Further studies on the gain properties of a Gas Electron Multiplier with a Micr...

• Author(s): 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.
• Date: 2007
• Persistent ID: http://hdl.handle.net/10316/4348
• Origin: Estudo Geral - Universidade de Coimbra
• Subject(s): Gas electron multiplier; GEM-MIGAS; Effective gain; X-ray energy resolution
• Document Type: Article
• Language: English

Description

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. http://www.sciencedirect.com/science/article/B6TJM-4P61N30-5/1/fb32483bc2ec5006bc9641ac8675ee92