Beam Test Jul 27 2012

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Tune

Energy Switch Out (High En)
Solenoid 1 12.4 A
Solenoid 2 7.3 A
Gun Hor -0 A
Gun Ver +0.2 A
Output Hor -0.3 A
Output Ver -0 A
Rep Rate 17
Gun HV 10 (Knob Setting)
Gun Grid Voltage 10 (Knob Setting)
RF frequency 2856.315 MHz
Modulator HV Power Supply 4.19 (Knob Setting)
RF macro Pulse Length (FWHM) 300 ns
Q1 (A) -3
Q2 (A) +0
Q3 (A) +2
Q4 (A) 0
Q5 (A) 0
Q6 (A) 0
Current at FC0 100 mA

Beam Current Calibration of Scint Left

Determine if the Beam Left Scintillator is linear with beam current.


Determine if the Beam Left Scintillator is linear with beam current.

Beam Current Calibration of Scint Left

Determine if the Beam Left Scintillator is linear with beam current.


run# Scope Pics FC1 area nVs Scint L area nVs Scint Left (Ch9) ADC9 mean Reprate start stop Int Rate comments hist entries events in scaler
3703 R3703 FC1.png R3703 SCNT L.png [math]1201.1 \pm 10.1[/math] [math]4.4 \pm .3[/math] 1127.75 [math] \pm[/math] .7 [math]1126 \pm 0.8 [/math] 100 08:38:24 08:41:52 (208 s) 38.4 events/s first measurement at full current 7853 7855
3705 R3704 FC1.png R3704 SCNT L.png [math]776.8 \pm 112[/math] [math]7.26 \pm 4.5[/math] 782.5 [math] \pm[/math] 1 [math]791.8 \pm 0.6[/math] 100 09:01:10 09:04:29 ( s) 38.47 events/s cut the current in half 7591
3706 R3706 FC1.pngR3706 SCNT L.png [math]367.7 \pm 2.32[/math] [math]6.5 \pm .34[/math] 239.1 [math] \pm[/math] 0.6 [math] 242.1 \pm 0.3 [/math] 100 09:08:40 09:12:13 ( s) 38 events/s cut the current to its 1/4 th 8154
3707 R3707 FC1.png R3707 SCNT L.png [math]203.1 \pm 0.7[/math] [math]0.2 \pm 1[/math] 100 09:16:19 09:21:24 ( s) 38.5 events/s cut the current to its 1/8 th 11655

1. T1 out, disable D1 (Q4,Q5,Q6 too), send the beam to FC0, take scope image of the area.

2. T1 in, enable D1 (Q4,Q5,Q6 too), bend the beam by 90 deg, take a run with 1000 events.


1.22 nV s /ADC channel

Fit by Sadiq

run#    FC1 area (nVs)       ADC9 mean|| 
3703    1201.1 +- 10.1       1126  +- 0.8
3705    776.8 +- 112         791.8 +- 0.6
3706    367.7 +- 2.32        242.1 +- 0.3

1. Auto fit

Hrrl pos 27Jul2012 Charge Calb fit data.png

Hrrl pos 27Jul2012 Charge Calb fit curve.png

[math] 1.063 \pm 0.013 [/math] nV s /ADC channel

Fixed point fit

In these fit, the point (0,0) introduced, and the line was forced to pass through this point. The slope was fitted by root.

1st try:

Hrrl pos 27Jul2012 Charge Calb fit data fix point 1.png

Hrrl pos 27Jul2012 Charge Calb fit curve fix point 1.png

[math]0.789 \pm 0.004[/math] nV s /ADC channel

My fixed point fit

In these fit, the point (0,0) introduced, and the line was forced to pass through this point. I choose the slopes.

1st fit: [math] 0.94 [/math] nV s /ADC channel

Hrrl pos 27Jul2012 Charge Calb fit data my fix point 1.png

Hrrl pos 27Jul2012 Charge Calb fit curve my fix point 1.png

2nd fit: [math] 0.91 [/math] nV s /ADC channel

Hrrl pos 27Jul2012 Charge Calb fit data my fix point 2.png

Hrrl pos 27Jul2012 Charge Calb fit curve my fix point 2.png


So, the average and variance is: [math] 0.94 \pm 0.02 [/math] nV s /ADC channel

The average of these three types of fit

[math] 1.063 \pm 0.013 [/math] nV s /ADC channel

[math] 0.789 \pm 0.004[/math] nV s /ADC channel

[math] 0.94 \pm 0.02 [/math] nV s /ADC channel


The average is 0.9306. The variance is 0.1372.

