First observation of Cherenkov rings with a large area CsI-TGEM-based RICH prototype

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• 作者：V. Peskovp>ap>p> ; p>p>bp>p> ; p>p>Vladimir.peskov@cern.chp> ; G. Benczep>ap>p> ; p>p>cp> ; A. Di Maurop>ap> ; P. Martinengop>ap> ; D. Mayanip>bp> ; L. Molnarp>ap>p> ; p>p>cp> ; E. Nappip>dp> ; G. Paicp>bp> ; N. Smirnovp>ep> ; H. Anandp>fp> ; I. Shuklap>gp>
• 关键词：RICH ; TGEM ; CsI ; MPGD
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2012
• 出版时间：11 December, 2012
• 年：2012
• 卷：695
• 期：Complete
• 页码：154-158
• 全文大小：754 K

文摘

We have built a RICH detector prototype consisting of a liquid C₆F₁₄ radiator and six triple Thick Gaseous Electron Multipliers (TGEMs), each of them having an active area of 10¡Á10 cmp>2p>. One triple TGEM has been placed behind the liquid radiator in order to detect the beam particles, whereas the other five have been positioned around the central one at a distance to collect the Cherenkov photons. The upstream electrode of each of the TGEM stacks has been coated with a 0.4 ¦Ìm thick CsI layer.<p>In this paper, we will present the results from a series of laboratory tests performed with this prototype carried out using UV light, 6 keV photons from p>55p>Fe and electrons from p>90p>Sr as well as recent results of tests with a beam of charged pions where for the first time Cherenkov Ring images have been successfully recorded with TGEM photodetectors. The achieved results prove the feasibility of building Cherenkov detector based on CsI coated TGEMs.