Searching for WIMPs with TREX-DM: achievements and challenges
Journal of Instrumentation(2023)
摘要
The TREX-DM detector, a low background chamber with microbulk Micromegas
readout, was commissioned in the underground laboratory of Canfranc (LSC) in
2018. Since then, data taking campaigns have been carried out with Argon and
Neon mixtures, at different pressures from 1 to 4 bar. By achieving a low
energy threshold of 1 keV$_{ee}$ and a background level of 80 counts keV$^{-1}$
Kg$^{-1}$ day$^{-1}$ in the region from 1 to 7 keV$_{ee}$, the experiment
demonstrates its potential to search for low-mass WIMPs. Two of the most
important challenges currently faced are the reduction of both, background
level and energy threshold. With respect to the energy threshold, recently a
new readout plane is being developed, based on the combination of Micromegas
and GEM technologies, aiming to have a pre-amplification stage that would
permit very low energy thresholds, close to the single-electron ionization
energy. With respect to the background reduction, apart from studies to
identify and minimize contamination population, a high sensitivity alpha
detector is being developed in order to allow a proper material selection for
the TREX-DM detector components. Both challenges, together with the
optimization of the gas mixture used as target for the WIMP detection, will
take TREX-DM to explore regions of WIMP's mass below 1 GeV c$^{-2}$.
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