Application of the multichannel front-end chip for SiPM based gamma detectors
Chergui А., Popova E.V., Stifutkin A.A.
National research Nuclear University MEPHI ( Moscow Engineering Physics Institute)
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Silicon Photomultiplier (SiPM) is a modern photosensorwhich is widely used in different fields of science and technology. When coupled with a scintillator crystal it can serve as a gamma-detector. However, building of multichannel systems based on very popular scintillators such as NaI(Tl) and CsI(Tl) is difficult due to lack of the multichannel front-end chips designed for use with those "slow" crystals.
A prototype of such chip was designed and manufactured in NRNU MEPhI, Department of Microelectronics (N27). The chip is configurable and each channel includes an input linear amplifier, an integrator, slow and fast shapers, a discriminator, a peak-detector and controlling electronics.
In addition, a test-board for the chip evaluation was build and special control software was developed.
The evaluation board was connected to a detector module which consists from a NaI(Tl) crystal and SiPM matrix and the system energy resolution for a number of gamma-sources was measured.