Proton Calorimetry/Experimental Runs/2013/Dec9-10
Include all details of experimental runs from Anastasia's PDFs.
PAGE UNDER CONSTRUCTION
09/12/13
Cables:
- HV:
- 1 (RF1) to Main PMT +ve
- 3 (RN7) to DeltaE PMT -ve
- Signal
- LF6 620 - Main PMT
- LN7 1720 DeltaE PMT / Discriminator
Distance between beam and scintillator face: 30 cm from edge of collimator
Dark Rate: Main PMT
Voltage (V) | Threshold (mV) | Rate + Additional Information |
---|---|---|
1200 | 76 |
|
1000 | 76 |
|
900 | 76 |
|
800 |
|
Dark Rate: DeltaE PMT
Voltage (V) | Threshold (mV) | Rate + Additional Information |
---|---|---|
-2000 |
| |
-1800 |
|
- 1000 V, 80 mV signal, 20 Hz before beam switches on
- Beam switch on: Nothing above background rate
Beam on: 14:50, Monday 9th
- 60 MeV beam, 2 mm collimator, very low dose, 25.8 MHz frequency of cyclotron
- Rate: 50-300 Hz for 100 events (switches between the two)
- Amplitude: 1.5 V over 16 pulses
- Rise time: ~5-6 ns
High Voltage (V) | Charge Sensitivity (fC/LSB) + Other Information | File |
---|---|---|
1000 | 160 | selftrigger_1000V_160fc_001 |
- Take high voltage down to 800 V:
- Amplitude: 500 mV over 16 pulses
- Rate: ~150 Hz for 1000 events (80 mV threshold) at 800 V (after beam off and on)
- Recorded at selftrigger_800V_160fc_002
High Voltage (V) | Charge Sensitivity (fC/LSB) + Other Information | File |
---|---|---|
800 | 80 | selftrigger_800V_80fc_004 |
800 | 40 | selftrigger_800V_40fc_005 |
800 | 20 | selftrigger_800V_20fc_006 |
800 | 20
|
selftrigger_800V_20fc_83s_007 |
800 | 20
|
ST_800V_20fc_008 |
Peak at ~9240 ADC
High Voltage (V) | Rate | Collimator | File | Comments |
---|---|---|---|---|
800 | 3.2-4.6 seconds for 1000 events | 4 mm | ST_800V_20fc_013 | Rate ~50-60% higher than with 2 mm collimator |
800 | ~5 kHz | 10 mm | ST_800V_20fc_014 | |
800 | ~1 kHz | 7 mm | ST_800V_20fc_015 | Rate drops down to 300 Hz occasionally |
800 | 6.5-7 seconds for 1000 events | 2 mm |
|
- Increase current on source (previous V = 200 V)
- Rate: 0.2-1.8 s for 1000 events
- Open gas slightly (to ~5-6): 1-2 s for 1000 events
- High gas: HG_019
- Reduce dose: HD_020
10 mm lower peak:
- Mean: 11700
- σ: 434.4
10 mm upper peak:
- Mean: 21080
- σ: 1067
10/12/2013
Notes:
- Cloth off from this point
- HV: 800 V, -80 mV threshold
- Dark current with cloth (lights off): ~4 Hz
- Dark current with no cloth (lights off): ~3.8 Hz
5 minute run:
- No cloth
- 2 mm collimator
- 20 fC/LSB
- Beam on: 7s for 1000 events
- ST_800V_20fc_noC_023
Increase intensity (same collimator): 0.2 cc of gas per minute
- Rate: 2-4 s for 1000 frames
- ST_800V_20fc_2to4_024
- 0.4 cc of gas: no change
- 0.5 cc of gas: rate decreases
- 0.7 cc of gas: 5 s for 1000 frames
- 0.7 cc of gas, tweaked arc current: 1 s to 3 s for 1000 frames
- 0.9 cc of gas, 0 arc current: 2 s to 6 s for 1000 frames
- 0.9 cc of gas, 1/4 turn of arc current, 142 V: Rate too high
- 0.9 cc of gas, 25 V: 0.035-1.9 s for 1000 frames
- 0.9 cc of gas, 13.6 V: 0.04-1.9 s for 1000 frames (0.04 in most cases)
- ST_800V_20fc_0.9cc_025
Long gate reduced to 100 ns from 200 ns Pre-trigger reduced to 90 ns from 140 ns Gate offset reduced to 20 ns from 40 ns
- ST_800V_20fc_0.9cc_100nsgate_027
4 mm Collimator
Gas Flow (cc) | Voltage (V) | Time Elapsed for 1000 Frames (s) |
---|---|---|
0.9 | 6 | 0.02-1.9 |
0.8 | 6 | 0.025 |
0.8 | 0 | 1.5 |
0.8 | 3.7-11.7 | 0.1-1.8 |
0.8 | 11.7 | 0.01 |
0.6 | 16-17 | 0.02 |
File | Electronics Settings |
---|---|
ST_800V_20fc_0.6_100nsgate_028 |
|
ST_800V_20f_0.6cc_200nsgate_029 |
|
ST_800V_20fc_0.6cc_200nsgate_TH1000ns_030 |
|
ST_800V_20fc_0.6cc_100nsgate_TH1000ns_031 |
|
- Beam stop, wd: 4mm_collimator/beam_stop_selftrigger
- 4 cm of plastic (perspex)
Rate: 1s for 1000 frames, smaller amplitude
Trigger hold off: 0 Gate offset: 20 ns Threshold: 40 ns Long gate: 100 ns File: 800V_20fc_100nsG_5m_034 Description: 5 minute run with beam stop + beam on
