Difference between revisions of "Beam Test Jul 27 2012"
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Revision as of 23:28, 2 August 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 |   |
1127.75 .7 | 100 | 08:38:24 | 08:41:52 ( s) | 38.4 events/s | first measurement at full current | ||
| 3705 |   |
782.5 1 | 100 | 09:01:10 | 09:04:29 ( s) | 38.47 events/s | cut the current in half | ||
| 3706 |   |
239.1 0.6 | 100 | 09:08:40 | 09:12:13 ( s) | 38 events/s | cut the current to its 1/4 th | ||
| 3707 |   |
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 |
| 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 | comments |
| 3735 | in | in | out | (DL & GunTrig) & (DR & GunTrig) | 1150V | 1150V | 300-301 | 15:54:24 | 16:11:06 (996 s) | 9.0200 events/s | |
| 3736 | in | out | out | (DL & GunTrig) & (DR & GunTrig) | 1150V | 1150V | 300-301 | 16:12:15 | 16:27:07 (892 s) | 4.1736 events/s | |
| 3737 | in | in | out | (DL & GunTrig) & (DR & GunTrig) | 1150V | 1150V | 300-301 | 16:28:05 | 16:46:19 () | 14.2679 events/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 | comments |
| 3738 | in | in | out | (DL & GunTrig) & (DR & GunTrig) | 1150V | 1150V | 300-301 | 16:47:31 | 17:00:10 () | 12.2042 events/s | |
| 3739 | in | out | out | (DL & GunTrig) & (DR & GunTrig) | 1150V | 1150V | 300-301 | 17:00:51 | 17:15:06 () | 1.9458 events/s |
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 | |
| 3741 | in | out | out | (DL & GunTrig) & (DR & GunTrig) | 1150V | 1150V | 300-301 | 17:26:15 | 17:36:27 () | 1.7331 events/s |
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 |
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: 
Wiring
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