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In view of a possible application as a charge-particle track readout for anActive Target Time Projection Chamber (AT-TPC), the operating properties ofTHick Gaseous Electron Multipliers (THGEM) in pure low-pressure Helium wereinvestigated. This paper includes the effective gain dependence on pressure fordifferent detector configurations (single-, double-, triple-cascade setup),long-term gain stability and energy resolution from tracks of 5.5 MeV alphaparticles. Stable operational conditions and maximum detector gains of10^4-10^7 have been achieved in pure Helium at pressure ranging from 100 torrup to 760 torr. Energy resolution of 6.65% (FWHM) for 690 keV of energydeposited by 5.5 MeV alpha particles at 350 torr was measured. The expectedenergy resolution for the full track is around 2.4% (FWHM). These results,together with the robustness of THGEM electrodes against spark damage, makeTHGEM structures highly competitive compared to other technologies consideredfor TPC applications in an active target operating with pure noble gases,requiring a high dynamic range and a wide operating pressure range down to fewhundred torr.

Operation of a THGEM-based detector in low-pressure Helium