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

High voltage (V)	Trigger	Rate & additional information	Collimator size & beam information	PMMA thickness (mm)	Data recorded	Run number	Comments
BEAM ON. Dose monitor operation reset.
-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

Day 2 (August 3rd)

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