 1/30 of Metalicas output signal appears on Plastika's channel, as a result of the two channels being next to each other.

The UVA 122B Signal Splitter used as a fan-in fan-out for Metalica and Plastika output signals.

Cross talk between channel 8 & 9 on the UVA 122B signal splitter. Metalicas output is sent on channel 8 and Plastica's output sent on channel 9. Even though Plastica's HV is off (preamp ON), about 1/30 of Metalicas output signal will appear on Plastica's as a result of occupying nearby channel in the UVA 122B splitter.

In order to decrease interference from occupying nearby channels in the UVA 122B signal splitter, the pulse output from the detectors are sent to the channel number 2 for Metalica and channel # 15 for Plastika. The cross talk caused by the UVA 122B signal splitter is far less then in first case, which was described above.

The UVA 122B Signal Splitter used as fan-in fan-out for Metalica and Plastika output signals

The cross talk on the UVA 122B splitter is far less when the 2 input signals occupy different ends of the connect.

The output signals from the UVA 122B signal splitter from channels 8 and 9 of Metlica and Plastika are sent through channels 10 and 9 of the VPI post amp. 1/4 of the signal from Metalica appears on channel 9, which is TDC output for Plastika. This kind of signal, which actually comes from the Metalica, can be misidentified as a real pulse from the Plastika.

The VPI Post Amp. The sense wire # 4 for Plastika and Metalica are sent through the VPI Post Amp channels 9 and 10 respectively.

Cross talk between VPI post amp channels 9 & 10. The middle sense wire (#4) from each DC is sent through a postamp. Although Plastika's HV is off 1/4 of the signal from Metalica sent through channel 10 of the VPI post amp will appear on channel 9 of the post amp. The cross talk amplitude of 340 mV excedes the detectors noise level of 20 mv possible being labeled as a hit if the descriminator is not set to account for this.

Sense wire # 4 for Metalica and Plastika from the UVA 122B signa splitter channel numbers 2 and 15 are sent to the VPI post amp channels 16 and 3. One can see on the scope picture that the cross talk between the two detectors decreased considerably.

The VPI Post Amp. The sense wire # 4 for Plastika and Metalica are sent through the VPI Post Amp channels 3 and 16 respectively in order to decrease the cross talk.

moving wire 4 inputs to opposite sides of the UVA 122B splitter connector and on channel numbers of VPI post Amp decrease the cross talk considerably. || The sense wire # 4 for Plastika and Metalica are sent first through the UVA 122B Signal splitter and than are connected to the VPI Post Amp channels 9 and 10 respectively. 1/10 of the signal coming from the Metlica appears on the Plastika VPI output

Using The Stanford Pulse Generator

The Stanford Pulse Generator output pulse is going through the VPI PostAmp without using the UVA 122B Signal Splitter. The gain on the VPI PostAmp is set to maximum. Three channel outputs are observed on the scope. The signal is connected to channel # 15 on VPI PostAmp(the first scope image in the tabla below). The neighboring channels 14 and 16 are also shown below.

Gain settings

Channel # 14 - X3; channel # 15 - X10; channel # 16 - x10.

The VPI PostAmp signal output without using the UVA 122B Signal Splitter

The output pulse is connected to the channel # 15 of the VPI PostAmp and on the neighboring ch # 14 only ~1/250 appears(which is just a noise)

The output pulse is connected to the channel # 15 of the VPI PostAmp and on the neighboring ch # 16 only ~1/125 appears(which is just a noise again(i think))

The generated signal from the Stanford Pulse Generator is sent through the UVA 122B Signal Splitter and than is connected to the VPI PostAmp channel # 15. Below scope images show the cross-talk caused by using the UVA 122B signal splitter. When the gain of the neighboring ch #(14) is set to X3 1/50 of the signal appears on it, in other case when it is set to X10 - 1/10 of the pulse appears on the channel(16) output

The VPI PostAmp signal output using the UVA 122B Signal Splitter on Ch# 15

The VPI PostAmp signal output on channel # 14. 1/50 of the signal from the channel # 15 appears on neighboring channel # 14.

The VPI PostAmp signal output on channel # 16. 1/10 of the signal from the channel # 15 appears on neighboring channel # 16.

CONCLUSION

In order to run DCs without having the cross-talk problem we should not use the UVA 122B Signal Splitter.

Noise Problem on DCs

The output from DCs goes through the UVA 122B Signal Splitter and after is connected to the VPI PostAmp. The noise level for both chambers is measured and shown below on scope pictures before and after change using the grounded strip.

In this case, the output from the Metalica is connected directly to the VPI PostAmp. The noise level for minimum and maximum gains are shown below:

After connecting the grounded strip to the PreAmp box, the noise level was reduced.

The VPI PostAmp, PreAmp box are both grounded. My noise level is "perfect":

DCs

On Both chambers, Metalica and Plastika, the high voltage is applied(Settings S:F:G=1300:-650:910). The PreAmp is set to 6.4 Volts. The ArCO2(90/10) gas is flowing through the chambers. Metalika is placed between the two PMTs(only blue long PMTs are used). The cosmic coincidence event from the two PMTs is set as a trigger, ADC gate and start for the TDC.

Below on the scope picture are shown two pulses, coming out from the sense wire 1(ch 3) and 4 (ch 1) after going through the VPI PostAmp in gate. Gate width on image is approximately 400 ns. I thought it was narrow so i changed it to ~ 500 ns.

1200

HV settings on Metalica S:F:G=1200:-600:840

Below is shown the noise level and typical pulse at this voltage.

1150

HV settings on Metalica S:F:G=1150:-575:805

Below is shown the noise level and "pulse" caused by noise which is misidentified as a real pulse.

1100

HV settings on Metalica S:F:G=1100:-550:770

Below is shown the noise level and "pulse" caused by noise which is misidentified as a real pulse.

