HRRL 4-13-09

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Default HRRL running Conditions

[math]I_{peak}[/math] 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 [math]29 \pm 2[/math] mV on 1 mus scale ScopePic 4-13-09 3.png
Off + ground strap 990 Hz 3 V =60 mA [math] 72\pm 1[/math] mV on 1 mus scale ScopePic 4-13-09 4.png
on No Ground strap 990 Hz 4 V =80 mA [math] 42 \pm 2[/math] mV on 1 mus scale ScopePic 4-13-09 2.png
on + Ground strap 990 Hz 3 V =60 mA [math]66 \pm 2[/math] mV on 1 mus scale ScopePic 4-13-09 1.png
on + Ground strap + insulation 990 Hz 3 V =60 mA [math] 52\pm 30[/math] mV on 1 mus scale ScopePic 4-13-09 5.png

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 [math] 46\pm [/math]1 mV on 1 mus scale ScopePic 4-13-09 3 HRRL exp cell.png
on + Ground strap + insulation 990 Hz 3 V =60 mA [math] 52 \pm 16[/math] mV on 1 [math]\mu[/math]s scale ScopePic 4-13-09 5 HRRL exp cell.png

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.


FSC1ScopePic 4-13-09 1 HRRL exp cell.png FSC1ScopePic 4-13-09 2 HRRL exp cell.png

4/16/09

DC + FSC1 Coinc

Brick in and brick out studies. A 2x4x8 " ALuminum shutter will stop 3 MeV electrons from entering the HRRL experimental cell. Lets compare the rates seen by both a DC and a scintillator when the brick is in vs out. 

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=1900:-850:1330

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out %
In %
Out %
In %
Out %
In %
Out %


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 %
Out 1803 289 %
In 50868 1569 %


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 %
Out 11412 1612 %
In 11203 136 %


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 %
Out 2369 625 %
In 4342 124 %
Out 29594 7718 %
In 4152 113 %
Out 4073 1099 %

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%
Out 2693 866 %
In 4056 168 %
Out 5842 1934 %
In 3302 141 %


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 %
Out 3157 937 %
In 6112 204 %
Out 3046 1013 %

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 %
In 44456 102 %
Out 47695 2410 %

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 %

HV Settings S:F:G=1100:-550:770

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 %

HV Settings S:F:G=1000:-500:700

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 %
In %
Out %

ADC Measurements

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

4" r953 16:07:54 16:08:08

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


The histograms below are weighted by time, y axis reprezent number of counts per second.

Position Measurements For DCMetallica SenseWire1450Volts.gif

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.

Installing Collimator Current into ADC

Adjusting HRRL Beam Current to Drift Chamber HV

Determine Trigger

Scaler Measurements

4/20/09

Trigger 3Scint RFgate.png Go Back Qweak

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