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The Spherical gaseous detector (or Spherical Proportional Counter, SPC) is anovel type of par- ticle detector, with a broad range of applications. Its mainfeatures include a very low energy threshold independent of the volume (due toits very low capacitance), a good energy resolution, robustness and a singledetection readout channel, in its simplest version. Applications range fromradon emanation gas monitoring, neutron flux and gamma counting andspectroscopy to dark matter searches, in particular low mass WIMPs and coherentneutrino scattering measure- ment. Laboratories interested in these variousapplications share expertise within the NEWS (New Experiments With Sphere)network. SEDINE, a low background prototype installed at underground site ofLaboratoire Souterrain de Modane is currently being operated and aims atmeasuring events at very low energy threshold, around 100 eV. We will presentthe energy cali- bration with 37Ar, the surface background reduction, themeasurement of detector background at sub-keV energies, and show anticipatedsensitivities for light dark matter search.

Background optimization for a new spherical gas detector for very light WIMP detection