Proton Calorimetry/Experimental Runs/2018/Mar8-9

Beam tests of the UCL plastic scintillator range calorimeter.

Thursday 8th of March 2018

Pre-data Taking Information and Notes

• The tests were carried out with an energy of 36 MeV. A Bragg Peak measurement was carried out to confirm the exact beam energy.
• Collimators used: 2 mm and 20 mm diameter.
• PMMA sheets used: 3 mm.
• The average background value per pixel for the sensor is ~ 2500. The sensor pixel dimensions are 1030 x 1536. The sensor frame rate was always set to 25 frames per second.
• The DSLR ISO was always set to 200.
• 6 x 3 mm scintillator sheets were used. The scintillator stack was set up in the following order, starting with the first sheet facing the beam:
  • 31, 32, 33, 34, 35, 48
• The scintillator stack was coupled to the sensor using optical gel.
• The dose received (as shown on the monitor in the control room) during the full day of measurements was:
  • With a 2 mm collimator: 746.9 uC
  • With a 20 mm collimator: 417.7 uC
  • With a 2 mm collimator + 3 mm of PMMA: 251.5 uC
• To calculate the actual dose delivered to the scintillator:
  • / 160 -> to convert to proton current
  • / (50/ collimator diameter)^2 -> to account for reduction in area due to the collimator
• The directory containing the sensor data is:

/unix/pbt/data/birmingham/mar_2018/EPIX/XCAP/data/20180308_bham

• The directory containing the DSLR data is:

/unix/pbt/data/birmingham/mar_2018/Nikon/20180308_bham

Data Taking

Run number	DSLR Aperture	DSLR Exposure	Sensor Full Well Mode	Sensor Sequence	Beam Energy	Current on Monitor	Collimator Diameter	Comments	DSLR Thumbnail	Sensor Thumbnail
1	f/10	2 s	N/A	N/A	N/A	N/A	N/A	Beam off, lid open. Focus check for DSLR. Low light.		N/A
2	f/10	5 s	N/A	N/A	N/A	N/A	N/A	Beam off, lid open. Focus check for DSLR. Low light.		N/A
3	f/10	20 s	N/A	N/A	N/A	N/A	N/A	Beam off, lid open. Focus check for DSLR. Low light.		N/A
4	f/10	20 s	N/A	N/A	N/A	N/A	N/A	Beam off, lid open. Focus check for DSLR. Focus - okay.		N/A
5	f/5	5 s	N/A	N/A	N/A	N/A	N/A	Beam off, lid open. Focus check and background picture with white paper for DSLR.		N/A
6	f/10	5 s	Low	42 frames	N/A	N/A	N/A	Beam off, lid closed, lights off. Background run.		N/A
7	f/3.2	2 s	Low	21 frames	N/A	N/A	N/A	Beam off, lid closed, lights off. Background run.		N/A
8	f/3.2	10 s	Low	21 frames	36 MeV	1 uA	2 mm	Beam on.		N/A
9	N/A	N/A	Low	21 frames	36 MeV	1 uA	2 mm	Beam on.	N/A	N/A
10	f/3.2	10 s	Low	1 frame	36 MeV	0.8 uA	2 mm	Beam on.
11	f/3.2	10 s	Low	21 frames	36 MeV	0.8 uA	2 mm	Beam on.		N/A
12	f/3.2	10 s	Low	21 frames	36 MeV	10 nA	20 mm	Beam on.
13	f/3.2	10 s	Low	21 frames	36 MeV	20 nA	20 mm	Beam on. At this current sensor is saturated on low full well mode.
14	f/3.5	10 s	N/A	N/A	36 MeV	50 nA	20 mm	Beam on.		N/A