1.) HV Metalica 1300 Volts

Run number r751.dat

Strat: Mar 12 15:49:03

End: Mar 13 13:07:42

2.) HV Metalica 1300 Volts (only sense wire 4 in TDC)

Run number r754.dat

Strat: Mar 13 14:28:39

End: Mar 13 21:35:55

3.) HV Metalica 1300 Volts (only sense wire 4 and 1 in TDC)

Run number r755.dat

Strat: Mar 13 21:50:32

End: Mar 15 16:27:37

For 1, 2 and 3 runs discr. threshold is the same

4.) HV Metalica 1300 Volts (only sense wire 4 and 1 in TDC)

r756

Threshold doubled on Metalica

Start: mar 15 16:36:56

End: Mar 16 12:11:07

5.) HV Metalica 1200 Volts (only sense wire 4 and 1 in TDC)

r756

Threshold doubled on Metalica

Start: mar 16 12:14:30

End: Mar 17 08:30:11

5.) HV Metalica 1350 Volts

r772

Start: mar 17 13:01:27

End: Mar 17 16:47:58

5.) HV Metalica 1350 Volts (m4 and p4)

r775

Start: mar 17 19:47:57

End: Mar 18 10:38:07

Chamber Leak Rate Measurements

Media:TDC_V775.pdf

List of devices needed to measure chamber leaks

• 1). The gas flow micro-calibrator (of the leak measuring device) Media:Microcalibrator_for_DC.pdf .

• 2). The Leak Measuring Device (LMD).

• 3). The Weather Monitoring Device(to measure the barometric pressure and ambient air temperature).

Using this devices, chamber leak rate is calculated in the following way:

[math]\frac{\Delta V}{\Delta t}(cc/min) \approx V_0 \left |- \frac{2 \Delta H + \Delta B}{B_0} \right | \frac{H_{initial}}{(H_{final} + H_{initial})/2} \frac{1}{\Delta t}[/math]

where

[math]V_0[/math] is the chamber volume

[math]\Delta H = H_{final} - H_{initial}[/math] is the change in the chamber overpressure

[math]\Delta B = B_{final} - B_{initial}[/math] is the change in the atmospheric(barometric) pressure

[math]\Delta t[/math] is the time between the final and initial measurements of the overpressure(recommended time interval is ~ 24 hours)

In other paper, for the chamber gas leak measurements a mass spectrometer was used

Qweak GEM Foil

Testing Qweak GEM Detector

The cathode was taken out from the chamber, and only GEM foils were tested. On GEM i went up to 3500 volts, without seeing any "sparks".

2/20/09

1.) VPI post amp cross talk measurement

Need to get rid of UVA splitter. Lets make a cable to connect 2 DC into 1 VPI input connector

2.) Do Inclusive Histograms and then do helicity difference histograms

3.) Change Qweak bottom foil, connector from Walter coming soon will use to terminate detector output

4.) Continue Plateau measurements, prepare plateau measurement run plan for April.

03-04-09

Drift Velocity Calculation

HV Settings S:F:G=1350:-675:945

Cell size d=0.86 cm

[math]\Delta V = 1350 + 675 = 2025 Volts[/math]

[math]E = \frac{\Delta V}{d} = \frac{2025 Volts }{0.86 cm} \frac{100 cm}{m} = 235465\frac{Volts}{m}[/math]

F = q E = ma

[math]a = \frac{q E}{m} = \frac{1.602 \times 10^{-19} C \times 235465 Volts/m \times c^2 }{0.511 \times 10 ^6 \times 1 Volt \times 1.602 \times 10^{-19} C } = 4.1 \times 10^{16} \frac{m}{s^2} [/math]

Data From DC Metalica

The drift velocity for electrons in drift chambers is ~ [math]50 \mu m/ns[/math]. Media:mestayer.pdf

Calculated result using TDC data

The size of the drift chamber cell is 0.86 cm.

[math] t_{Drift} = \frac{1000 {\rm ns}}{2^{12}{\rm chan}} \times 568.4 {\rm chan} = 138.7695 ns [/math]

[math]v_{Drift}[/math] = [math]\frac{0.86 cm}{138.7695 ns}[/math] = 61 [math]\mu m/ns[/math] = 6.1 cm/ [math]\mu[/math] s

Agrees with theoretical result.

TDC and ADC measurements for Sense Wire 4

TDC and ADC measurements for Sense Wire 1

Using only bottom scintillator(TDC data)

1)start

Mar 26 13:22:30

Stop: Mar 30 11:03:41

Run number r860

Only bottom Scintillator used.

Sense Wire 1

Sense Wire 4

SIS3610 Module

The rise of the TTL pulse into the PLX board should exceed (begin later in time) the rise SIS3610 NIM input trigger pulse in order to latch the PLX LVDS input signals sent the the SIS3610 data input connector.

1.)

A=T+0.000033500200

B=A-0.000033100200

C=T+0.000000333000

D=T+0.000034000000

The pulse on the SIS3610 appeared after the time delay which is shown on the scope below.

2.) A=T+0.000033500200

B=A-0.000033100200

C=T+0.000000333000

D=T+1.000034000000(one can go as high as he wants, you still have an input)

I mean increase the time interval between the pulse ends.

3.) The input data bits are not latched if the PLX rises befor the SIS3610 input TTL triger pulse

A=T+0.000033500200

B=A-0.000033100200

C=T+0.000000330000

D=T+0.000034000000

No pulse in the SIS3610 Module.

4/2/09 Qweak Detector Working

The scope pictures below shows the GEM chamber's "TrigOut" pulse caused by a cosmic ionization event in the Qweak R1 detector. The "TrigOut" pulse represents electrons leaving the last GEM preamplifier stage and is therefore a positive going pulse. The high voltage was set to -3400 Volts on the cathode [math](V_{Drift})[/math] and -3100 Volts on the GEM foil voltage divider network [math](V_{GEMFoil})[/math] which powers all three GEM foil amplifier stages. The chamber was filled with a gas mixture composed of 90% Argon and 10% Co2 by volume. Both scope images represent the same pulses but viewed with different time scale. On the first image the time scale is set to 100 ns and on the other one - 40 ns.

