Proton Calorimetry/Experimental Runs/2017/September7

Beam tests of the Nuvia 10 mm, 4 mm and 3 mm scintillator sheets with PRaVDA CMOS pixel sensors (PRIAPUS) at the Birmingham Cyclotron with a 28 MeV beam.

Pre-data Taking Information and Notes

• The tests were carried out with an energy of 28 MeV (32 MeV was unavailable as the cyclotron had recently been through repairs). No Bragg Peak measurement was carried out to confirm the exact beam energy due to time restrictions.
• The beam was run without a scattering foil. A 1 cm diameter uniform beam was achieved by placing a 1 cm collimator in the beam, with a beam scan onto film confirming the size. An ionisation chamber was placed upstream of the collimator to accurately monitor the current.
• The dynamic range of the CMOS sensors is 14 bits. The electron conversion value from ADC is 50 electrons per ADC value. The measurements to establish this were carried out at the beginning of experimentation with the sensors and this value may have changed due to radiation damage etc.
• From previous measurements, the average background value per pixel is ~ 700.