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Novel silicon photomultipliers suitable for dual-mirror small-sized telescopes of the Cherenkov telescope array
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SYSNO ASEP 0538202 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Novel silicon photomultipliers suitable for dual-mirror small-sized telescopes of the Cherenkov telescope array Author(s) Romeo, G. (IT) Number of authors 1 Source Title Nuclear Instruments & Methods in Physics Research Section A. - : Elsevier - ISSN 0168-9002
Roč. 908, Nov (2018), s. 117-127Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords silicon photomultipliers ; detector characterization ; photon detection Subject RIV BF - Elementary Particles and High Energy Physics OECD category Particles and field physics Research Infrastructure CTA-CZ - 90046 - Fyzikální ústav AV ČR, v. v. i. Method of publishing Limited access UT WOS 000446864600015 EID SCOPUS 85052470017 DOI 10.1016/j.nima.2018.08.035 Annotation Many of the characteristics of Silicon Photomultipliers (SiPMs), such as high Photon Detection Efficiency (PDE), are well matched to the requirements of the cameras of the Small-Sized Telescopes (SSTs) proposed for the Cherenkov Telescope Array. In fact, compared to a single mirror, the double mirror Schwarzschild–Couder configuration provides a much better Point Spread Function over a large field of view. It allows better correction of aberrations at large off-axis angles and facilitates the construction of compact telescopes. Moreover, the small plate scale of the dual-mirror SSTs allows the use of SiPM detectors despite their small pixel sizes. These sensors have two further advantages compared to the Photo Multipliers Tubes: the low cost and the possibility to observe in very high Night Sky Background (NSB) light level without any damage. However, one area in which SiPM performance has required improvement is Optical Cross-Talk (OCT), where multiple avalanches are induced by a single impinging photon. OCT, coupled with the typical NSB rate of 25 MCnts/s per pixel during Cherenkov observations, can place severe constraints on the triggering capability of the cameras. This paper describes the performance of novel Low Voltage Reverse (LVR) 2nd and 3rd generation Multi-Pixel Photon Counters manufactured by Hamamatsu Photonics. These are designed to have both enhanced PDE and reduced OCT. Two 7 × 7 mm2 S14520 LVR2 MPPCs with 75μm micro-cells are tested and compared with detectors of the same pixel size with 50μm micro-cells. A comparative analysis of a 3×3 mm2 S14520 LVR2 device and an S14520 LVR3 device is also carried out, demonstrating that the LVR3 gives better photon detection in the 240 – 380 nm wave-length range. Finally, the effect of an infrared filter on the OCT is analysed. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2021 Electronic address https://doi.org/10.1016/j.nima.2018.08.035
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