Proton Calorimetry/Experimental Runs/2016/Aug2-3

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Dose calibration at Clatterbridge: 0.9 Gy per monitor unit (MU) at 60 MeV.

Contents


Day 1 (August 2nd)

Note: Construction going on in room next to control room.

Calibration wheel

  • 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:

  • I: 150.51 μ

Beam on:

  • Rate: 300 kHz on startup.
  • Rate: 25 kHz at -100 mV.
Collimator: 1.98 mm

Beam startup:

  • Arc current: 750 mV
  • Gas source: 0.67 cc/min

Beam settings change:

  • Arc current: 50 μ
  • Gas source: 0.39 cc/min
  • Dose rate: 0.1 MU/min
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
  • Rate: 85 kHz

After rate drop

  • Rate: 90 kHz
Before rate drop
  • Foil current: 0.0250 nA
  • Arc current: 150;μA
  • I: 150.5;μA

After rate drop

  • Foil current: 0.0300 nA
  • Arc current: 200;μA
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
-900 ST Rate: 250 kHz Foil current: Dropped from 0.1080 nA to 0.1050 nA
Arc current: 800 μA
I: 151.3 μA
ADC 49 ~15,000 events in peak. Increased arc current to up the rate.
-900 ST Foil current and rate went down over time. Arc current down to 700 μA waveforms
(~2 GB)
50
-900 ST Rate: 300 kHz (scope)
Foil current: 0.25-0.27 nA --> 500 kHz (extrapolated)
I: 170.5 μA
Arc current: 1.2 mA
ADC 51 ~300 events in peak. Pile-up seen in ADC spectrum.
-900 ST Foil current: 0.20-0.27 nA
I: 171.2 μA
waveforms
(~2 GB)
53
BEAM OFF.
Integrated dose: Dose A: 134.7 MU. Dose B: 134.2 MU.
Total beam time run: 92.22 min.


LeCroy scope data

Scope 2: LeCroy HDO6104 [1], datasheet PDF | 1.4 MB

Pulse parameters:

  • ~500 mV
  • Threshold of ~-77 mV.
  • Note: Slight reflection seen at ~350 ns after main pulse, which is equivalent to ~10 m (given that the speed of light in a cable is ~4 ns/m).
High voltage
(V)
Absorber Position Rate File directory File number & data recorded Run/digitiser file number equivalents Comments
-900 none N/A 20 kHz 1.98mmcol_noabs_25kHzrate 0-1: ASCII
00-49: binary
Trigger threshold: -75 mV
-900 7.24 mm PMMA Same position modulator wheel was. 25 kHz 1.98mmcol_7.24mmabs_25kHzrate 00-051: binary 032, 034
-900 7.24 mm PMMA Upsteam in usual position inside modulator box. 12 kHz 1.98mmcol_7.24mmabs_12kHzrate 00-50: binary 035, 036
-900 13.4 mm PMMA Same position modulator wheel was. 20 kHz 1.98mmcol_13.4mmabs_20kHzrate 00-50: binary 037, 038
-900 13.4 mm PMMA Upsteam in usual position inside modulator box. 7 kHz 1.98mmcol_13.4mmabs_7kHzrate 00-50: binary 039, 040
-900 none N/A 20 kHz 1.98mmcol_ratetest_20kHzrate 00-050: binary 041, 042
-900 none N/A 50 kHz 1.98mmcol_ratetest_50kHzrate 00-050: binary 043, 044
-900 none N/A 85 kHz 1.98mmcol_ratetest_85kHzrate 00-050: binary 045, 046
-900 none N/A 140 kHz 1.98mmcol_ratetest_140kHzrate 00-050: binary 047, 048
-900 none N/A 250 kHz 1.98mmcol_ratetest_250kHzrate 00-050: binary 049, 050
-900 none N/A 300 kHz (scope)
500 kHz (based on scattering foil current)
1.98mmcol_ratetest_500kHzrate 00-050: binary 051, 053

