Abstract
The NEWS-G collaboration is searching for light dark matter candidates using a novel detector concept, the spherical proportional counter. Access to the mass range from 0.05 − 10 GeV is enabled by the combination of low energy threshold, light gaseous targets (H, He, Ne), and highly radio-pure detector construction. Initial NEWS-G results obtained with SEDINE, a 60 cm in diameter spherical proportional counter operating at LSM (France), excluded for the first time WIMP-like dark matter candidates down to masses of 0.5 GeV. NEWS-G has now constructed a 140 cm in diameter, spherical proportional counter using 4N copper with a 500 m electroplated inner layer. The detector is currently being commissioned in SNOLAB. The detector will use a read-out technology incorporating resistive materials and multiple anodes, which enable high gain and high-pressure operation. Future NEWS-G detectors which will be fully electroformed underground are also being designed.
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