Abstract
The TREX-DM experiment is conceived to look for low mass WIMPs by means of a gas time projection chamber equipped with novel micromegas readout planes at the Canfranc Underground Laboratory. The detector can hold 20 l of pressurized gas up to 10 bar, which corresponds to 0.30 kg of Ar, or alternatively, 0.16 kg of Ne. The micromegas will be read with a self-triggered acquisition, allowing for effective thresholds below 0.4 keV (electron equivalent). The preliminary background model, following a complete material screening program, points to levels of the order of 1-10 counts keV−1 kg−1 d−1 in the region of interest, making TREX-DM competitive. The status of the commissioning, description of the background model and the corresponding WIMP sensitivity will be presented here.
Highlights
Looking for low mass WIMPs which could be pervading the galactic dark halo requires the use of light elements as target and detectors with very low energy threshold and very low radioactive background
The experiment has been approved by the Canfranc Underground Laboratory (LSC) in Spain and is expected to be installed underground by the end of 2017
The detector set-up and performance are described in section 2, while the background model developed and the corresponding sensitivity for WIMP direct detection are discussed in sections 3 and 4
Summary
Looking for low mass WIMPs which could be pervading the galactic dark halo requires the use of light elements as target and detectors with very low energy threshold and very low radioactive background. The detector set-up and performance are described, while the background model developed and the corresponding sensitivity for WIMP direct detection are discussed in sections 3 and 4.
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