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TREX-DM: a low-background Micromegas-based TPC for low-mass WIMP detection.

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TREX-DM utilizes a novel gas Time Projection Chamber (TPC) with Micromegas technology to detect low-mass Weakly Interacting Massive Particles (WIMPs). This advanced detector aims to surpass current experimental limits in the search for dark matter.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Experimental Nuclear Physics

Background:

  • Current dark matter searches face challenges with low-mass Weakly Interacting Massive Particles (WIMPs) due to experimental energy thresholds.
  • Gas Time Projection Chambers (TPCs) offer potential for lower thresholds and versatile target selection.
  • Advances in radiopure materials and micro-mesh gas structure (Micromegas) enhance TPC capabilities for low-background experiments.

Purpose of the Study:

  • To present TREX-DM, a prototype Micromegas-based TPC designed for the detection of low-mass WIMPs.
  • To evaluate the feasibility and sensitivity of this TPC technology for dark matter detection.
  • To explore potential improvements in WIMP detection beyond current experimental limits.

Main Methods:

  • Development and testing of the TREX-DM prototype, a gas TPC employing Micromegas technology.
  • Detector operation with Argon or Neon gas at 10 bar, achieving an energy threshold below 0.4 keVee.
  • Utilizing radiopure materials throughout the detector construction to minimize background noise.

Main Results:

  • Successful commissioning of the TREX-DM prototype on the surface.
  • Development of a preliminary background model for the detector.
  • Anticipated sensitivity potentially exceeding current limits for WIMPs in the 2-8 GeV mass range.

Conclusions:

  • Micromegas-based gas TPCs represent a promising technology for searching for low-mass WIMPs.
  • The TREX-DM prototype demonstrates the potential for achieving very low energy thresholds and good scalability.
  • This approach could significantly advance dark matter detection capabilities.