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Last name: WAYSAND
First name: G.
International audience
The application of Superheated Droplet Detectors in dark matter searches by the SIMPLE project uses an acoustic instrumentation sensitive to the shock wave generated by the bubble nucleation of the refrigerant droplets. Previous instrumentation has been unable to distinguish between true nucleation and background noise events in the device, in...
The former underground lauching control room 1 of the ground based component of the french nuclear missile system has been decommissioned. This installation has been designed and built to remain operational even in case of a near-by nuclear blast. As a result it is robust to radioactive clouds, thermal and mechanical waves as well as...
Recent activity in the SIMPLE dark matter search program is described, to include the recent development of a ``heavy'' detector for application in spin-independent searches.
Since the decommission of the underground launching control room of the ground-based component of the French nuclear missile system, the whole installation has been turned into a cross-disciplinary underground laboratory. The LSBB is a unique low-noise underground laboratory because of its initial military conception and its location in the...
Each ground movement on Earth shakes the air column above it. When the acoustic wave reaches the ionosphere floor, charges are temporarily displaced, parallel to the acoustic excitation. An electric current is created giving birth to a magnetic signal. The density difference between ground and air makes the coupling very poor but this is...
International audience
The permanent operation of a 3 axes magnetometer in the LSBB below 550 m of calcite rock is a unique system of magnetic observation: a rejection rate better than 3 fT/Hz over 40 Hz. The observation of magneto-ionosphere responses to wave emissions both at the epicentre and at their arrival at LSBB for earthquakes of magnitude larger than 3 is...
The permanent operation of a 3 axes magnetometer in the LSBB below 550 m of calcite rock is a unique system of magnetic observation: a rejection rate better than 3 fT/Hz over 40 Hz. The observation of magneto-ionosphere responses to wave emissions both at the epicentre and at their arrival at LSBB for earthquakes of magnitude larger than 3 is...
The application of superheated droplet detectors (SDDs) to dark matter searches has so far been confined to the light nuclei refrigerants C2CIF5 and C4F10 (SIMPLE and PICASSO, respectively), with a principle sensitivity to spin-dependent interactions. Given the competitive results of these devices, as a result of their intrinsic insensitivity...
International audience
In the millihertz range, a single magnetometer can detect magnetic waves in the near-field regime. For such long wavelengths, it can measure the world-wide magnetic-background noise due to any charge displacement on Earth and within its environment. In this frequency band, the normal modes of the Earth's free oscillations exist and when...
International audience
International audience
The physical meaning of the azimuth information provided by the ultra low-noise magnetometer instrument [SQUID]2 is analyzed for mesopause and atmosphere electromagnetic signal sources. Consequences for a potential world-wide network of such instruments are evaluated.
International audience