Day 2 (August 3rd)

Rate tests (continued)

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 control reset.
-900 ST Rate: 6-7 kHz
Dose rate: 0-0.1 MU/min
1.98 mm collimator
Foil current: 0.016 nA
Arc current: 50 μA
Gas source: 0.39 cc/min
ADC 54 ~5,000 events in peak. No absorbers in beam.
-900 ST Rate: 8 kHz
Threshold: -40 kHz to match digitiser)
waveforms
(~1.1 GB)
55
-900 ST Rate: 170 kHz
Dose rate: 0.9 MU/min
Foil current: 0.066-68 nA
Arc current: 500 μA
ADC 56 ~7,000 events in peak
-900 ST waveforms
(~1.4 GB)
57
-900 ST Rate: 125 kHz
Dose rate: 0.5 MU/min
I: 150.55 μA
Foil current: 0.0042 nA
Arc current: 500 μA
Gas source: 1.0 cc/min
ADC 58 ~7,000 events in peak. Increased gas flow: No change when increased to 0.80 cc/min. Foil current decreased when increased to 1.0 cc/min.
-900 ST waveforms
(~1 GB)
59
-900 ST Rate: 250 kHz (scope)
Dose rate: 1.7 MU/min
I: 151.4 μA
Foil current: 0.120-130 nA
Arc current: 1 mA
ADC 60 ~10,000 events in peak. Increased arc current.
-900 ST waveforms
(~2 GB)
61
-900 ST Rate: 300 kHz (scope)
Rate: 500 kHz (current)
Dose rate: 2.8 MU/min
I: 152.25 μA
Foil current: 0.2 nA
Arc current: 1.3 mA
ADC 62 ~10,000 events in peak. Increased arc current.
-900 ST waveforms
(~2 GB)
63
-900 ST Dose rate: 5.5 MU/min
I: 173 μA
Foil current: 0.35-0.4 nA
Arc current: 1.6 mA
ADC 64 ~2,000 events in peak. Increased arc current.
-900 ST waveforms
(~2.1 GB)
65
BEAM OFF.
Integrated dose: Dose A: 126.9 MU. Dose B: 126.2 MU.
Total beam time run: 69.28 min.


Off-axis collimator tests

wd: /ham_stdCub/0.5mm

High voltage
(V)
Trigger Rate & additional information Collimator size & beam information Data recorded Run number Comments
BEAM ON.
Dose monitor control reset.
-900 ST After adjustment:
  • Rate: 150kHz
  • I: 150.7 μA
Collimator: 0.5 mm (centre/on axis)

Beam start:

  • Foil current: 0.8 nA
  • Arc current: 1.6 mA
  • Gas source: 1 cc/min

After adjustment:

