Proton Calorimetry/Experimental Runs/2018/Mar23

Beam tests of the UCL single module at medAustron.

Friday 23rd - Saturday 24th of March 2018

Pre-data Taking Information and Notes

• The tests were carried out with an energy of 252.7 MeV with a 5 second beam spill and six different beam intensities.
• No collimators were used at any point.
• The setup consisted of:
  • 2" Hamamatsu R13089-100-11 PMT with negative HV active divider base (made by Hamamatsu)
  • coupled with Eljen optical gel to a
  • 3 cm x 3 cm x 45 cm cuboid ENVINET standard scintillator wrapped in two layers 6 um (each) of Mylar
• The "pensioner" 5 dynode stage PMT was also briefly tested, but no sensible data was able to be acquired.
• The digitiser always operated in Self Trigger mode.
• Differences since last medAustron test beam:
  • Short cables used for signals and SMA instead of BNC, controlling the acquisition remotely.
  • Tests carried out at a range of HVs.
• Working directory where digitiser data is stored:

C:\Users\abf\Desktop\digitiser_data\medAustron\mar18\ham

Data Taking

Run number	High Voltage, V	PMT Current, uA	Beam Intensity	Rate (Measured on Digitiser)	Digitiser Settings and Notes
N/A	-900	150.1 (beam off)	N/A	N/A	DC Offset: 0, Rec. Length: 396 ns, Threshold: 40 LSB, Gate Offset: 1 ns, Long Gate: 396 ns, BL Mean: 8 ns, Charge. Sensitivty: 20 fC/LSB, Pre-trigger: 9 ns
001	-900	150.1	Lowest	0.3 - 5 kHz	DC Offset: -30, Threshold: 40 LSB, Gate Offset: 20 ns, Long Gate: 150 ns
002	-800	133.2	Lowest	0.3 - 5 kHz	As above
003	-700	116.35	Lowest	0.3 - 5 kHz	As above
004	-600	99.45	Lowest	0.3 - 5 kHz	Beam dropped during running!
005	-600	99.45	Lowest	0.3 - 5 kHz	Repeat run with beam back.
006	-500	82.6	Lowest	0.3 - 5 kHz	Threshold: 10 LSB. Too close to the threshold, but cannot lower more due to noise floor.
007	-600		Increased by 10 - 15 times of original	5 - 30 kHz	Threshold: 20 LSB
008	-700	116.3	Increased by 10 - 15 times of original	5 - 30 kHz	As above
009	-800	133.2	Increased by 10 - 15 times of original	5 - 30 kHz	As above
010	-900	150.1	Increased by 10 - 15 times of original	5 - 30 kHz	As above
011	-900		Increased by factor of 3 from 2nd intensity	150 - 200 kHz	As above
012	-800	133.2	Increased by factor of 3 from 2nd intensity	150 - 200 kHz	As above
013	-700	116.55	Increased by factor of 3 from 2nd intensity	150 - 200 kHz	As above
014	-600	99.45	Increased by factor of 3 from 2nd intensity	150 - 200 kHz	As above
015	-600		Increased by factor of 2 from 3rd intensity	300 - 340 kHz	As above
016	-700	116.3	Increased by factor of 2 from 3rd intensity	300 - 340 kHz	As above
017	-800		Increased by factor of 2 from 3rd intensity	300 - 340 kHz	As above
018	-900	150.1	Increased by factor of 2 from 3rd intensity	300 - 340 kHz	As above
019	-900		Increased by factor of 2 from 4th intensity	600 - 800 kHz	As above. No sensible peak at this HV.
020	-800	133.2	Increased by factor of 2 from 4th intensity	600 - 800 kHz	As above
021	-700	116.35	Increased by factor of 2 from 4th intensity	600 - 800 kHz	As above
022	-600	99.35	Increased by factor of 2 from 4th intensity	600 - 800 kHz	As above
023	-600		Increased by factor of 2 from 5th intensity	1.2 MHz	As above. Pile up is becoming more apparent.
024	-550	91.25	Increased by factor of 2 from 5th intensity	1.2 MHz	As above
025	-550		Increased by factor of 2 from 5th intensity	1.2 MHz	Threshold: 10 LSB
026	-580	96.1	Increased by factor of 2 from 5th intensity	1.2 MHz	Threshold: 10 LSB
027	-580		Increased by factor of 2 from 5th intensity	1.2 MHz	Threshold: 5 LSB

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End of test beam.