1. The gain in Thick GEM multipliers and its time-evolution
- Author
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M. Büchele, L. Steiger, G. Sbrizzai, F. Tessarotto, M. Gregori, M.G. Alexeev, D. Panzieri, K. Königsmann, F. A. Pereira, A. Maggiora, M. Chiosso, K. Novakova, S. Levorato, G. Menon, S. Takekawa, Franco Bradamante, O. Y. Denisov, B. Gobbo, S. Dalla Torre, P. Schiavon, J. Novy, Federica Sozzi, Miroslav Sulc, S. Schopferer, Andrea Bressan, M. Finger, Nour Makke, François Herrmann, Alan D. Martin, H. Fischer, Celso Augusto Guimarães Santos, J.F.C.A. Veloso, R. Birsa, V. Duic, P. Ciliberti, M. Slunečka, S. Dasgupta, Alexeev, M., Birsa, Renato, Bradamante, Franco, Bressan, Andrea, Büchele, M., Chiosso, M., Ciliberti, Piero, Torre, S. Dalla, Dasgupta, SHUDDHA SHANKAR, Denisov, O., Duic, Venicio, Finger, M., Fischer, H., Gobbo, Benigno, Gregori, M., Herrmann, F., Königsmann, K., Levorato, Stefano, Maggiora, A., Makke, Nour, Martin, Anna, Menon, G., Novakova, K., Novy, J., Panzieri, D., Pereira, F. A., Santos, C. A., Sbrizzai, Giulio, Schiavon, Paolo, Schopferer, S., Slunecka, M., Sozzi, Federica, Steiger, Luka, Sulc, M., Takekawa, Stefano, Tessarotto, Fulvio, and Veloso, J. F. C. A.
- Subjects
Physics ,Photon ,Physics::Instrumentation and Detectors ,business.industry ,Particle tracking detectors (Gaseous detectors) ,Detector ,Time evolution ,Electron ,Particle detector ,Photon detectors for UV, visible and IR photons (gas) ,Instrumentation ,Mathematical Physics ,Upgrade ,Optics ,Measuring instrument ,Gas electron multiplier ,visible and IR photons (gas) ,business ,Photon detectors for UV - Abstract
In the context of a project to upgrade the gas photon detectors of COMPASS RICH-1, we have performed an R&D programme aimed to develop photon detectors based on multi-layer arrangements of thick GEM electron multipliers coupled to a CsI photoconverter. For this purpose, thick GEMs have been characterised in detail including the gain performance, its dependance on the geometrical parameters and its time-evolution, a feature exhibited by the gas detectors with open insulator surfaces. The variation due to this evolution drammatically depends on the parameters themselves. In the present article we summarise the outcomes of the studies dedicated to the thick GEM gain and its evolution versus time. We also include a qualitative model which accounts for the peculiar details of the observed thick GEM gain time-evolution.
- Published
- 2015
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