Single-electron response and energy resolution of a Micromegas detector

被引：22

作者：

Zerguerras, T. ^{[1
]}

Genolini, B. ^{[1
]}

Lepeltier, V. ^{[2
]}

Peyre, J. ^{[1
]}

Pouthas, J. ^{[1
]}

Rosier, R. ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, IN2P3, Inst Phys Nucl UMR 8608, F-91406 Orsay, France

[2] Univ Paris 11, CNRS, IN2P3, LAL, F-91406 Orsay, France

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2009年 / 608卷 / 03期

关键词：

Gaseous detectors; Micromegas; Single-electron; Fano factor; Energy resolution; FANO FACTOR; PROPORTIONAL-COUNTERS; GASEOUS DETECTOR; COUNTING GASES; MEAN ENERGY; ION-PAIR; ARGON; GEM; IONIZATION; MIXTURES;

D O I：

10.1016/j.nima.2009.07.015

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Micro-Pattern Gaseous Detectors (MPGDs) such as Micromegas or GEM are used in particle physics experiments for their capability of particle tracking at high rates. Their excellent position resolutions are well known but their energy characteristics have been less studied. The energy resolution is mainly affected by ionisation processes and gain fluctuations. This paper presents a method to separately measure these two contributions to the energy resolution of a Micromegas detector. The method relies on the injection of a controlled number of primary electrons in the gas. The Micromegas has a 1.6-mm drift zone and a 160-mu m amplification gap. It is operated in Ne 95%-iC(4)H(10) 5% at atmospheric pressure. The electrons are generated by non-linear photoelectric emission derived from the photons of a pulsed 337-nm wavelength laser coupled to a focusing system. The single-electron response has been measured at different gains (3.7 x 10(4), 5.0 x 10(4) and 7.0 x 10(4)) and is fit with good agreement by a Polya distribution. From those fits, a relative gain variance of 0.31 +/- 0.02 is deduced. The setup has also been characterised at several voltages by fitting the energy resolution measured as a function of the number of primary electrons, ranging from 5 to 210. An upper limit on the Fano factor (0.37) has been estimated for 5.9 keV X-rays absorbed in a Ne 95%-iC(4)H(10) 5% gas mixture. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：397 / 402

页数：6

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