In January 2019 our team has performed irradiation tests on the GAGG scintillator crystal that will be used in the X- and γ-ray detector on board HERMES-SP. The tests have been performed in the research room of the Trento Proton Therapy Centre of TIFPA.
The pictures show the GAGG(Ce) crystals and the experimental setup.
GAGG scintillator cristal
The GAGG(Ce) crystals that will be used in the HERMES-SP detectors.
The experiment chassis in our lab at University of Udine. The scintillator crystal is not present in this photo. The PMTs are located on the two small sides of the scintillator, to be housed in the centre of the box. PMTs can be used in coincidence or on their own, respectively for detecting scintillation events – which producing a multitude of photons are simultaneously observed on both – and singularly.
The experimental setup as seen in the research room of the Trento Proton Therapy Centre, just before the first irradiation run. The proton beam leaves the tube on the background, reaches a Mini-Q monitor and finally finds the experiment’s chassis entrance. Cyclotron magnets focus the beam along radial and vertical direction and are here visible just before the nozzle. Between the nozzle and the experiment chassis lies the Mini-q monitor, a segmented ionization chamber used for aquiring information about proton beam intensity and shape during irradiation runs. On the background lies the experiment’s chassis.
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