Abstract
Negative-ion time projection chambers (NITPCs) provide the absolute z-position from the arrival-times’ difference of several species of negative-ions. This is a strong background reduction method for rare event searches, such as direct dark mater searches. The characteristics of micro pattern gaseous detectors (MPGDs) in negative-ion gas were studied by both experiments and simulations to develop an NITPC for dark matter search experiments. An MPGD simulation method for the negative-ion gas with Garfield++, which has not yet been established, was developed. We present herein the MPGD simulation results in negative-ion gas, SF6 gas, together with the experimental results, such as gain, energy resolution, and signal creation from the MPGD for future NITPC optimization.
Highlights
Many pieces of evidence support the existence of dark matter in the universe
Three methods can be used to search for weakly interacting massive particles (WIMPs): direct, indirect and collider experiments
Direct detection aims to catch the signal of nuclear recoil by the WIMPs
Summary
Many pieces of evidence support the existence of dark matter in the universe. One of the most attracting candidates is weakly interacting massive particles (WIMPs). Gas gains of up to 6,000 were obtained with SF6 at 100 Torr in the double-GEM measurement (Fig.2a). Gas gains of up to 10,000 for 60 to 120 Torr were obtained in the triple GEM measurement (Fig.2b). (a) Double GEM gas gain at 100 Torr pure SF6
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