Author/Authors :
Mir، نويسنده , , J.A. and Stephenson، نويسنده , , R. and Rhodes، نويسنده , , N.J and Schooneveld، نويسنده , , E.M. and Natal da Luz، نويسنده , , H. and Veloso، نويسنده , , J.F.C.A. and dos Santos، نويسنده , , J.M.F. and Azevedo، نويسنده , , C.D.R.، نويسنده ,
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 μm 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.
Keywords :
Gas electron multiplier , GEM , GEM-MIGAS , Effective gain , X-ray energy resolution
