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Title: Further studies on the gain properties of a Gas Electron Multiplier with a Micro-Induction Gap Amplifying Structure (GEM-MIGAS) aimed at low-energy X-ray detection
Authors: Mir, J. A. 
Stephenson, R. 
Rhodes, N. J. 
Schooneveld, E. M. 
Luz, H. Natal da 
Veloso, J. F. C. A. 
Santos, J. M. F. dos 
Azevedo, C. D. R. 
Keywords: Gas electron multiplier; GEM-MIGAS; Effective gain; X-ray energy resolution
Issue Date: 2007
Citation: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 580:3 (2007) 1372-1377
Abstract: A Gas Electron Multiplier with Micro-Induction Gap Amplifying Structure (GEM-MIGAS) is formed when the induction gap of the GEM is set between 50 and 100 [mu]m using kapton pillars spaced at regular intervals. This configuration combines the properties of a GEM and Micromegas, allowing operation in tandem to generate high charge gains. We measured the essential operational parameters of this system using argon-isobutane (IB) and helium-IB gas mixtures. The present short induction gap GEM was able to achieve effective gains exceeding 2×104 using argon-IB and 105 using helium-IB mixtures. In view of the high gains achieved, particularly when using helium-based gas mixtures, these studies confirmed the possibility of using the present system for high-performance sub-keV X-ray detection.
DOI: 10.1016/j.nima.2007.07.004
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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