# Default HRRL running Conditions

 Pulse Width Rep Rate Energy 8 mA 25 ns 1 Hz 3 MeV

# run plan

 Date Task 4/11/09 Vaho stil running til 7 pm, configure Motion Sliders 4/12/09 Build shutter and unstack beam line 4/13/09 Install Aluminum brick shutter and interlock with HRRL, test beam transport: Run HRRL accelerator from 3pm til 5 pm (25 ns pulse width, 3 MeV electrons, 1 Hz rep rate, 8 mA peak) 4/14/09 Repair Freon leak in Chiller, HRRL down, Install DAQ 4/15/09 Run HRRL from 3 pm til 5 pm (25 ns pulse width, 3 MeV electrons, 1 Hz rep rate, 8 mA peak), Do Plateau measurements and test readout 4/16/09 Run HRRL from 9 am til 5 pm (25 ns pulse width, 3 MeV electrons, 1 Hz rep rate, 8 mA peak), Do Plateau measurements and test readout 4/17/09 Run HRRL from 2 pm til 5 pm, position studies using Drift chamber and GEM 4/20/09 Run HRRL from 9 am til 5 pm finish detector tracking studies

# 4/13/09

## Electron Dose tests

### Shutter In

0.1 mrad/hr outside HRRL experimental door.

2.7 mrad/hr in the end of HRRL experimental hallway.

### Shutter Out

0.1 mrad/hr in Dr. Forest office.

### Sintillator tests

RS1 = 2 aluminum blocks are in front of Long BLue Scintillator plugged into the cable patch panel 223A2

FS2 = Small scintillator is in 223A1

FS1 = Front Long Blue Scintillator plugged into the 223A4 and High Voltage - A3 channel.

 HV SC1 HV RS1 Desc. 840 840

## GEM noise

100 ns RF pulse width

### GEM in Accelerator room

 Bag Rep Rate Beam Current Peak to peak noise Off No ground strap 990 Hz 3 V =60 mA mV on 1 mus scale Off + ground strap 990 Hz 3 V =60 mA mV on 1 mus scale on No Ground strap 990 Hz 4 V =80 mA mV on 1 mus scale on + Ground strap 990 Hz 3 V =60 mA mV on 1 mus scale on + Ground strap + insulation 990 Hz 3 V =60 mA mV on 1 mus scale

The insulation was placed between the mylar bag and the BNC conenctor on the HV board. The inside of the mylar bag is conducting. There is a film covering the outside of the mylar bag which prevents conduction test with voltmeter.

### GEM in HRRL exp cell

 Bag Rep Rate Current Peak to peak noise Off No ground strap 990 Hz 3 V =60 mA 1 mV on 1 mus scale on + Ground strap + insulation 990 Hz 3 V =60 mA mV on 1 s scale

The insulation was placed between the mylar bag and the BNC conenctor on the HV board. The inside of the mylar bag is conducting. There is a film covering the outside of the mylar bag which prevents conduction test with voltmeter.

# 4/16/09

The Plateau Measurements were done using Aluminum Brick. A 2X4X8 Aluminum brick shutter stopped 3 MeV electrons from entering the HRRL experimental cell. The rates seen by the DC and front scintillator were compared when the brick was in vs out. Plateau Curve shown below is based on the data which is represented in this section for each DC Sense High Voltage. The DC Sense HV range was chosen from 1200 Volts to 1550 Volts. For each voltage the data was taken two or three times. It looks like the rate is not changing much in region of the DC Sense HV ~1250-1500 Volts. Below 1200 Volts of DC Sense i was not getting any events. So i decided to stop At 1200 Volts and not go below that.

Data Table
 DC Sense HV (Volts) Rate % (BrickOut-BrickIn) Rate % (Brick Out) Rate % (Brick In) 1200 0.11 0.008 0.2 0.09 0.09 0.1 1300 2.07 0.18 2.29 0.29 0.21 0.12 1400 9.25 1.35 10.73 1.97 0.3 0.08 1500 11.3 3.4 12.6 4.4 1.3 1 1550 32.57 0.46 37.17 0.62 4.6 0.16

Our Plateau Curve

Plateau Curve

ODU Efficiency curve. HV = Sense - Field

Our baby chamber measurements suggests a plateau near a sense wire HV of 1400 Volts and ODU saw a plateau near a Sense-Field high voltage of 2250 => Sense HV around 1400 volts like ours.

## DC + FSC1 Coinc

Accelerator Rep rate is 100 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 16990 1568 9.2 % In 54801 310 0.6% Out 10242 841 8.2% In 17945 93 0.5 % Out 20871 1791 8.6% In 15101 71 0.47 % Out 6549 531 8.1%

It looks like we have electrons firing the DC 10% of the time and photons less than 1% of the time.

