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Advances in High Energy Physics
Volume 2016, Article ID 8561743, 8 pages
Research Article

Analytic Approximation of Energy Resolution in Cascaded Gaseous Detectors

Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics of the HAS, 29-33 Konkoly-Thege Miklós Street, Budapest 1121, Hungary

Received 3 February 2016; Accepted 28 March 2016

Academic Editor: Ming Liu

Copyright © 2016 Dezső Varga. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


An approximate formula has been derived for gain fluctuations in cascaded gaseous detectors such as Gas Electron Multipliers (GEMs), based on the assumption that the charge collection, avalanche formation, and extraction steps are independent cascaded processes. In order to test the approximation experimentally, a setup involving a standard GEM layer has been constructed to measure the energy resolution for 5.9 keV gamma particles. The formula reasonably traces both the charge collection and the extraction process dependence of the energy resolution. Such analytic approximation for gain fluctuations can be applied to multi-GEM detectors where it aids the interpretation of measurements as well as simulations.