HRRL 4-13-09

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
Off + ground strap	990 Hz	3 V =60 mA	[math] 72\pm 1[/math] mV on 1 mus scale
on No Ground strap	990 Hz	4 V =80 mA	[math] 42 \pm 2[/math] mV on 1 mus scale
on + Ground strap	990 Hz	3 V =60 mA	[math]66 \pm 2[/math] mV on 1 mus scale
on + Ground strap + insulation	990 Hz	3 V =60 mA	[math] 52\pm 30[/math] 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	[math] 46\pm [/math]1 mV on 1 mus scale
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

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.

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.

Brick	Gun Pulses	DC pulses	DC/Gun pulses
Out	16990	1568	9.22 %
In	54801	310	0.6%
Out	10242	841	0.6%

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