Comparison of bulk Micromegas with different amplification gaps

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• 作者：Purba Bhattacharya ; Sudeb Bhattacharya ; Nayana Majumdar ; Supratik Mukhopadhyay ; S ; ip Sarkar ; Paul Colas ; David Attie
• 关键词：Bulk Micromegas ; Electron transparency ; Gain ; Energy resolution ; Dielectric spacer
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：21 December, 2013
• 年：2013
• 卷：732
• 期：Complete
• 页码：208-212
• 全文大小：3138 K

文摘

The bulk Micromegas detector is considered to be a promising candidate for building TPCs for several future experiments including the projected linear collider. The standard bulk with a spacing of has already established itself as a good choice for its performances in terms of gas gain uniformity, energy and space point resolution, and its capability to efficiently pave large readout surfaces with minimum dead zone. The present work involves the comparison of this standard bulk with a relatively less used bulk Micromegas detector having a larger amplification gap of . Detector gain, energy resolution and electron transparency of these Micromegas have been measured under different conditions in various Argon-based gas mixtures to evaluate their performance. These measured characteristics have also been compared in detail to numerical simulations using the Garfield framework that combines packages such as neBEM, Magboltz and Heed. Further, we have carried out another numerical study to determine the effect of dielectric spacers on different detector features. A comprehensive comparison of the two detectors has been presented and analyzed in this work.