Several scope pictures were taken of the trigOut pulse for different high voltages, in order to show the pulse amplitude dependence on the HV.(As the high voltage goes up, the gain of the TrigOut signal on the Qweak detector increases)

HV Drift:GEMFoil=-3300:-3000

HV Drift:GEMFoil=-3350:-3050

The trig out signal below goes away when Vdrift = VGEM=3050

HV Drift:GEMFoil=-3400:-3100

HV Drift:GEMFoil=-3450:-3150

HV Drift:GEMFoil=-3500:-3200

At 3500 Volts there are some sparks, so i didnt go on higher voltages.

Qweak Drift/GEM HV (Volts)	Pulse amplitude	Noise level
3300/3000	17.0 mV [math]\pm[/math] 4.79 mV	6.9 mV [math]\pm[/math] 934 [math]\mu V[/math]
3350/3050	17.0 mV [math]\pm[/math] 12.5 mV	6.9 mV [math]\pm[/math] 1.15
3400/3100	~20 mV [math]\pm[/math] 13.2 mV	7.2 mV [math]\pm[/math] 886 [math]\mu[/math]V
3450/3150	28.2 mV [math]\pm[/math] 13.0 mV	7.52 mV [math]\pm[/math] 1.42 mV
3500/3200	38.2 mV [math]\pm[/math] 12.4 mV	7.7 mV [math]\pm[/math] 1.11 mV

ADC Measurements For Qweak Detector

The charge from the chamber's "TrigOut" pulse was measured using a CAEN 775 charge sensing ADC. The "TrigOut" pulse was sent to an amplifier with 2 outputs. One output was sent to a discriminator to generate a trigger pulse and an ADC gate. The other output was delayed XXX ns and injected into channel YY of the CAEN ADC.

HV Settings [math]V_{Drift}:V_{GEMFoil} =[/math]

Electronics Settings:

HRRL 4-13-09

1.)

Type of Detector	SHV Channel	BNC channel	HV Settings
Front Scintilator	SHV59A1	223A1	-1000 Volts
Blue Scintilator	SHV59A2	223A2	-1000 Volts

Both scintillators were checked and they work.

05-03-09

Testing GEM Detector

HV Settings [math]V_{Drift}[/math]:[math]V_{GEM}[/math]=-3500:-3200

Not even one "spark" at this voltage.

HV Settings [math]V_{Drift}[/math]:[math]V_{GEM}[/math]=-3450:-3150

HV Settings [math]V_{Drift}[/math]:[math]V_{GEM}[/math]=-3400:-3100

Experimental SetUp

StripOut from the GEM detector is used as a gate and trigger, the signal is amplified using Timing Filter Amplifier(Model 474-09) and discriminated(DIFF CFD. Model 683). TrigOut pulse from the detector is inverted and amplified(Timing filter Amplifier Model 474-06) and delayed.

HV Drift:GEM=3450:3150

05-12-2009

Plastika(Drift Chamber) works! I am not able to get signal only from Sense wire # 4 and 5. Otherwise, all other channels are working.

06-22-2009

[2]

Media:26000Model_LogarithmicPicoammeter.pdf

Phillips Scientific 710 Octal Discriminator

Trigger setup for GEM Detector

The Histogram below shows the charge collected by the last GEM foil in Qweak detector for two HV settings

07-5-2009

DC Position Measurements Hopefully

Experimental Setup

Beam parameters

100 ns(scope shows 200ns), 300 Hz and 40 mAmp.

Cables and HV Settings

DC HV Settings: Sense:Field:Guard=1400:-700:980.

HV cable channels: Sense/Field/Guard=SHV59A2/A4/A3.

Signal channel - 223A9.

Pulse is amplified and after discriminated.

PMTs

Images

BA:53:FD:A3:7D:D1

Gumstix_Verdex

manually set the IP:

ifconfig eth0 192.168.15.15 netmask 255.255.0.0

restart the networking (and force a retry for DHCP address:

/etc/init.d/networking restart

echo "p 32 0 0 set" | flipbit.arm

echo "p 32 0 1 set" | flipbit.arm

echo "e 32 1 6 on" | flipbit.arm 

echo "e 32 134 4 on" | flipbit.arm

echo "e 32 130 0xCE set" | flipbit.arm

v1495firmware(0x80110000, "GEMReadout_Rev2-2_NoPLL.rbf",0,0)

MAC ba:53:fd:a3:7d:e1

Gumstix IP address at ISU

Compiled on Feb 21 2005, 19:32:30.
Press CTRL-A Z for help on special keys
.o��ti��o.t �ter 60 �co��.
OpenEmbedded Linux gumstix-custom-verdex ttyS0
Angstrom 2007.9-test-20080512 gumstix-custom-verdex ttyS0
gumstix-custom-verdex login: 
OpenEmbedded Linux gumstix-custom-verdex ttyS0
Angstrom 2007.9-test-20080512 gumstix-custom-verdex ttyS0
gumstix-custom-verdex login: root
Password: 
Welcome to gumstix!                                                             
For information on how to customize or update this software please visit:       
http://www.gumstix.net                                                          
root@gumstix-custom-verdex:~$ root@gumstix-custom-verdex:~$ ls                                                
bin        hello.arm                                                            
root@gumstix-custom-verdex:~$ /sbin/ifconfig                                    
eth0      Link encap:Ethernet  HWaddr DE:23:D5:65:A1:10                         
         inet addr:134.50.3.175  Bcast:134.50.3.255  Mask:255.255.255.0        
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                    
         RX packets:640687 errors:0 dropped:0 overruns:0 frame:0               
         TX packets:3657 errors:0 dropped:0 overruns:0 carrier:0               
         collisions:0 txqueuelen:1000                                          
         RX bytes:57825718 (55.1 MiB)  TX bytes:380094 (371.1  KiB)                                                                                                                                
lo        Link encap:Local Loopback                                             
         inet addr:127.0.0.1  Mask:255.0.0.0                                   
         UP LOOPBACK RUNNING  MTU:16436  Metric:1                              
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0                    
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0                  
         collisions:0 txqueuelen:0                                             
         RX bytes:0 (0.0 B)  TX bytes:0 (0.0B)                                                                                                              
root@gumstix-custom-verdex:~$ 

root@134.50.3.175

interrupt: ERROR: v1495ReadEvent returned 0 words
interrupt: ERROR: v1495ReadEvent returned 0 words
interrupt: ERROR: v1495ReadEvent returned 0 words
interrupt: ERROR: v1495ReadEvent returned 0 words

