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We study the performance of single- and double- THick Gas Electron Multiplier(THGEM) detectors in pure Hydrogen and Deuterium at low pressures, in the rangeof 100-450 Torr. The effect of the pressure on the maximum achievable gain,ion-back flow and long-term gain stability are investigated for single anddouble cascade detectors. In particular, it was found that maximum achievablegains above 10^4, from single-photoelectrons avalanche, can be achieved forpressures of 200 Torr and above; for lower pressure the gains are limited byavalanche-induced secondary effects to a values of around 103. The results ofthis work are relevant in the field of avalanche mechanism in low-pressure,low-mass noble gases, in particular for applications of THGEM end-cap readoutfor active-target Time Projection Chambers (TPC) in the field of nuclearphysics and nuclear astrophysics.

Studies of THGEM-based detector at low-pressure Hydrogen/Deuterium, for AT-TPC applications