Abstract
Negative-ion time projection chambers(TPCs) have been studied for low-rate and high-resolution applications such as dark matter search experiments. Recently, a full volume fiducialization in a self-triggering TPC was realized. This innovative technology demonstrated a significant reduction in the background with MWPC-TPCs. We studied negative-ion TPC using the μ-PIC+GEM system and obtained sufficient gas gain with CS2 gas and SF6 gas at low pressures. We expect an improvement in detector sensitivity and angular resolution with better electronics.
Highlights
Interacting massive particles(WIMPs) are one of the candidates for dark matter
Since spatial and angular resolutions are deteriorated by diffusion, the drift length is limited to several tens of cm with electron-drift detectors[2]
Micro-pattern gaseous detectors(MPGDs) are known to have strong electric fields and would be a suitable device to use with SF6 as a TPC gas
Summary
Interacting massive particles(WIMPs) are one of the candidates for dark matter. Among the various direct search experiments, the detection of nuclear recoil tracks is thought to provide strong evidence of dark matter detection. Gas detectors are among the possible nuclear track detection methods, and several groups have developed detectors and performed underground directionsensitive dark matter searches[1,2,3,4,5]. Since the expected event rate is extremely low, a dark matter detector needs to be large(cubic-meter scale).
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