Beam Test Jul 27 2012

Tune

Energy Switch	Out (High En)
Solenoid 1	12.4 A
Solenoid 2	7.3 A
Gun Hor	-0 A
Gun Ver	+0.2 A
Output Hor	-0.3 A
Output Ver	-0 A
Rep Rate	17
Gun HV	10 (Knob Setting)
Gun Grid Voltage	10 (Knob Setting)
RF frequency	2856.315 MHz
Modulator HV Power Supply	4.19 (Knob Setting)
RF macro Pulse Length (FWHM)	300 ns
Q1 (A)	-3
Q2 (A)	+0
Q3 (A)	+2
Q4 (A)	0
Q5 (A)	0
Q6 (A)	0
Current at FC0	100 mA

Beam Current Calibration of Scint Left

Determine if the Beam Left Scintillator is linear with beam current.

Determine if the Beam Left Scintillator is linear with beam current.

Beam Current Calibration of Scint Left

Determine if the Beam Left Scintillator is linear with beam current.

run#	Scope Pics	FC1 area nVs	Scint L area nVs	Scint Left (Ch9)	Reprate	start	stop	Int Rate	comments
3703		[math]1201.1 \pm 10.1[/math]	[math]4.4 \pm .3[/math]	1127.75 [math] \pm[/math] .7	100	08:38:24	08:41:52 ( s)	38.4 events/s	first measurement at full current
3705		[math]776.8 \pm 112[/math]	[math]7.26 \pm 4.5[/math]	782.5 [math] \pm[/math] 1	100	09:01:10	09:04:29 ( s)	38.47 events/s	cut the current in half
3706		[math]367.7 \pm 2.32[/math]	[math]6.5 \pm .34[/math]	239.1 [math] \pm[/math] 0.6	100	09:08:40	09:12:13 ( s)	38 events/s	cut the current to its 1/4 th
3707		[math]203.1 \pm 0.7[/math]	[math]0.2 \pm 1[/math]		100	09:16:19	09:21:24 ( s)	38.5 events/s	cut the current to its 1/8 th

1. T1 out, disable D1 (Q4,Q5,Q6 too), send the beam to FC0, take scope image of the area.

2. T1 in, enable D1 (Q4,Q5,Q6 too), bend the beam by 90 deg, take a run with 1000 events.

1.22 nV s /ADC channel

Energy calibration of Scint 1

With T1 ande T2 out, send 1,2,6, and 10 MeV electrons to Scintillator 1 located at the end of the 90 degree beam line

HV=1300

run#	Electron Energy (MeV)	Attenuation (dB)	ADC2
3714	10	27.5	3009
3715	6	27.5	2935
3716	4	27.5	3018

Inserted gun triggers into Scaler channel 2

Resume positron production using 10 MeV eletrons

Insert Gun trigger into VME scaler

Set D2 for 2 MeV

D1 is set to 4.2 Amps, and D2 is set to 4.41 Amps.

run#	T1	T2	Sweep Magnet	logic	HV-D2L	HV-D1R	Reprate	start	stop	Int Rate	comments
3719	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	200	11:03:02	11:21:58	4.2 events/s	206540 beam pulses
3720	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	200	11:29:52	11:44:55	5.069 events/s	181148 beam pulses
3721	in	out	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	200	12:02:31	12:17:32	3.9 events/s	180559 beam pulses
3722	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	200	12:28:13	12:49:47	5.3933 events/s	268067 beam pulses
3724	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	200	13:00:34	13:21:44	4.6719 events/s	Threshold on the DL is set to 52. it was 29.
3725	in	out	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	200	13:23:03	13:38:04	3.1237 events/s
3726	in	in	in	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	200	13:41:55	13:57:00	3.7244 events/s	sweeping magnet in

during run 3725 the following were lugged into the TDC

TDC0 = Gun trigger TDC1 = ~95 ns delayed Gun trigger TDC5=N aI Left TDC7 = NaI Right TDC9 = NaI Left (CFD) TDC10 = NaI Right (CFD)

Preliminary results with no cuts

Set D2 for 1 MeV

D1 and D2 set to 2.6 Amps

run#

T1

T2

Sweep Magnet

logic

HV-D2L

HV-D1R

Reprate

start

stop

Int Rate

comments

events

3727

in

in

in

(DL & GunTrig) & (DR & GunTrig)

1150V

1150V

200

13:58:53

14:14:01 (908 s)

3.3208 events/s

sweeping magnet in

3728

in

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

1150V

200

14:16:56

14:33:35 (999 s)

4.0302 events/s

sweeping magnet out

3729

in

out

out

(DL & GunTrig) & (DR & GunTrig)

1150V

1150V

200

14:34:31

14:50:14 (941 s)

3.2572 events/s

3730

in

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

1150V

200

14:51:24

15:07:44 (980 s)

4.1088 events/s

3731

in

out

out

(DL & GunTrig) & (DR & GunTrig)