12/08/2009

The Qwaek GEM detector works. HV settings:[math] V_{Drift}:V_{GEM} = -3570:-3270[/math]

CODA running

17/08/2009

Outputs	Channel Number
TOP PMT singles	1
Bottom PMT singles	3
Top + Bottom PMT coincidence	5
GEM Trig out singles	7
GEM Trig out + Top PMT coincidence	dont have
GEM Trig out + Bottom PMT coincidence	9
GEM Trigout + Top + Bottom PMT coincidence	13
Time (1 Hz)	15

Used Timing Filter Amplifier(Noise level was high, and leading edge discriminator instead of CFD)

Run #	HV=Drift/GEM Volts	TOP PMT singles (1)	Bottom PMT singles (3)	Top + Bottom PMT coincidence (5)	GEM Trig out singles (7)	GEM Trig out + Bottom PMT coincidence (9)	GEM Trigout + Top + Bottom PMT coincidence (13)	Time (1 Hz) (15)	13/5 (%)
1313	3520/3220	567251	1428373	11047	94075	520	146	79575	1.3
1315	3550/3250	139586	137090	997	1101151	195	20	6923	2.0
1316	3550/3250	896375	1347216	11098	79905	536	171	76232	1.5
1317	3575/3275	558724	875863	6486	70651	439	131	45558	2.0
1318	3525/3225	429067	822762	6419	38107	186	57	42917	0.9
1319	3600/3300	1445938	3544955	27578	440996	2049	676	183089	2.5
1320	3600/3300	618683	1616819	11867	192341	789	269	76243	2.3

Using Chamber Output Amplifier with Phillips Gain amplifier(for GEM TrigOut) and amplified is discriminated with CFD.

The GEM detector "Trig Out" signal is sent to the custom post amplifier used by the CLAS Drift chambers and then sent to an Leading Edge Discriminator. The discriminator is set to 50 mV

Run #	HV=Drift/GEM Volts	TOP PMT singles (1)	Bottom PMT singles (3)	Top + Bottom PMT coincidence (5)	GEM Trig out singles (7)	GEM Trig out + Bottom PMT coincidence (9)	GEM Trigout + Top + Bottom PMT coincidence (13)	Time (1 Hz) (15)	13/5 (%)
1322	3640/3340	324596	472633	3059	25632	66	54	22797

Ethane

Ethane Properties Noncorrosive

[math]Rate=\frac{4348.075025L}{180 days} = 24.16\frac{L}{days}[/math]

"At room temperature, ethane is a flammable gas. When mixed with air at 3.0% – 12.5% by volume, it forms an explosive mixture." Ethane

Corrosion Resistance Tables for Ethane

Parker 7121 welding hose, Grade R

EPDM rubber (ethylene propylene diene Monomer (M-class) rubber) - Unsatisfactory.

GEM Foils mounted on the frame

Media:vfat16_jlab_working_one.html

Shopping List For Dr. Forest

[3] - 10

[4] - 10

[5] - 3

[6] - 200

[7] - 200

[8] - 200

[9]

NIM BIN Modules

Dual Timer From CAEN

2 Channel 15 kV Programmable Power Supply

• Possible ones

Gate and Delay Generator

NIM Dual Delay

DC efficiency

DC HV on Sense Wire	TOP PMT singles (1)	Bottom PMT singles (3)	Top + Bottom PMT coincidence (5)	DC Singles (15)	DC + Top PMT + Bottom PMT (16)	16/5 %
1450 Volts	675516	987316	4054	162777	202	4.9
1450 Volts	1190056	1052420	4397	331472	227

A GEM HV of 3600/330 may give the same rate as 
Baby chambers set to 1450 Volts on the sense wire.

Replacing HV board on GEM

I took apart GEM detecter and replaced the HV board.

HV Board on GEM detector is replaced and it works:

HV Settings are following: [math]V_{Drift}:V_{GEM}=-3500:-3200[/math]

HV Settings are following: [math]V_{Drift}:V_{GEM}=-3450:-3150[/math]

[math]V_{Drift}:V_{GEM}=-3450:-3150[/math] && [math]V_{DCSenseWire}=1400[/math]

  Scaler Data :                                                                
SCAL01:     312024  SCAL02:          0  SCAL03:    2020395  SCAL04:          0 
SCAL05:       2875  SCAL06:          0  SCAL07:      40363  SCAL08:          0 
SCAL09:         46  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:         24  SCAL14:          0  SCAL15:     194288  SCAL16:        144 

value = 0 = 0x0

[math]V_{Drift}:V_{GEM}=-3500:-3200[/math] && [math]V_{DCSenseWire}=1400[/math]

  Scaler Data :                                                                
SCAL01:      17984  SCAL02:          0  SCAL03:     123457  SCAL04:          0 
SCAL05:        214  SCAL06:          0  SCAL07:     273805  SCAL08:          0 
SCAL09:         40  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:         29  SCAL14:          0  SCAL15:      14105  SCAL16:         32 
value = 0 = 0x0                                                                 

  Scaler Data :
SCAL01:      45510  SCAL02:          0  SCAL03:     326892  SCAL04:          0 
SCAL05:        505  SCAL06:          0  SCAL07:     303950  SCAL08:          0 
SCAL09:         67  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:         49  SCAL14:          0  SCAL15:      38497  SCAL16:         62 
value = 0 = 0x0

