Difference between revisions of "HRRL 4-13-09"

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| In|| 37506 ||  884 || 0.4 %
 
| In|| 37506 ||  884 || 0.4 %
 
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| Out|| ||   || 8.2%
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| Out|| 5428 || 1431  || 8.2%
 
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| In||  ||  || 0.3 %
 
| In||  ||  || 0.3 %

Revision as of 19:03, 16 April 2009

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 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
Off + ground strap 990 Hz 3 V =60 mA [math] \pm [/math] mV on 1 mus scale 50px
on No Ground strap 990 Hz 4 V =80 mA [math] \pm [/math] mV on 1 mus scale 50px
on + Ground strap 990 Hz 3 V =60 mA [math] \pm [/math] mV on 1 mus scale 50px
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=1500:-750:1050

Accelerator Rep rate is 900 Hz
Brick Gun Pulses DC pulses DC/Gun pulses
Out 8021 1442 11 %
In 37506 884 0.4 %
Out 5428 1431 8.2%
In 0.3 %
Out %
In %
Out %

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 %
In %
Out %
In %
Out %
In %

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 %
Out %
In %
Out %

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 %

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