## HV Settings S:F:G=1800:-900:1260

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 1820 285 15.6 % In 6048 161 2.7 % Out 1420 219 15.4% In 3230 110 3.4 %

## HV Settings S:F:G=1750:-875:1225

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 2022 213 10.5% In 37277 308 0.8 % Out 1502 178 % In 12152 112 % Out 2325 287 % In 35474 368 %

## HV Settings S:F:G=1700:-850:1190

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 2358 428 18 % In 6576 123 1.9 % Out 3115 531 17 % In 86819 1278 1.5 %

## HV Settings S:F:G=1650:-825:1155

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 2690 679 25 % In 3560 119 3.3 %

## HV Settings S:F:G=1600:-800:1120

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 3428 1010 29 % In 3904 120 3%

## HV Settings S:F:G=1550:-775:1085

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 2690 982 36.5 % In 2352 105 4.4 % Out 645 240 37% In 61988 2878 4.6 % Out 2391 927 38% In 2872 139 4.8%

## HV Settings S:F:G=1500:-750:1050

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 8021 1442 17 % In 37506 884 2.3 % Out 5428 1431 8.2% In 4496 116 0.3 %

## HV Settings S:F:G=1400:-700:980

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 50815 5703 11 % In 41621 178 0.4 % Out 70392 8274 8.2% In 34700 120 0.3 % Out 9835 1278 13 % In 44456 102 0.2%

## HV Settings S:F:G=1300:-650:910

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 38108 1016 2.66 % In 48996 190 0.38 % Out 23693 532 2.24% In 71868 103 0.14 % Out 86296 1693 1.96% In 124099 147 0.118 %

## HV Settings S:F:G=1200:-600:840

Accelerator Rep rate is 900 Hz

 Brick Gun Pulses DC pulses DC/Gun pulses Out 63976 141 0.2 % In 108886 97 0.09 %

1300 r936 14:41:51 14:49:18 BreakOut

1400 r937 14:50:40 14:51:14 BreakOut

1500 r938 14:54:30 14:55:44 BOut

1600 r939 14:57:10 14:58:47 Bout

1700 r940 15:00:39 15:04:47 bO

1800 r942 15:12:26 15:15:46 bo

1350 r946 15:25:24 15:26:39

1450 r948 15:31:29 15:32:05

1550 r943 15:17:40 15:19:19

1650 r944 15:20:08 15:21:00

1750 r945 15:21:40 15:22:49

## Position Measurement

break Out

HV 1450 Sense Wire

on edge of the drift chamber r949 15:48:06 15:48:50

Drift Chamber is removed from the beam r950 15:51:39 15:55:41

Beam is at the center of DC r951 15:59:45 16:00:12

(from Center) 2" r952 16:06:20 16:06:54

6" r954 16:09:01 16:09:16

The histograms below are weighted by time and background is eliminated, y axis represent number of counts per second.

 Distance from the Endplate of DCSenseWire4 (inches) Run Number Number of Events/sec (BrickOut, Integral) ADC Histogram (>100 channels) 0" r949 219 0.067 1.5" r954 257 0.062 5.5" r952 388 0.05 7.5 " r951 221 0.067 background r950 0.36 1.7

# 4/17/09

Started at 2:25 pm

 where are the log book entries for today?


## Screen

100 mA no electrons on the screen, the highest current.

At 1850 Volts on sense DC starts sparking on lowest Beam current.

# 4/20/09

## Trigger setup

As a trigger 3 Scintillators with RF Gate were used. Drift Chamber was sandwiched between the 1cm^2 Small fron PMT and Blue Second scintillator. At the end we had also blue scintillator. Two Blue scintillators were forming cross.

## Run Range

Determine range of operating conditions for DC HV, rep rate and beam current

 Run # Brick In/Out rep rate (Hz) current (ma) Number RF gates (SCAL13) Number Coincidences (SCAL08) DC singles FC spectrum DC spectrum comments 999 Out 65 40 1000 Out 900 40 100px

Looks like we should run at 40 mA peak current and change the DC HV from 1200 to 1600 Volts on the sense wire