  Scaler Data :
SCAL01:     644627  SCAL02:          0  SCAL03:    4781886  SCAL04:          0 
SCAL05:       6469  SCAL06:          0  SCAL07:    1641122  SCAL08:          0 
SCAL09:        593  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:        441  SCAL14:          0  SCAL15:     585088  SCAL16:        706 

value = 0 = 0x0

  Scaler Data :
SCAL01:      16886  SCAL02:          0  SCAL03:     121292  SCAL04:          0 
SCAL05:        183  SCAL06:          0  SCAL07:       3100  SCAL08:          0 
SCAL09:         45  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:         45  SCAL14:          0  SCAL15:      14959  SCAL16:         51 

value = 0 = 0x0

  Scaler Data :
SCAL01:      25408  SCAL02:          0  SCAL03:     186425  SCAL04:          0 
SCAL05:        320  SCAL06:          0  SCAL07:       4943  SCAL08:          0 
SCAL09:        102  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:        102  SCAL14:          0  SCAL15:      22765  SCAL16:        111 

value = 0 = 0x0

Efficiency of GEM Detector and Drift Chamber, Experimental SetUp

[[File:GEM_TwoPMTs_DC_28-09-09_5.jpg|250px]

Media:GEML6-10-09.pdf

Sh

1. Xorg configuration created by pyxf86config

Section "ServerLayout" Identifier "Default Layout" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" EndSection

Section "InputDevice" Identifier "Keyboard0" Driver "kbd" Option "XkbModel" "pc105" Option "XkbLayout" "us" EndSection

Section "Device" Identifier "Videocard0" Driver "vesa" EndSection

Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection

Qweak_R1_A GEM Detector works

[math]V_{Drift}:V_{GEM}=-3300:-3000 Volts[/math]

10/9/09

scal01 scal 05

  Scaler Data :                                                                
SCAL01:      37413  SCAL02:          0  SCAL03:     306915  SCAL04:          0 
SCAL05:        381  SCAL06:          0  SCAL07:      15791  SCAL08:          0 
SCAL09:         99  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:         70  SCAL14:          0  SCAL15:     176561  SCAL16:        144 

value = 0 = 0x0 -

Lab stuff

[10]

TDC Measurements

Run number: r1351.dat

Start: Nov 2, 14:13:10 Stop: Nov 16, 10:12:14

Channel #	Detector type	TDC Histograms_1	TDC Histograms_2 (TDC2>500)
2	Bottom Scintillator
3	Top DC(Plastika)
4	Bottom DC(Metalica)
5	Qweak GEM Detector

Electronics+TimeShift=180ns

[11]

11/6/09

11/20/09

1

New TDC runs with changed Discriminator thresholds

DC-60 mV

GEM-100mV

GEM HV - 3500/3200 Volts

Run number r1353

Start: Nov 18 15:42:29

Stop: Nov 23 13:54:08

Channel #	Detector type	TDC Histograms_1	TDC Histograms_2 (zoomed in)
2	Bottom Scintillator
3	Top DC(Plastika)
4	Bottom DC(Metalica)
5	Qweak GEM Detector

[math]\frac{Qweak GEM Detector}{Bottom DC(Metalica)} = 95.5 %[/math]

[math]\frac{Bottom Scintillator}{TOP DC(Plastika)} = 100 %[/math]

[math]\frac{Bottom Scintillator}{Bottom DC(Metalica)} = 31 %[/math]

[math]\frac{Bottom Scintillator}{Qweak GEM Detector} = 30 %[/math]

Device	Peak - Peak noise (mV)
Plastika	76
Metalica	72
GEM 1B	136

Disciminator (mV)	Plastica Eff. (%)
40
60
80

Disciminator (mV)	Metalica Eff. (%)
40
60
80

Disciminator (mV)	GEM Eff. (%)
70
100
140

The third channel is QweakGEM Detector.

2

Detectors swapped.

Run number r1356.dat

DC-60 mV

GEM-100mV

GEM HV - 3500/3200 Volts

Start: Nov 23 18:07:21

Stop: Nov 25 15:32:45

Channel #	Detector type	TDC Histograms_1	TDC Histograms_2 (zoomed in)
2	Bottom Scintillator
4	Top DC(Metalica)
3	Bottom DC(Plastika)
5	Qweak GEM Detector

No cut on Bottom Scintillator

[math]\frac{Bottom Scintillator + Top PMT}{Bottom DC(Plastika)} = 46 %[/math]

[math]\frac{Bottom Scintillator + Top PMT}{Top DC(Metalica)} = 100 %[/math]

[math]\frac{Bottom Scintillator + Top PMT}{Qweak GEM Detector} = 29 %[/math]

Cut on Bottom Scintillator(TDC2>500)

[math]\frac{Bottom Scintillator + Top PMT}{Bottom DC(Plastika)} = 24 %[/math]

[math]\frac{Bottom Scintillator + Top PMT}{Top DC(Metalica)} = 24 %[/math]

[math]\frac{Bottom Scintillator + Top PMT}{Qweak GEM Detector} = 9 %[/math]

3

The same layout of detectors as in #2

Run number r1357.dat

DC-100 mV

GEM-140mV

GEM HV - 3500/3200 Volts

Start:

Stop:

Channel #	Detector type	TDC Histograms_1	TDC Histograms_2 (zoomed in)
2	Bottom Scintillator	200px	200px
4	Top DC(Metalica)	200px	200px
3	Bottom DC(Plastika)	200px	200px
5	Qweak GEM Detector	200px	200px

shopping list for digikey && pasternack

1.) [12] - 2 per board. (order maybe 5)

and

2.) [13]

Some other items

[14]-100 feet $28

K-K 101 A004

[15]

Number of counts in PMTs

Thresholds - 34 mV

-> v260Status(0,1)                                                              
STATUS for SCALER id 0 at base address 0x90da0000                               
--------------------------------------------------                              
 Version = 0x10dc    Module Type = 0x080d                                      
 Scalers ENABLED                                                               
                                                                               
  Scaler Data :                                                                
SCAL01:       7828  SCAL02:      24171  SCAL03:          0  SCAL04:      46106 
SCAL05:          0  SCAL06:          0  SCAL07:          0  SCAL08:          0 
SCAL09:          0  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:          0  SCAL14:          0  SCAL15:          0  SCAL16:          0 
value = 0 = 0x0                                                                 
-> 

21cm, 7cm.

