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Results obtained with a triple Gas Electron Multiplier (GEM) detector operated in pure CF 4 with and without a reflective CsI photocathode are presented. The detector operates in a stable mode at gains up to 10 4 . A deviation from exponential growth starts to develop when the total charge exceeds ~4x10 6 e leading to gain saturation when the total charge is ~2x10 7 ...
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