So, The calibration is: [math] 0.93 \pm 0.14 [/math] nV s /ADC channel

Energy calibration of Scint 1

With T1 ande T2 out, send 1,2,6, and 10 MeV electrons to Scintillator 1 located at the end of the 90 degree beam line

HV=1300


run# Electron Energy (MeV) Attenuation (dB) ADC2
3714 10 27.5 3009
3715 6 27.5 2935
3716 4 27.5 3018


Inserted gun triggers into Scaler channel 2

Resume positron production using 10 MeV eletrons

Insert Gun trigger into VME scaler

Set D2 for 2 MeV

D1 is set to 4.2 Amps, and D2 is set to 4.41 Amps.

run# T1 T2 Sweep Magnet logic HV-D2L HV-D1R Reprate start stop Run time (s) Int Rate comments event pulses
3719 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 11:03:02 11:21:58 1136 4.2 events/s 206540 beam pulses 4890 206540
3720 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 11:29:52 11:44:55 903 5.069 events/s 181148 beam pulses 4566 181148
3721 in out out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 12:02:31 12:17:32 901 3.9 events/s 180559 beam pulses 3601 180559
3722 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 12:28:13 12:49:47 1294 5.3933 events/s 268067 beam pulses 6962 268067
3724 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 13:00:34 13:21:44 1270 4.6719 events/s Threshold on the DL is set to 52. it was 29. 5984 255841
3725 in out out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 13:23:03 13:38:04 901 3.1237 events/s 2823 188179
3726 in in in (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 13:41:55 13:57:00 905 3.7244 events/s sweeping magnet in 3378 180767

during run 3725 the following were lugged into the TDC

TDC0 = Gun trigger TDC1 = ~95 ns delayed Gun trigger TDC5=N aI Left TDC7 = NaI Right TDC9 = NaI Left (CFD) TDC10 = NaI Right (CFD)

Preliminary results with no cuts

SignalFromRuns3719-3722.png

Set D2 for 1 MeV

D1 and D2 set to 2.6 Amps

run# T1 T2 Sweep Magnet logic HV-D2L HV-D1R Reprate start stop Int Rate comments events pulses
3727 in in in (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 13:58:53 14:14:01 (908 s) 3.3208 events/s sweeping magnet in 3028 181271
3728 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 14:16:56 14:33:35 (999 s) 4.0302 events/s sweeping magnet out 4028 199458
3729 in out out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 14:34:31 14:50:14 (941 s) 3.2572 events/s 3104 188160
3730 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 14:51:24 15:07:44 (980 s) 4.1088 events/s 4052 195527
3731 in out out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 200 15:08:28 15:26:02 (1054 s) 3.1478 events/s 3356 210375

Set D2 for 3 MeV

D1 and D2 set to 5.8 Amps

run# T1 T2 Sweep Magnet logic HV-D2L HV-D1R Reprate start stop Int Rate event number pulses
3735 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 15:54:24 16:11:06 (1002 s) 9.0200 events/s 9045 301462
3736 in out out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 16:12:15 16:27:07 (892 s) 4.1736 events/s 3752 268289
3737 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 16:28:05 16:46:19 (1094 s) 14.2679 events/s 15361 329368

3 MeV runs duration

7-27-12 >stat r3735.dat
 File: `r3735.dat'
 Size: 2588672   	Blocks: 5072       IO Block: 4096   regular file
Device: 902h/2306d	Inode: 17448       Links: 1
Access: (0644/-rw-r--r--)  Uid: (  500/     daq)   Gid: (  500/     daq)
Access: 2012-07-27 15:54:21.000000000 -0600
Modify: 2012-07-27 16:11:05.000000000 -0600
Change: 2012-07-30 13:00:05.000000000 -0600

16:11:05 - 15:54:21 = 1004 s 


7-27-12 >stat r3736.dat
 File: `r3736.dat'
 Size: 1081344   	Blocks: 2128       IO Block: 4096   regular file
Device: 902h/2306d	Inode: 17470       Links: 1
Access: (0644/-rw-r--r--)  Uid: (  500/     daq)   Gid: (  500/     daq)
Access: 2012-07-27 16:12:12.000000000 -0600
Modify: 2012-07-27 16:27:06.000000000 -0600
Change: 2012-07-30 13:00:05.000000000 -0600

16:27:06 - 16:12:12 = 894 s 

7-27-12 >stat r3737.dat
 File: `r3737.dat'
 Size: 4489216   	Blocks: 8800       IO Block: 4096   regular file
Device: 902h/2306d	Inode: 17468       Links: 1
Access: (0644/-rw-r--r--)  Uid: (  500/     daq)   Gid: (  500/     daq)
Access: 2012-07-27 16:28:02.000000000 -0600
Modify: 2012-07-27 16:46:18.000000000 -0600
Change: 2012-07-30 13:00:05.000000000 -0600

16:46:18 - 16:28:02 = 1096 s

Set D2 for 4 MeV

D1 and D2 at 7.5 Amps.
run# T1 T2 Sweep Magnet logic HV-D2L HV-D1R Reprate start stop Int Rate events pulses
3738 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 16:47:31 17:00:10 (759 s) 12.2042 events/s 9235 227946
3739 in out out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 17:00:51 17:15:06 (855 s) 1.9458 events/s 1659 256885

Set D2 for 5 MeV

D1 and D2 at 9.2 Amps.
run# T1 T2 Sweep Magnet logic HV-D2L HV-D1R Reprate start stop Int Rate events pulses
3740 in in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 17:17:03 17:25:31 (507 s) 2.8924 events/s 1459 152406
3741 in out out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 17:26:15 17:36:27 (612 s) 1.7331 events/s 1078 183903

Rotating Target Simulation

We want to know what happens when the tungsten target on the motor rotates and electron beam misses the target when there is a gap between target(s) .