Trigger hold off: 0 Gate offset: 20 ns Threshold: 40 ns Long gate: 100 ns File: 800V_20fc_100nsG_5m_beamoff_036 Description: Run with beam stop and beam off, 5 minutes (for natural background)
Trigger hold off: 0 Gate offset: 20 ns Threshold: 40 ns Long gate: 100 ns File: 800V_20fc_100nsG_5m_beamon_046 Description: Beam background data with beam stop, beam on with list mode dumping on Rate: 2.8-2.9 s for 1000 frames
Trigger hold off: 0 Gate offset: 20 ns Threshold: 40 ns Long gate: 100 ns File: 800V_20fc_100nsG_5m_051 Description: Remove beam stop for a 5 minute run Rate: 0.01-0.014 s for 1000 frames
Increase source intensity, change magnets
- Switching magnet: 11.7, 0.8 cc gas, 0.4 mA, 300 V source (bending the beam less)
- 0.008s for 1000 frames
Trigger hold off: 0 Gate offset: 20 ns Threshold: 40 ns Long gate: 100 ns File: 800V_20fc_100nsG_2m_005 Description: 2 minute run
Description: Switching magnet position changed by 1 click Rate: 0.25 s for 1000 frames, sometimes switches to 1.75 s File: 800V_20fc_100nsG_056 Note: Narrower peak, more background
Description: Switching magnet bending the beam more on the other side, setting: 14.0 Rate: 0.12-0.13 s for 1000 frames (bad) File: 800_20fc_100nsG_057
Description: Switching magnet setting: 14.2 Rate: 2.9s for 1000 frames (also bad) File: 800_20fc_100nsG_061
Description: Sweep back the other way, switching magnet: 11.3 Rate: 0.6-2.0s for 1000 frames File: 800_20fc_100nsG_063 Note: Better narrow peak
Back to original settings
- Switch magnet: 12.3 A
- Source: 0.1 mA, 200 V
- Gas off, rate too high
Magnet: 12.3 Source: Off Gas: Off Rate: 0.1-1.8 s for 1000 frames File: 800V_20fc_100nsG_067 Note: Energy and time
Source: 0.1 mA, ~200 V Rate: 0.007 s for 1000 frames File: 800V_20fc_100nsG_068 Note: Energy and time
Magnet: 12.3 Gas: Off Source: Off High Voltage: 800 V Rate: 0.5-1.4 s for 1000 frames File: 800V_20fc_100nsG_070
High Voltage: 900 V 800 V Amplitude: 400 mV 900 V Amplitude: 800 mV Rate at 900 V: 1.1 s for 1000 frames File: 900V_20fc_100nsG_071
Settings: All as above DC Offset: -30 File: 900V_20fc_100nsG_DC-30_074 Note: Strange widening of beam during running
Settings: All as above File: 900V_20fc_100nsG_DC-30_077 Note: Normal
Settings: Back to 800 V for PMT DC Offset: -30 File: 800V_20fc_100nsG_DC-30_081
Linearity (different proton energies with perspex thicknesses)
- wd: 4mm_collimator/lin
Settings:
- High Voltage: 800 V
- DC Offset: -30
- PMMA Position: ~1.80 upstream from module (units?)
PMMA Thickness (mm) | Rate (seconds for 1000 frames) | File |
---|---|---|
5.07 | 0.5-1.5 | 800V_20fc_100nsG_DC-30_5.07mm_083 |
9.8 | 1-2.7 | 800V_20fc_100nsG_DC-30_9.8mm_084 |
14.12 | 2.7, occasionally 1 | 800V_20fc_100nsG_DC-30_14.12mm_085 |
17.94 | 800V_20fc_200nsG_DC-30_17.94mm_086 | |
19.94 | 800V_20fc_200nsG_DC-30_19.94mm_087 | |
21.71 | 800V_20fc_200nsG_DC-30_21.71mm_088 |
DeltaE/External Trigger
- wd: 3mm_collimator/deltaE
DeltaE PMT running at 1800 V Rate (no beam): 10 events in 6 seconds (~1.5 Hz) Rate (with beam): 0.3-1.7 seconds for 100 events Threshold: 40 Long gate: 100 ns Gate offset: 40 ns DC offset: 0
Intensity Change by Phase
- wd: 4mm_collimator/phase
Source settings:
- Gas: Full
- High voltage: 800 V
- Arc current: 1 mA
- Intensity decreased by phasing
Dephase (°) | Rate |
---|---|
10 | 0.3-1.7 seconds for 1000 frames |
15 | 2.5 seconds for 10 frames |
12 | 2 seconds for 10 frames |
11 | 0.1 seconds for 100 frames (~1 kHz) |
File | 800V_20fc_100nsG_DC-30_11deg_100 |
Mean | ~8069 |
Settings:
- DC offset: -30
- Long gate: 100 ns
- Gate offset: 20 ns
Dephase (°) | Rate | Gas (cc) | Current (mA) | Mean | File | Notes |
---|---|---|---|---|---|---|
9 | 0.08 seconds for 100 frames | 1.5 | 0.2 mA | |||
0.08 seconds for 100 frames | 0.75 | 0.2 | ||||
9 | 0.1 seconds for 100 frames | 0.4 | 0.2 | ~7861 | 800V_20fc_100nsG_DC-30_9deg_103 | |
0 | 0.001 in 100 frames | 0 | 0 | ~9733 | 800V_20fc_100nsG_DC-30_0deg_105 | Dodgy shifts |
800V_20fc_100nsG_DC-30_0deg_110 | Rate has gone down by a factor of 3, dodgy |