Physics of multi-GEM structures

Details Physics of multi-GEM structures Physics of multi-GEM structures

2002-06-25

arxiv.org/abs/physics/0206082v2

Nucl.Instrum.Meth. A494 (2002) 148-155

Physics

Instrumentation and Detectors

Presented at the 8th International Conference on Instrumentation for Colliding Beam Physics, Novosibirsk, Febuary 28 - March 6

Scientific paper

10.1016/S0168-9002(02)01458-4

We show that physics of multi-GEM structures is rather complex, regarding the number of phenomena affecting detector performance. The high-pressure operation in noble gases and the ion feedback are considered in more detail. It is proposed that the dominant avalanche mechanism in He and Ne, at high pressures, is the associative ionization. Ion feedback effects related to the dependence on gas, pressure and gain and to possible avalanche extension outside the GEM holes are discussed.

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