CPC Seminar: The NEWS-G light Dark Matter search experiment: Calibration techniques and physics results from a 10 day exposure with pure methane gas

  • July 10, 2023, 2:00 pm US/Central
  • Curia II
  • Daniel Durnford, University of Alberta
  • Host: Dylan Temples, dtemples@fnal.gov

Abstract: The NEWS-G direct detection dark matter search experiment uses spherical proportional counters (SPCs) with light noble gasses to search for low mass WIMP-like dark matter. The current iteration of the experiment consists of a large 140 cm diameter SPC installed at SNOLAB – benefiting from a new sensor design, improvements in detector performance, and data analysis techniques. Before its installation at SNOLAB, the detector was operated with 135 mbar of pure methane gas at the Laboratoire Souterrain de Modane inside a temporary water shield, which offered a hydrogen-rich target and reduced backgrounds. We present results from a 10-day physics campaign in these conditions, including calibrations of the detector response down to the single ionization regime. We also present details about the installation of the experiment at SNOLAB and other future projects of the NEWS-G collaboration.