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 |