[math]S_D = 147 cm^2[/math]

[math] Rate = Intensity \times S_D = \frac{0.01}{cm^2 \times sr \times sec} \times 147 cm^2 = 1.47 \frac{particles}{sec}[/math]

[math]TopPMT = \frac{24171}{7828} = 3\frac{particles}{sec}[/math]
[math] BottomPMT = \frac{46106}{7828} = 6 \frac{particles}{sec}[/math]

Both PMT's should have their gain and disc threshold set to within 25% 
of the cosmic rate.  Right now the bottom PMT is not agreeing 
with this request.  Either lower voltage or raise threshold.  
I prefer to lower Voltage and have both PMTs on same disc. threshold setting.
After the singles rate looks good compare the coincidence rate with expectations.

  Scaler Data :                                                                
SCAL01:        714  SCAL02:        580  SCAL03:          0  SCAL04:        610 
SCAL05:          0  SCAL06:          0  SCAL07:          0  SCAL08:          0 
SCAL09:          0  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:          0  SCAL14:          0  SCAL15:          0  SCAL16:          0 
value = 0 = 0x0                                                                 
-> 

  Scaler Data :                                                                
SCAL01:     171548  SCAL02:     136127  SCAL03:          0  SCAL04:     150097 
SCAL05:          0  SCAL06:        341  SCAL07:          0  SCAL08:          0 
SCAL09:          0  SCAL10:          0  SCAL11:          0  SCAL12:          0 
SCAL13:          0  SCAL14:          0  SCAL15:          0  SCAL16:          0 
value = 0 = 0x0                                                                 
-> 

Identify the channels and create table of Rate with detectors identifies as Top scint or Bottom scint.

Error In Coda 2.6

12/18/09

1.) Table of cosmic data

2.) Electron efficiencies when pi+ and pi- in same scintillator but electron in 2 different scintillators.

[16]

[math](15 ns(TDC Measurement) + 5 ns (PMT1 cable delay)) - ( 10 ns (ribbon cable going to TDC Stop(PMT2)) + 5 ns (Level Translator Model 726 for PMT2(stop))) = 5 ns (between the PMT1 and PMT2 pulses due to distance)[/math]

Distance between PMT1 and PMT2 = 4.67 ns (140 cm)

Qweak GEM HV vs Efficiency

Several runs were taken with different GEM HV.

DC-100 mV

GEM-140mV

3450/3450

run number is 1368

not enough data

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator	200px	100 %
4	Top DC(Metalica)	200px	19
3	Bottom DC(Plastika)	200px	5
5	Qweak GEM Detector	200px	1.8

3500/3200

run number is 1365

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100%
4	Top DC(Metalica)		16 %
3	Bottom DC(Plastika)		16 %
5	Qweak GEM Detector		6 %

40% [math]\pm[/math] 2%

3550/3250

• run number is 1366

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		5 %
3	Bottom DC(Plastika)		11 %
5	Qweak GEM Detector		6 %

• run number 1377

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6 %
3	Bottom DC(Plastika)		16 %
5	Qweak GEM Detector		10%

68% [math]\pm[/math] 4%

3555/3255

• run number is 1373

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6 %
3	Bottom DC(Plastika)		14 %
5	Qweak GEM Detector		10 %

• run number 1381 && 1382

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6.6%
3	Bottom DC(Plastika)		15 %
5	Qweak GEM Detector		10 %

3560/3260

• run number is 1370

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		6%
3	Bottom DC(Plastika)		14%
5	Qweak GEM Detector		17 %

• run number is 1378

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		7%
3	Bottom DC(Plastika)		16%
5	Qweak GEM Detector		14 %

3575/3275

• run number is 1369

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		4 %
3	Bottom DC(Plastika)		15 %
5	Qweak GEM Detector		17 %

• run number 1379

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		5 %
3	Bottom DC(Plastika)		18 %
5	Qweak GEM Detector		20 %

3580/3280

run number is 1371

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		12 %
3	Bottom DC(Plastika)		5 %
5	Qweak GEM Detector		21 %

3590/3290

run number is 1374

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)		18 %
3	Bottom DC(Plastika)		6 %
5	Qweak GEM Detector		30 %

3600/3300

run number is 1367

Channel #	Detector type	TDC Histograms BottomScTDC>500	TDC#/TDC2 [math]\times 100 %[/math]
2	Bottom Scintillator		100 %
4	Top DC(Metalica)	200px
3	Bottom DC(Plastika)	200px
5	Qweak GEM Detector		100 %

Cosmics Coincidence Rate for Different Runs

GEM Drift Voltage (Volts)	Coincidence Rate between the two PMTs # Counts/hr	Coincidence Rate between the two PMTs # Counts/hr
3500	4 [math]\pm[/math] 0.025
3550	2 [math]\pm[/math] 0.06	4
3555	4 [math]\pm[/math] 0.1	4
3560	4 [math]\pm[/math] 0.06	5
3575	3 [math]\pm[/math] 0.07	4
3580	4 [math]\pm[/math] 0.1
3590	3 [math]\pm[/math] 0.13
3600	4.7 [math]\pm[/math] 0.13

Average rate is [math]3.7 \pm 0.82[/math] counts/hr

GEM Efficiency

GEM [math]V_{Drift}[/math] Voltage (Volts)	GEM Efficiency %
3550	47.25 [math]\pm[/math] 6.05
3555	60 [math]\pm[/math] 4
3560	83 [math]\pm[/math] 13
3575	95.25 [math]\pm[/math] 3.45