  • Foil current: 1.6 nA (cycling from 0)
  • Arc current: 2 mA
ADC
-900 ST Rate: 230kHz
Dose rate: 23 MU/min
I: 151.3 μA
Foil current: ~1.6 nA
Gas source: 0.6 cc/min
ADC 66 ~5,000 events in peak.
-900 ST waveforms
(~2.1 GB)
67
BEAM OFF.
Integrated dose: Dose A: 257.0 MU. Dose B: 255.3 MU.
Total beam time run: 13.66 min.
BEAM ON.
Dose monitor control reset.
-900 ST Rate: 250kHz
I: 151.6 μA
ADC μ:~6150
Collimator: 0.5 mm (8 mm off-axis, left of centre (into the beam)). Note: Scintillator is centred for resulting collimator each time.
Foil current: ~1.8-1.4 nA Arc current: 2 mA
Gas source: 0.6 cc/min
ADC 68 ~7,000 events in peak.
-900 ST waveforms
(~1.5 GB)
69
BEAM OFF.
BEAM ON.
-900 ST ADC μ:~6200 Collimator: 0.5 mm (8 mm off-axis, top of centre).
Foil current: ~1.4 nA
ADC 70 ~7,000 events in peak.
-900 ST waveforms
(~1.5 GB)
71
BEAM OFF.
Integrated dose: Dose A: 349.4.0 MU. Dose B: 347.1 MU.
Total beam time run: 16.36 min.
BEAM ON.
-900 ST ADC μ:~6150 Collimator: 0.5 mm (8 mm off-axis, bottom of centre).
Foil current: ~1.3 nA
ADC 72 ~7,000 events in peak.
-900 ST waveforms
(~1.7 GB)
73
BEAM OFF.
BEAM ON.
-900 ST Rate: 110 kHz
I: 150 μA
ADC μ:~2450
Collimator: 0.5 mm (16 mm off-axis, bottom of centre).
Foil current: ~1.1-1.2 nA
ADC 74 ~10,000 events in peak.
-900 ST waveforms
(~1.1 GB)
75
BEAM OFF.
BEAM ON.
-900 ST Collimator: 0.5 mm (16 mm off-axis, left of centre). ADC 76
-900 ST Rate: 100 kHz
I: 150.3 μA
ADC μ:~2450

Foil current: ~1.0-1.1 nA
ADC 77 ~10,000 events in peak.
-900 ST waveforms
(~1.8 GB)
78
BEAM OFF.
Integrated dose: Dose A: 411.1 MU. Dose B: 408.5 MU.
Total beam time run: 24.04 min.


[LUNCH] - approx. 1 hr.

Calibration wheel (fine)

wd: ham_stdCub/1.98mm/wheel

High voltage
(V)
Trigger Rate & additional information Collimator size & beam information Wheel step position Data recorded Run number Comments
BEAM ON.
Dose monitor control reset.
-900 ST
  • Rate: 9-10 kHz
  • I: 150.2 μA
  • Collimator: 1.98 mm
  • Foil current: 0.002-0.0025 nA
  • Arc current: 50 μA
  • Gas source: 0.6 cc/min
ADC 0 079
-900 ST 167 (on the Bragg peak) ADC 080 ~25 events in peak
-900 ST 169 ADC 081 ~25 events in peak
-900 ST 171 ADC 082 ~25 events in peak
-900 ST 173 ADC 083 ~25 events in peak
-900 ST 175 ADC 084 ~25 events in peak
-900 ST 176 ADC 082 ~23 events in peak
-900 ST 165 ADC 086 ~23 events in peak
-900 ST 162 ADC 087 ~25 events in peak
-900 ST 158 ADC 088 ~200 events in peak
-900 ST 160 ADC 089 ~100 events in peak
-900 ST 155 ADC 090 ~1,000 events in peak
-900 ST 151 ADC 091 ~700 events in peak
-900 ST 145 ADC 092 ~900 events in peak
BEAM OFF.
Integrated dose: Dose A: 2.0 MU. Dose B: 2.1 MU.
Total beam time run: 45.39 min.
BEAM ON.
-900 ST 140 ADC 093 ~1,000 events in peak
-900 ST 130 ADC 094 ~1,000 events in peak
-900 ST 120 ADC 095 ~1,000 events in peak
-900 ST 110 ADC 096 ~1,000 events in peak
-900 ST 100 ADC 097 ~1,200 events in peak
-900 ST 80 ADC 098 ~1,500 events in peak
-900 ST 60 ADC 099 ~1,200 events in peak
-900 ST 40 ADC 100 ~1,500 events in peak
-900 ST 20 ADC 101 ~1,500 events in peak
-900 ST 0 ADC 102 ~1,500 events in peak
BEAM OFF.
Integrated dose: Dose A: 0.2 MU. Dose B: 0.2 MU.
Total beam time run: 27.71 min.


Neutron measurements

Neutron measurements taken using the large hexagonal scintillator block with 8" PMT (Hex module).

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