Proton Calorimetry/Experimental Runs/2016/Aug2-3
Dose calibration at Clatterbridge: 0.9 Gy per monitor unit (MU) at 60 MeV.
Day 1 (August 2nd)
Wheel calibration
- Wheel segments are each ~4 mm.
- Distance between collimator exit (downstream face of collimator) and the start of the wheel (the upstream face) is 37.5 mm.
- Distance between the black box edge and upstream edge of the wheel is 41 mm.
Electronic equipment setup:
- DC offset: -30 mV
- Record length: 456 ns
- Threshold: 40 LSB
- Trigger: 194 mV
- Gate offset: 10 ns
- Pre-trigger: 50 ns
- Charge sensitivity: 20 fc/LSB
| High voltage (V) |
Trigger | Rate & additional information | Collimator size & beam information | Wheel step position | Data recorded | Run number | Comments |
|---|---|---|---|---|---|---|---|
| -900 | ST |
Beam off:
Beam on:
|
1.98 mm
Beam startup:
Beam settings change:
|
N/A | [startup] | Beam startup and calibration | |
| -900 | ST | 0 | ADC | 01 | ~7,000 events in peak | ||
| -900 | ST | 0 | waveforms | 03 | ~7,000 events in peak | ||
| -900 | ST | 20 | ADC | 05 | ~7,000 events in peak | ||
| -900 | ST | 40 | ADC | 06 | ~7,000 events in peak | ||
| -900 | ST | 60 | ADC | 07 | ~7,000 events in peak | ||
| -900 | ST | 80 | ADC | 08 | ~7,000 events in peak | ||
| -900 | ST | 100 | ADC | 09 | ~7,000 events in peak | ||
| -900 | ST | 100 | waveforms (~0.5 GB) |
11 | Beam dropped. Repeat in Run 13. | ||
| -900 | ST | 100 | waveforms (~1 GB) |
13 | Repeat of Run 10. | ||
| -900 | ST | 120 | ADC | 14 | ~7,000 events in peak | ||
| -900 | ST | 140 | ADC | 15 | ~7,000 events in peak | ||
| -900 | ST | 160 | ADC | 16 | ~6,000 events in peak | ||
| -900 | ST | 130 | ADC | 17 | ~7,000 events in peak | ||
| -900 | ST | 150 | ADC | 18 | ~6,000 events in peak | ||
| -900 | ST | 165 (Just before Bragg peak, which is at wheel step 166.) | ADC | 19 | ~6,000 events in peak. | ||
| -900 | ST | 170 | ADC | 20 | Beam dropped. ~4,000 events in peak. Repeat in Run 21. | ||
| -900 | ST | 170 | ADC | 21 | Repeat of Run 20. ~4,000 events in peak. | ||
| -900 | ST | 173 (Bragg peak fall-off area.) | ADC | 22 | Beam dropped. Repeat in Run 23. | ||
| -900 | ST | 173 | ADC | 23 | Repeat of Run 22. ~1.800 events in peak | ||
| -900 | ST | 175 | ADC | 24 | |||
| -900 | ST | 179 | ADC | 25 | ~30 events in peak. No "peak" apparent; potentially only secondaries. | ||
| -900 | ST | 167 (Tip of Bragg peak.) | ADC | 26 | ~7,000 events in peak. | ||
| -900 | ST | Rate: 25 kHz (1,000 events in 45 ms) | 0 | ADC | 27 | ~7,000 events in peak. Back to starting point on calibration wheel to compare with Run 01. | |
| BEAM OFF. Integrated dose: Dose A: 36.7 MU. Dose B: 36.6 MU. Total beam time run: 99 min. | |||||||
| -900 | ST | 0 | ADC | 28 | Background run. Acquisition left over lunch. ~140 events in peak. | ||
[LUNCH] - approx. 1 hr.
