Title :
GEM-MIGAS Electron Multiplier Operation in Argon-Methane Mixtures
Author :
Conceição, Ana Sofia ; Maia, Jorge M. ; Mir, Jamil A. ; Fernandes, Luis M P ; Dos Santos, Joaquim M F
Author_Institution :
Phys. Dept., Univ. of Coimbra, Coimbra, Portugal
Abstract :
A Gas Electron Multiplier with a Micro-Induction Gap Amplifying Structure (GEM-MIGAS) is formed when a conventional GEM is operated with a short induction gap, typically 50 mum. A three-dimensional electric field simulation of a GEM-MIGAS detector was performed in order to evaluate the electric field profile in the different regions of the structure. Different electrostatic conditions were undertaken to forecast the detector performance in gas medium. An experimental study of GEM-MIGAS operating in an Ar/CH4 (90/10%) gas mixture, in pure CH4 and in pure Ar was carried out. Performance characteristics including charge gain and energy resolution for 5.9 keV X-rays are presented.
Keywords :
electric fields; electron multiplier detectors; position sensitive particle detectors; 3D electric field simulation; CH4; GEM-MIGAS detector; GEM-MIGAS electron multiplier operation; argon-methane mixtures; electric field profile; gas electron multiplier; microinduction gap amplifying structure; Anodes; Argon; Copper; Detectors; Electron multipliers; Energy resolution; Instruments; Physics; Strips; Voltage; GEM detectors; Gas detectors; micropattern gas chambers;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2009.2026646
