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	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
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
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.

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.

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

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	FC spectrum	DC spectrum	comments
1003	Out	65	40	1600::	109632	217476	28709			Overflows in DC ADC spectrum
1006	Out	900	40	1600	115719	212130	37534	100px	100px
1006	Out	900	40	1550				100px	100px
1006	Out	900	40	1500				100px	100px
1006	Out	900	40	1450				100px	100px

Position measurements

Go Back Qweak