Test and characterization of SiPMs for the upgrade of MEGII high resolution Timing Counter

被引：0
|
作者：
Rossella, M. [1 ]
Cattaneo, P. W. [1 ]
de Bari, A. [2 ]
Boca, G. [2 ]
Prata, M. C.
de Vecchi, C.
Boffelli, F. [1 ,2 ]
Nardo, R.
Barnaba, O. [1 ,2 ]
机构：
[1] INFN, Sez Pavia, Via Bassi 6, I-27100 Pavia, Italy
[2] Univ Pavia, Dipartimento Fis, Via Bassi 6, I-27100 Pavia, Italy
来源：
JOURNAL OF INSTRUMENTATION | 2024年 / 19卷 / 03期
关键词：
Particle tracking detectors; Photon detectors for UV; visible and IR photons (solid-state) (PIN diodes; APDs; Si-PMTs; G-APDs; CCDs; EBCCDs; EMCCDs; CMOS imagers; etc); Timing detectors;
D O I：
10.1088/1748-0221/19/03/C03004
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The MEG II experiment based at PSI (Zuerich, Switzerland) has been committed and is taking data since 2021 to improve sensitivity on the decay mu(+) -> e(+) gamma. The pixelated Timing Counter (pTC), consisting of two arrays of 512 5 mm thick scintillator pixel each, read out by 6 3x3 mm(2), 50 mu m cell, Silicon Photomultipliers (SiPMs) from AdvanSiD, for a total of 6144 SiPM, achieves an overall resolution in the positron impact time of similar to 43 ps when exploiting multiple measurements. To additionally improve this resolution, 4x4 mm(2), 40 mu m cell SiPMs have been selected to substitute a fraction of the old ones (about 1000 of them overall). By means of an automated test system, a first group of them has been characterized (measuring their breakdown voltage and their I-V curves), to match as much as possible SiPMs with the same gains in each pixel, in order to maximize the pixel time resolution. Such automated test system will be presented, together with some preliminary results on single pixel time resolution and the expectations of the average time resolution of the pTC in the coming years.
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页数：8
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