JLAB Gumstix

# ls                                                                            
VFAT             echo             i2c              rs                           
a                flipbittest.arm  jhlee            uisp                         
bin              hello            ledmul                                        
bin.tgz          hellop           newfile                                       
# ifconfig                                                                      
eth0      Link encap:Ethernet  HWaddr BA:53:FD:A3:7D:D1                         
         inet addr:134.50.203.197  Bcast:134.50.203.255  Mask:255.255.255.0    
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                    
         RX packets:1592 errors:0 dropped:0 overruns:0 frame:0                 
         TX packets:18 errors:0 dropped:0 overruns:0 carrier:0                 
         collisions:0 txqueuelen:1000                                          
         RX bytes:150374 (146.8 KiB)  TX bytes:6187 (6.0 KiB)                  
         Interrupt:59 Base address:0xf300 DMA chan:8                           
                                                                               
lo        Link encap:Local Loopback                                             
         inet addr:127.0.0.1  Mask:255.0.0.0                                   
         UP LOOPBACK RUNNING  MTU:16436  Metric:1                              
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0                    
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0                  
         collisions:0 txqueuelen:0                                             
         RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)                                
                                                                               
usb0      Link encap:Ethernet  HWaddr BA:53:FD:A3:7D:E1                         
         inet addr:10.10.0.1  Bcast:0.0.0.0  Mask:255.0.0.0                    
         UP BROADCAST MULTICAST  MTU:1500  Metric:1                            
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0                    
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0                  
         collisions:0 txqueuelen:1000                                          
         RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)     

So I2C works!!!(you can see chip ID)

1/15/10

GEM efficiency will be ratio of GEM rate to DC rate.

File:Efficiency of detectors PMTCoincidenceRate 23-01-2010.txt

File:Efficiency of GEM to respect of DC Rate 23-01-2010.txt

2/8/10

1.) Finish changes to Ph.D. Proposal. Schedule presentation for some time after March 29.

2.) Pi^+ plots for NH3 to show efficiency as function X bj. Then try other paddles

3.) Look up count rate in CLAS data base

4.) Put Gumstix + power supply into NIM module

• 1.) Parts to Order

[17] - 1 inch

[18]

[19]

[20] - 1 inch

[21]

• 2.)

[22]

[23]

2/17/10

1.) Finish changes to Ph.D. Proposal. Schedule presentation for some time after March 29.

  Done.  Schedule time for proposal defense.

2.) Pi^+ plots for NH3 to show efficiency as function X bj. Then try other paddles

Using NH3 data [math]\pi^+[/math] appears to be have the same rate in paddle 27 when B>0 and paddle 7 when B < 0. The electron hits paddle 7 when B >0 and paddle 11 when B<0.

[math]X_{bj}[/math] bin	Ratio of B>0 to B<0
0.1	2.38 [math]\pm[/math] 0.299
0.2	1.29 [math]\pm[/math] 0.188
0.3	1.38 [math]\pm[/math] 0.242
0.4	1.62 [math]\pm[/math] 1.02

Now insert 2 CED pictures of one event with B<0 and one event with B>0. Indicate momentum (P,theta,Phi) of all particles.

Now try other paddles.

ND3 does not appear to have equal rates of [math]\pi_-[/math] events under similar conditions.

3.) Look up count rate in CLAS data base

http://wwwkph.kph.uni-mainz.de/MAID//

4.) Put Gumstix + power supply into NIM module

Designed, parts colledted, ready to assemble.

To Do List

1.) Pions

2.) Cable in HRRL (Tomorrow 10 am)

3.) Cathode 50um for Qweak GEM

[24]

[25] Media:ACclad_H-73247-3.pdf

4.)Scope: Utility [math]\rightarrow[/math] Utility Page [math]\rightarrow[/math] Calibration [math]\rightarrow[/math] Signal Path (pass) [math]\rightarrow[/math] [math]\rightarrow[/math] Signal Path Failed

5.) SHV input/output - 8, BNC - 12.(Beam Lab).

6.) Conn PLUG BNC RG59 Twist CRMP AU

[26]

[27]

5.) List of Things to Take to JLAB

• GEM Foils;

• Screwdrivers;

• White Paper;

• Soldering Iron;

• Solder;

• Voltmeter;

• Kapton Tape;

Vfat

short is defined as ZERO.

A-16

B- 48

C - 80 (changed to 101 (it was 001))

D - ?

E - 96

F - 112

Prep For HRRL Run

Trans comp IP address: 134.50.203.18

• Gumstix_1 IP address

~ >ssh root@134.50.3.175 root@134.50.3.175's password:

• Gumstix_2 IP address

root@gumstix-custom-verdex:~$ /sbin/ifconfig 
eth0      Link encap:Ethernet  HWaddr 00:15:C9:0F:99:90  
         inet addr:134.50.203.88  Bcast:134.50.203.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:328 errors:0 dropped:0 overruns:0 frame:0
         TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000 
         RX bytes:30329 (29.6 KiB)  TX bytes:6344 (6.1 KiB)
         Interrupt:131 DMA chan:ff 

lo        Link encap:Local Loopback  
         inet addr:127.0.0.1  Mask:255.0.0.0
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0 
         RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@gumstix-custom-verdex:~$

HRRL RUN March-2010

TDC Channels

Detector type	TDC Channel
Front DC	4
Rear DC	5
Front PMT	7
Rear PMT	8
Qweak GEM	9

RUNs

• r1484

Beam current: 2mA.

Cable delay time is 100 ft + 6 ft + 5 ft = 111 ft (30.96 cm/ft) (1 ns/15 cm) = 229nsec

Latency = 1/MCLK = 1/40 MHz = 25 ns

229ns/25ns = 9.2 = latency value for VFAT to time in signal from the HRRL cell to the HRRL counting room

3/29/10

1.) Ph.D. Proposal submitted to review committee of Dale, Cole, Tatar, Fisher. Schedule presentation for some time after April 29.

