Recent Progress with the KWISP Force Sensor
Abstract
The KWISP opto-mechanical force sensor has been built and calibrated in the INFN Trieste optics laboratory and is now under off-beam commissioning at CAST. It is designed to detect the pressure exerted by a flux of solar Chameleons on a thin (100 nm) Si3N4 micromembrane thanks to their direct coupling to matter. A thermally-limited force sensitivity of 1.5 · 10-14~N/Hz, corresponding to 7.5 · 10-16~m/Hz in terms of displacement, has been obtained. An originally developed prototype chameleon chopper has been used in combination with the KWISP force sensor to conduct preliminary searches for solar chamaleons.
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