The Mu2e electromagnetic calorimeter is composed of un-doped CsI crystals coupled to large area Silicon Photomultipliers. A modular and custom SiPM layout consisting of a 3x2 array of 6x6 mm2 UV-extended monolithic SiPMs has been developed to fulfill the Mu2e calorimeter requirements. After a preliminary testing phase on pre-production prototypes, Hamamatsu has been selected as vendor and the production of 4000 devices is ongoing. A detailed Quality Assurance (QA) process is being carried out on each device using an automatized test station able to measure the breakdown voltage, the gain and the dark current at three temperatures (-10° C, 0° C and 20° C) and under vacuum. Up to 20 SiPMs can be characterized at the same time. We present the design of the test station and the measurement techniques, as well as a summary of the results obtained from the first tested batches of photosensors.
Automated test station for the characterization of custom silicon photomultipliers for the Mu2e calorimeter
Caiulo D.;Di Falco S.;Donati S.;Lucchesi L.;Morescalchi L.
;Pasciuto D.;Pedreschi E.;Spinella F.;Cordelli M.;Pezzullo G.
2018-01-01
Abstract
The Mu2e electromagnetic calorimeter is composed of un-doped CsI crystals coupled to large area Silicon Photomultipliers. A modular and custom SiPM layout consisting of a 3x2 array of 6x6 mm2 UV-extended monolithic SiPMs has been developed to fulfill the Mu2e calorimeter requirements. After a preliminary testing phase on pre-production prototypes, Hamamatsu has been selected as vendor and the production of 4000 devices is ongoing. A detailed Quality Assurance (QA) process is being carried out on each device using an automatized test station able to measure the breakdown voltage, the gain and the dark current at three temperatures (-10° C, 0° C and 20° C) and under vacuum. Up to 20 SiPMs can be characterized at the same time. We present the design of the test station and the measurement techniques, as well as a summary of the results obtained from the first tested batches of photosensors.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