1150V

1150V

200

15:08:28

15:26:02

3.1478 events/s

Set D2 for 3 MeV

D1 and D2 set to 2.8 Amps

run#	T1	T2	Sweep Magnet	logic	HV-D2L	HV-D1R	Reprate	start	stop	Int Rate	event number
3735	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	15:54:24	16:11:06 (1002 s)	9.0200 events/s	9045
3736	in	out	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	16:12:15	16:27:07 (892 s)	4.1736 events/s	3752
3737	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	16:28:05	16:46:19 (1094 s)	14.2679 events/s	15361

3 MeV runs duration

7-27-12 >stat r3735.dat
 File: `r3735.dat'
 Size: 2588672   	Blocks: 5072       IO Block: 4096   regular file
Device: 902h/2306d	Inode: 17448       Links: 1
Access: (0644/-rw-r--r--)  Uid: (  500/     daq)   Gid: (  500/     daq)
Access: 2012-07-27 15:54:21.000000000 -0600
Modify: 2012-07-27 16:11:05.000000000 -0600
Change: 2012-07-30 13:00:05.000000000 -0600

16:11:05 - 15:54:21 = 1004 s

7-27-12 >stat r3736.dat
 File: `r3736.dat'
 Size: 1081344   	Blocks: 2128       IO Block: 4096   regular file
Device: 902h/2306d	Inode: 17470       Links: 1
Access: (0644/-rw-r--r--)  Uid: (  500/     daq)   Gid: (  500/     daq)
Access: 2012-07-27 16:12:12.000000000 -0600
Modify: 2012-07-27 16:27:06.000000000 -0600
Change: 2012-07-30 13:00:05.000000000 -0600

16:27:06 - 16:12:12 = 894 s

7-27-12 >stat r3737.dat
 File: `r3737.dat'
 Size: 4489216   	Blocks: 8800       IO Block: 4096   regular file
Device: 902h/2306d	Inode: 17468       Links: 1
Access: (0644/-rw-r--r--)  Uid: (  500/     daq)   Gid: (  500/     daq)
Access: 2012-07-27 16:28:02.000000000 -0600
Modify: 2012-07-27 16:46:18.000000000 -0600
Change: 2012-07-30 13:00:05.000000000 -0600

16:46:18 - 16:28:02 = 1096 s

Set D2 for 4 MeV

D1 and D2 at 7.5 Amps.

run#	T1	T2	Sweep Magnet	logic	HV-D2L	HV-D1R	Reprate	start	stop	Int Rate	events
3738	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	16:47:31	17:00:10 ()	12.2042 events/s	9237
3739	in	out	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	17:00:51	17:15:06 ()	1.9458 events/s	1661

Set D2 for 5 MeV

D1 and D2 at 9.2 Amps.

run#	T1	T2	Sweep Magnet	logic	HV-D2L	HV-D1R	Reprate	start	stop	Int Rate	comments
3740	in	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	17:17:03	17:25:31 ()	2.8924 events/s	1461
3741	in	out	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	17:26:15	17:36:27 ()	1.7331 events/s	1081

Rotating Target Simulation

We want to know what happens when the tungsten target on the motor rotates and electron beam misses the target when there is a gap between target(s) .

Dipole magnets and quad magnets are set to 2 MeV positron mode.

run#	T1	T2	Sweep Magnet	logic	HV-D2L	HV-D1R	Reprate	start	stop	Int Rate	comments
3734	out	in	out	(DL & GunTrig) & (DR & GunTrig)	1150V	1150V	300-301	15:37:40	15:52:23	1.1425 events/s	1004

Look for positrons using 6 MeV electrons

6 MeV electron on T1. Measure scintillator out put as function of slit distance, in electron mode. Set 2 MeV at D1 and D2. At 30 Hz reprate.

3rd Tuning (6 MeV)

Energy Switch	In (Low En Range)
Solenoid 1	6.9 A
Solenoid 2	9.3 A
Gun Hor	-0.1 A
Gun Ver	0 A
Output Hor	0.5 A
Output Ver	0.3 A
Rep Rate	10
Gun HV	10 (Knob Setting)
Gun Grid Voltage	10(Knob Setting)
RF frequency	2856.780 MHz
Modulator HV Power Supply	3.71 (Knob Setting)
RF macro Pulse Length (FWHM)	300 ns
Q1 (A)	0
Q2 (A)	0
Q3 (A)	0
Q4 (A)	0
Q5 (A)	0
Q6 (A)	0

Measured window width is screen (Gating on the scope is set to "Screen" mode).

Slit Width = 3.65 cm:

Slit Width = 3 cm:

Slit Width = 2.5 cm:

Slit Width = 2 cm:

Slit Width = 1.5 cm:

Slit Width = 1 cm:

Slit Width = 0.5 cm:

Slit Width = 0.2 cm:

Check pulse number

source CODA/setup

cd data

xcefdmp

viewfile->Data Source r2838.dat // need to be dat file, not root file.

enter big event number to: Event Num

then go to one event earlier to get last event number.

Data Analysis

Subtracted Sepctrums: HRRL_Pos_Test_27Jul2012_Data_Ana_4_MeV

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