2.) Pi^+ plots for NH3 to show efficiency as function X bj. Then try other paddles (No progress busy with HRRL run last week)

Using NH3 data [math]\pi^+[/math] appears to be have the same rate in paddle 27 when B>0 and paddle 7 when B < 0. The electron hits paddle 7 when B >0 and paddle 11 when B<0.

[math]X_{bj}[/math] bin	Ratio of B>0 to B<0
0.1	2.38 [math]\pm[/math] 0.299
0.2	1.29 [math]\pm[/math] 0.188
0.3	1.38 [math]\pm[/math] 0.242
0.4	1.62 [math]\pm[/math] 1.02

Now insert 2 CED pictures of one event with B<0 and one event with B>0. Indicate momentum (P,theta,Phi) of all particles.

Now try other paddles.

ND3 does not appear to have equal rates of [math]\pi_-[/math] events under similar conditions.

3.) Look up count rate in CLAS data base (busy with HRRL run last week)

http://wwwkph.kph.uni-mainz.de/MAID//

4.) Put Gumstix + power supply into NIM module

Designed, parts collected, ready to assemble.

5.) Travel to JLab April 8 return April 26, will install working Qweak detectors. Finish NIM bin, test it and take it with you. prepare shipping package with everything you need so we can ship it so it arrives before April 8.

a.) Install Power supply into VME crate.

b.) Setup Cosmics for GEM + 2 DC + 2 PMTs. GEM trig out goes into QDC and TDC. Scintillators go to QDC.

c.) restore working 10 x 10 cm GEM detector

3/31/2010

Two PMTs and Qweak GEM

GEM1 CODA configuration.

• 1) Run number r1515.dat (3550 Volts on GEM && 15 hrs)

• 2) Run Number r1517.dat (3500 Volts on GEM)

4/11/2010

Qweak Detector works at JLAB.

Couldnt use new cathode was sparking.

Scope pictures:

Voltage setting : [math]V_{Drift}:V_{GEM} = 3350:3050[/math]

4/23/2010

• 1) is at JLAB: HWaddr DE:23:D5:65:A1:10

• 1) root@gumstix-custom-verdex:~$ /sbin/ifconfig

eth0      Link encap:Ethernet  HWaddr DE:23:D5:65:A1:10                         
        inet addr:134.50.3.175  Bcast:134.50.3.255  Mask:255.255.255.0        
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                    
        RX packets:640687 errors:0 dropped:0 overruns:0 frame:0               
        TX packets:3657 errors:0 dropped:0 overruns:0 carrier:0               
        collisions:0 txqueuelen:1000                                          
        RX bytes:57825718 (55.1 MiB)  TX bytes:380094 (371.1  KiB)                                                                                                                                
lo        Link encap:Local Loopback                                             
        inet addr:127.0.0.1  Mask:255.0.0.0                                   
        UP LOOPBACK RUNNING  MTU:16436  Metric:1                              
        RX packets:0 errors:0 dropped:0 overruns:0 frame:0                    
        TX packets:0 errors:0 dropped:0 overruns:0 carrier:0                  
        collisions:0 txqueuelen:0                                             
        RX bytes:0 (0.0 B)  TX bytes:0 (0.0B)                                                                                                              
root@gumstix-custom-verdex:~$ 

• 2) root@gumstix-custom-verdex:~$ /sbin/ifconfig

eth0      Link encap:Ethernet  HWaddr 00:15:C9:0F:99:90  
         inet addr:134.50.203.88  Bcast:134.50.203.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:328 errors:0 dropped:0 overruns:0 frame:0
         TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000 
         RX bytes:30329 (29.6 KiB)  TX bytes:6344 (6.1 KiB)
         Interrupt:131 DMA chan:ff 

lo        Link encap:Local Loopback  
         inet addr:127.0.0.1  Mask:255.0.0.0
         UP LOOPBACK RUNNING  MTU:16436  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0 
         RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

root@gumstix-custom-verdex:~$

06-08-2010

Qweak position measurements

Media:QWEAK.txtMedia:GEM1R1.txt

• 1 Found

[math]X=(-393.9331567 \pm 0.0000407 )mm[/math]

[math]Y=(-129.1957483 \pm 0.0000587 )mm[/math]

[math]Z=(99.8193600 \pm 0.0000439697)mm[/math]

• 2 Ideal

[math]X=-394.05173[/math]

[math]Y=-129.04266[/math]

[math]Z=99.98834[/math]

Gumstix

Wiring I2C

Breakout Box END

1 - white/brown

2- brown

3-

4- blue/white

5-

6- blue

7-

8-green/white

3, 5, 7 dont have any wires.

I2C END

1 - white/orange

2- orange

3-green/white

4- blue

5- blue/white

6- green

7- brown/white

8-brown

Shopping List

Lemo

No RG58?

1.) RG174A/U Bulk Coaxial Cable - 100 feet for 36 USD [28]
2.) 10-32 Male; Crimp Attachment For RG174 - [29]
3.) 10-32 Male To 10-32 Male Cables; 50 Ohm; RG174A/U - [30]

No RG58?

4.) RG58C/U Bulk Coaxial Cable - 100 feet for 47 USD [31]

Cleaning the GEM Foils

"The basic procedure followed for cleaning GEM foils was suggested by Bob Azmoun, a researcher in the PHENIX Group at Brookhaven National Lab, via email correspondence. (See Appendix D.) The procedure, which is done under a laminar flow hood, is outlined below:

1.Spray down the foils (always at “grazing incidence”) with dry N2

2.Spray down the foils with ethyl-alcohol until foils are completely drenched, using a Windex-type dispenser spray

3.Before the ethanol has a chance to air dry (which could absorb particulate deposits from the air onto the GEM surface), quickly spray down the foils again with dry N2 (again, always at “grazing incidence”)

One should keep in mind that after this process the GEM impedance should drop dramatically, due to the conductivity of the remaining alcohol. However, usually after 5hrs of purging with dry gas, the impedance returns to its original value. "

10/3/11

1.) Confirm correct DST files for analysis and download to DAQ machine.

2.) Test GEM foils at 600 Volts

Delta_D_over_D

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