  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.
