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

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.	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	31 (~1.2 GB)
-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			0	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
-900	ST			0	Same position the calibration wheel was.	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

Day 2 (August 3rd)

Scope 2: LeCroy HDO6104 [1], Datasheet Template:PDFlink