The operation of a Micropattern Gaseous Detector (MPGD) comprising a cascade of two non-standard Gas Electron Multipliers (GEM) made from a 100 micrometer kapton foil was evaluated in pure krypton and in krypton-CO2 mixtures. The final avalanche charge was collected in a 2D strip readout, providing an active area of 10x10 cm2 for the entire detection system. For each mixture, the effective gain and energy resolution were measured as a function of the electric field in the drift, transfer and induction regions. Using X-rays from a 55Fe radioactive source (5.9 keV), gains close to 104 and energy resolution of 22% (FWHM) were achieved in pure krypton under stable conditions, showing the potential of the experimental setup for the following imaging studies.
@article{arxiv.1801.03729,
title = {Gain characteristics of a 100 micrometer thick GEM in Krypton-CO2 mixtures},
author = {R. C. Roque and H. Natal da Luz and L. F. N. D. Carramate and C. D. R. Azevedo and J. A. Mir and F. D. Amaro},
journal= {arXiv preprint arXiv:1801.03729},
year = {2018}
}