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.

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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