Welcome to NEWS-G!

SPC prototype made of low activity copper.

Copper SPC Prototype

Originating from a symposium at Thessaloniki in 2012, the NEWS-G (New Experiments With Spheres-Gas) network gathers physicists interested in developing gaseous spherical detectors (or SPC, Spherical Proportional Counter) for multiple particle detection purposes.

The concept was originally put forward by Ioannis Giomataris (IRFU CEA-Saclay), and developed by the Saclay, Thessaloniki and Saragoza teams.

Specific features of these kind of detectors – low capacitance, low threshold, excellent energy resolution, single readout channel in its simplest version, low cost, robustness, flexibility in gas choice and in operating pressure – have led to envisage various applications ranging from Dark Matter detection, Coherent Nuclear Neutrino Scattering study, Double Beta decay search to gamma ray and neutron spectroscopy.

The present web pages are dedicated to setting up a project related to Dark Matter detection, designated NEWS-SNO.

Searching for light Dark Matter particles with NEWS-G

Inner rod and sensor of the spherical gas detector.

Inner Rod and Sensor

An initial 60 cm diameter prototype made of high purity copper has been set-up at the Laboratoire Souterrain de Modane (LSM) by IRFU and LSM teams, initially to measure neutron spectra. Successful operation led to set-up and operation of the detector to search for Dark Matter particles of low mass; preliminary results are very encouraging and are subject to a coming publication .

An enlarged collaboration now seeks to build a 1.4m diameter spherical detector, within a lead shielding. This is to increase the physics reach in the GeV and sub-GeV mass range, thanks in particular to the use of very light nuclei targets like He and H from CH4 or other H rich gas.

The ideal location for operation is SNOLAB, the second deepest and the cleanest underground laboratory in the world.