## Plateau Measurements

 Run # Brick In/Out rep rate (Hz) current (ma) DC HV (S:F:G) Number RF gates (SCAL13) Number Coincidences (SCAL08) DC coinc with 3PMT + RF gate (SCAL02) Rate SCAL02/SCAL13 (%) FC spectrum DC spectrum DC spectrum(CUT on ADC>80, log scale) Events/sec comments 1003 Out 65 40 1600:: 109632 217476 28709 26.2 100px 100px Overflows in DC ADC spectrum 1006 Out 900 40 1600 115719 212130 37534 32.4 1007 Out 900 40 1550 5781 2427 1751 30.3 100px 1008 Out 900 40 1550 5803 2399 1832 32 2dB attenuation added 1009 Out 900 40 1500 5650 2376 1705 30.2 100px 1010 Out 900 40 1500 100px 1012 Out 900 40 1500 4589 1842 1385 30.2 5dB attenuation added 1014 Out 900 40 1450 6285 2609 1875 30 1015 Out 900 40 1400 6089 2501 1743 28.6 1016 Out 900 40 1350 9398 3799 998 10.6 1017 Out 900 40 1300 6567 2681 1167 17.7 1018 Out 900 40 1250 5440 2278 694 12.7 1019 Out 900 40 1200 4123 1738 619 15 1020 out 900 40 1150 4402 1798 790 17 1021 out 900 40 1425 5521 2280 1812 32 1022 in 900 40 1425 4681 1531 825 17.6 1023 in 900 40 1600 3748 1155 739 19 100px 1024 in 900 40 1550 6156 1899 1172 19 100px 1025 in 900 40 1500 6280 1920 1230 19 100px 1026 in 900 40 1450 3631 1142 799 22 100px 1042 in 900 40 1300 3616 1167 424 11.7 1043 in 900 40 1350 3453 1094 441 13 1044 in 900 40 1250 3719 1262 598 16 1045 in 900 40 1200 3270 1004 342 10 1046 in 900 40 1150 2731 911 282 10

At 1350 Volts HV of Sense wire the count rate seemed like dropped, so i did scaler measurements again twice when the brick was out, and i got the following result: 27 % instead of 10 %. (2867 - 1116 - 776) .

## Position measurements

On y axis of ADC Histograms i have number of events per second.

 Run # Brick In/Out rep rate (Hz) current (ma) Distance from the Endplate of DCSenseWire4 (inches) Number RF gates (SCAL13) Number Coincidences (SCAL08) DC coinc with 3PMT + RF gate (SCAL02) Rate SCAL02/SCAL13 (%) DC_ADC Histograms(ADC15 && ADC8(FC)>1000) DC_ADC Histograms(ADC15>80 && FC>1000) Rate% (ADC15>80&&FC>1000) Rate % (ADC15>80&&FC>1000/ADC15&&ADC8(FC)>1000) 1028 Out 900 65 1" 3561 1462 819 22 1029 Out 900 65 2" 9988 4012 2480 25 1030 Out 900 65 3" 4738 1943 1217 25 1031 Out 900 65 4" 4683 1891 1214 26 1032 Out 900 65 6" 2440 1001 619 26 1033 Out 900 65 7.5" 3420 1414 965 28 1041 Out 900 65 -2" 4570 1843 41 0.9 1039 In 900 65 1" 4074 1342 388 10 1038 In 900 65 2" 5242 1681 554 10 1037 In 900 65 3" 2366 755 261 11 1036 In 900 65 4" 2437 821 287 12 1035 In 900 65 6" 2926 904 320 11 1034 In 900 65 7.5" 3948 1247 408 10 1040 In 900 65 -2" 5516 1780 18 0.3

#### Scaler Results

Data Summery Table
 Distance from the Endplate of DCSenseWire4 (inches) Rate % (BrickOut-BrickIn) Rate % (Brick In) Rate % (Brick Out) 1" 12 0.53 10 0.3 22 0.2 2" 12 0.52 10 0.3 25 0.2 3" 15 0.5 11 0.3 25 0.2 4" 14 0.48 12 0.3 26 0.19 6" 15 0.5 11 0.3 26 0.19 7.5 " 18 0.51 10 0.3 28 0.19 -2 0.6 2.88 0.9 1 0.3 1.8

Example Calculating the mean value of Rate

I chose r1028.root file. The run was broken into three runs. For each run Faraday Cup was made(FC>1000).

Run divided into three separate files:

THe mean value and error for each file was done using the weighted error propagation [1].

Data Summery Table

 Distance from the Endplate of DCSenseWire4 (inches) Rate % (BrickOut-BrickIn) Rate % (Brick Out) Rate % (Brick In) 1" 17 0.87 28 0.4 11 0.47 2" 21 1.23 35 0.48 14 0.75 3" 20 1.34 36 0.44 16 0.9 4" 21 1.4 38 0.6 17 0.8 6" 22 1.297 39 0.557 17 0.74 7.5 " 22 1.32 39 0.48 17 0.84 -2 0.3 0.97 2.7 0.4 2.4 0.57

Example Calculating Weighted Error

Puts cuts on ADC data until rate is the same as with scaler data then overlay position measurements plots

#### DC efficiency

Plot histogram for all runs to check if pedestal is in same location.


Some ADC runs had 3 scintillators in coincidence. Use this to check DC efficiency. plot as function of HV the ratio of DC hits to coincidences. use the ADC value for the wire output to do several different signal thresholds.