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Dark Matter experiments are recently focusing their detection techniques inlow-mass WIMPs, which requires the use of light elements and low energythreshold. In this context, we describe the TREX-DM experiment, a lowbackground Micromegas-based TPC for low-mass WIMP detection. Its main goal isthe operation of an active detection mass $\sim$0.3 kg, with an energythreshold below 0.4 keVee and fully built with previously selected radiopurematerials. This work describes the commissioning of the actual setup situatedin a laboratory on surface and the updates needed for a possible physics run atthe Canfranc Underground Laboratory (LSC) in 2016. A preliminary backgroundmodel of TREX-DM is also presented, based on a Geant4 simulation, thesimulation of the detector's response and two discrimination methods: aconservative muon/electron and one based on a neutron source. Based on thisbackground model, TREX-DM could be competitive in the search for low-massWIMPs. In particular it could be sensitive, e.g., to the low-mass WIMPinterpretation of the DAMA/LIBRA and other hints in a conservative scenario.

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