Development of THGEM-based Photon Detectors for COMPASS RICH-1

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• 作者：M. Alexeev ; R. Birsa ; F. Bradamante ; A. Bressan ; M. Chiosso ; P. Ciliberti ; S. Dalla Torre ; O. Denisov ; V. Duic ; M. Finger ; M. Finger Jr. ; H. Fischer ; M.Giorgi ; B. Gobbo ; M. Gregori ; F. Herrmann ; K.K. ?nigsmann ; D. Kramer ; S. Levorato ; A. Maggiora ; et al.
• 关键词：COMPASS ; Photon detectors ; RICH ; Cherenkov detectors ; THGEM ; MPGD ; CsI
• 刊名：Physics Procedia
• 出版年：2012
• 出版时间：2012
• 年：2012
• 卷：37
• 期：Complete
• 页码：781-788
• 全文大小：259 K

文摘

An R&D project is presented, aimed to develop a high performance gaseous detector of single photons, for the upgrade of the Ring Imaging Cherenkov Counter RICH-1 of the COMPASS Experiment at CERN SPS. The detector has to stably operate at high gain and high rate, to provide good time resolution and insensitivity to magnetic ?eld, and to offer the possibility to cover very large areas at affordable cost. The proposed solution is based on the use of a novel and robust electron multiplier, the Thick GEM (THGEM), arranged in a multilayer architecture, where the ?rst layer is coated with a photosensitive CsI ?lm. A systematic study of the response of THGEMs with various geometrical and production parameters and in different conditions was performed, leading to the choice of a set of optimal parameters. Prototypes of THGEM-based photon detectors able to efficiently detect Cherenkov photons have been built, tested in laboratory and operated in test beam exercises with typical gain of 10⁵ and time resolution better than 10 ns. The engineering aspects of building large area (600¡Á600 mm²) THGEM-based photon detectors are presently being investigated.