Revision as of 01:06, 14 September 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.

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)

ADC9 mean

Reprate

start

stop

Int Rate

comments

hist entries

events in scaler

3703

1127.75 .7

100

08:38:24

08:41:52 (208 s)

38.4 events/s

first measurement at full current

7853

7855

3705

782.5 1

100

09:01:10

09:04:29 ( s)

38.47 events/s

cut the current in half

7591

3706

239.1 0.6

100

09:08:40

09:12:13 ( s)

38 events/s

cut the current to its 1/4 th

8154

3707

100

09:16:19

09:21:24 ( s)

38.5 events/s

cut the current to its 1/8 th

11655

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

Fit by Sadiq

[math][/math]

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

Run time (s)

Int Rate

comments

event

pulses

3719

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

11:03:02

11:21:58

1136

4.2 events/s

206540 beam pulses

4892

206540

3720

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

11:29:52

11:44:55

903

5.069 events/s

181148 beam pulses

4568

181148

3721

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

12:02:31

12:17:32

901

3.9 events/s

180559 beam pulses

3603

180559

3722

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

12:28:13

12:49:47

1294

5.3933 events/s

268067 beam pulses

6964

268067

3724

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

13:00:34

13:21:44

1270

4.6719 events/s

Threshold on the DL is set to 52. it was 29.

5986

255841

3725

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

13:23:03

13:38:04

901

3.1237 events/s

2825

188179

3726

in

(DL & GunTrig) & (DR & GunTrig)

1150V

200

13:41:55

13:57:00

905

3.7244 events/s

sweeping magnet in

3380

180767

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

pulses

3727

in

(DL & GunTrig) & (DR & GunTrig)

1150V

200

13:58:53

14:14:01 (908 s)

3.3208 events/s

sweeping magnet in

3028

181271

3728

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

14:16:56

14:33:35 (999 s)

4.0302 events/s

sweeping magnet out

4028

199458

3729

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

14:34:31

14:50:14 (941 s)

3.2572 events/s

3104

188160

3730

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

14:51:24

15:07:44 (980 s)

4.1088 events/s

4052

195527

3731

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

200

15:08:28

15:26:02 (1054 s)

3.1478 events/s

3356

210375

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

pulses

3735

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

15:54:24

16:11:06 (1002 s)

9.0200 events/s

9045

301462

3736

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

16:12:15

16:27:07 (892 s)

4.1736 events/s

3752

268289

3737

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

16:28:05

16:46:19 (1094 s)

14.2679 events/s

15361

329368

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

pulses

3738

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

16:47:31

17:00:10 (759 s)

12.2042 events/s

9237

227946

3739

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

17:00:51

17:15:06 (855 s)

1.9458 events/s

1661

256885

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

events

pulses

3740

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

17:17:03

17:25:31 (507 s)

2.8924 events/s

1461

152406

3741

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

17:26:15

17:36:27 (612 s)

1.7331 events/s

1080

183903

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

events

pulses

3734

out

in

out

(DL & GunTrig) & (DR & GunTrig)

1150V

300-301

15:37:40

15:52:23 (883 s)

1.1425 events/s

1004

265105

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