Dipole magnets and quad magnets are set to 2 MeV positron mode.


run# T1 T2 Sweep Magnet logic HV-D2L HV-D1R Reprate start stop Int Rate events pulses
3734 out in out (DL & GunTrig) & (DR & GunTrig) 1150V 1150V 300-301 15:37:40 15:52:23 (883 s) 1.1425 events/s 1004 265105

Look for positrons using 6 MeV electrons

6 MeV electron on T1. Measure scintillator out put as function of slit distance, in electron mode. Set 2 MeV at D1 and D2. At 30 Hz reprate.

3rd Tuning (6 MeV)

Energy Switch In (Low En Range)
Solenoid 1 6.9 A
Solenoid 2 9.3 A
Gun Hor -0.1 A
Gun Ver 0 A
Output Hor 0.5 A
Output Ver 0.3 A
Rep Rate 10
Gun HV 10 (Knob Setting)
Gun Grid Voltage 10(Knob Setting)
RF frequency 2856.780 MHz
Modulator HV Power Supply 3.71 (Knob Setting)
RF macro Pulse Length (FWHM) 300 ns
Q1 (A) 0
Q2 (A) 0
Q3 (A) 0
Q4 (A) 0
Q5 (A) 0
Q6 (A) 0


Measured window width is screen (Gating on the scope is set to "Screen" mode).

Slit Width = 3.65 cm: Hrrl pos jul272012 electron En Scan Slit at 3p65.png

Slit Width = 3 cm: Hrrl pos jul272012 electron En Scan Slit at 3.png

Slit Width = 2.5 cm: Hrrl pos jul272012 electron En Scan Slit at 2p5.png

Slit Width = 2 cm: Hrrl pos jul272012 electron En Scan Slit at 2.png

Slit Width = 1.5 cm: Hrrl pos jul272012 electron En Scan Slit at 1p5.png

Slit Width = 1 cm: Hrrl pos jul272012 electron En Scan Slit at 1.png

Slit Width = 0.5 cm: Hrrl pos jul272012 electron En Scan Slit at 0p5.png

Slit Width = 0.2 cm: Hrrl pos jul272012 electron En Scan Slit at 0p2.png

Check pulse number

Check event number

source CODA/setup

cd data

xcefdmp

viewfile->Data Source r2838.dat // need to be dat file, not root file.

enter big event number to: Event Num

then go to one event earlier to get last event number.

Check pulse number

To check the number of pulses in this run:

view file->go to last pulse-> view prevous -> ROC2-> 0x260

Wiring

Magnet Mapping

  Dipole   En Predictions of 
  Coil     Matrix    MATLAB
  Current  Inversion Polyfit
  (Amps)   (MeV)     (MeV)

  2.4000    0.8870    0.8870
  2.5000    0.9510    0.9510
 2.6000    1.0149    1.0149
  2.7000    1.0787    1.0787
  2.8000    1.1424    1.1424

  4.0000    1.8985    1.8985
  4.1000    1.9608    1.9608
 4.2000    2.0230    2.0230
  4.3000    2.0852    2.0852
 4.4000    2.1472    2.1472
  4.5000    2.2091    2.2091
  4.6000    2.2710    2.2710

  5.6000    2.8836    2.8836
  5.7000    2.9443    2.9443
 5.8000    3.0049    3.0049
  5.9000    3.0654    3.0654
  6.0000    3.1257    3.1257

  7.3000    3.9014    3.9014
  7.4000    3.9604    3.9604
 7.5000    4.0192    4.0192
  7.6000    4.0780    4.0780
  7.7000    4.1366    4.1366
  7.8000    4.1952    4.1952

  9.0000    4.8896    4.8896
  9.1000    4.9468    4.9468
 9.2000    5.0039    5.0039
  9.3000    5.0609    5.0609
  9.4000    5.1178    5.1178

Data Analysis

HRRL_Pos_Test_27Jul2012_Data_Ana_1_MeV

HRRL_Pos_Test_27Jul2012_Data_Ana_2_MeV

HRRL_Pos_Test_27Jul2012_Data_Ana_3_MeV

HRRL_Pos_Test_27jul2012_Data_Ana_4_MeV

HRRL_Pos_Test_27jul2012_Data_Ana_5_MeV

Back of the envelope calculation for e+/e- ratio


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