PMMA modulator block cross-check
PMMA modulator blocks of thickness equivalent to particular steps of calibration wheel inserted into beamline at location of wheel (just downstream of nozzle) and upstream inside modulator box to cross-check against data obtained earlier using calibration wheel.
| High voltage (V) |
Trigger | Rate & additional information | Collimator size & beam information | PMMA thickness (mm) |
Position of PMMA block | Data recorded | Run number | Comments |
|---|---|---|---|---|---|---|---|---|
| BEAM ON. Dose monitor operation reset. | ||||||||
| -900 | ST | Rate: 20 kHz | Threshold: 40 LSB | 0 (No PMMA. Calibration wheel removed.) | N/A | ADC | 29 | ~7,000 events in peak |
| -900 | ST | 0 | N/A | waveforms (~1.2 GB) |
31 | |||
| -900 | ST | Rate: ~25 kHz | 7.24 mm (corresponding to wheel step 40; 8.3 mm water) | Same position the calibration wheel was. | ADC | 32 | ~7,000 events in peak | |
| -900 | ST | 7.24 mm | Same position the calibration wheel was. | waveforms (~1 GB) |
34 | |||
| -900 | ST | Rate: ~12 kHz | 7.24 mm | Upsteam in usual position inside modulator box. | ADC | 35 | ~7,000 events in peak. Beam misbehaviour (shifting) starting with this run and onwards. | |
| -900 | ST | 7.24 mm | Upsteam in usual position inside modulator box. | waveforms (~1.1 GB) |
36 | |||
| -900 | ST | ADC: ~4373 After beam shift Rate: ~20 kHz |
13.4 mm (corresponding to wheel step 80; 15.6 mm water) | Same position the calibration wheel was. | ADC | 37 | ~7,000 events in peak | |
| -900 | ST | 13.4 mm | Same position the calibration wheel was. | waveforms (~1 GB) |
38 | |||
| -900 | ST | Rate: ~7 kHz ADC: ~4900 After beam shift |
13.4 mm | Upsteam in usual position inside modulator box. | ADC | 39 | ~5,000 events in peak | |
| -900 | ST | 13.4 mm | Upsteam in usual position inside modulator box. | waveforms (~1 GB) |
40 | |||
| BEAM OFF. Integrated dose: Dose A: 6.7 MU. Dose B: 6.9 MU. Total beam time run: 94.19 min. | ||||||||
Rate tests
All PMMA absorbers removed from beam. 1.98 mm collimator still in place.
| High voltage (V) |
Trigger | Rate & additional information | Collimator size & beam information | Data recorded | Run number | Comments |
|---|---|---|---|---|---|---|
| BEAM ON. Dose monitor operation reset. | ||||||
| -900 | ST | Rate: 20 kHz Foil current: 0.005 nA Arc current: 50 μA |
ADC | 41 | ~7,000 events in peak. No absorbers in beam. | |
| -900 | ST | waveforms (~1 GB) |
42 | |||
| -900 | ST | Rate: 50 kHz Foil current: 0.0125 nA Arc current: 75 μA |
ADC | 43 | ~7,000 events in peak. Increased arc current to up the rate. | |
| -900 | ST | waveforms (~1 GB) |
44 | |||
| -900 | ST | Dose rate: 0.4 - 0.5. Before rate drop
After rate drop
|
ADC | 45 | ~10,000 events in peak. | |
| -900 | ST | waveforms (~1.6 GB) |
46 | |||
| -900 | ST | Rate: 140 kHz Foil current: 0.0500 nA Arc current: 400 μA |
ADC | 47 | ~15,000 events in peak. Increased arc current to up the rate. | |
| -900 | ST | Foil current: Dropped from ~0.0450 nA to 0.0370 nA | waveforms (~1.6 GB) |
48 | ||
| BEAM OFF. Integrated dose: Dose A: 6.7 MU. Dose B: 6.9 MU. Total beam time run: 94.19 min. | ||||||
LeCroy scope data
Day 2 (August 3rd)
Scope 2: LeCroy HDO6104 [1], Datasheet Template:PDFlink