We show how the mechanical rigidity of a slightly detuned miniature Fabry–Pérot cavity can be modified with light. We use a microcavity in which one of the mirrors is a soft compliant microlever optimized to detect bolometric forces. The static compliance can either be decreased to zero or increased considerably depending on the detuning of the light with respect to the cavity resonance.
The cathode spots from vacuum arcs on 316 strainless steel are compared with the tracks found on the same material after exposure t o the plasma of the tokamak TFR 600. Further the erosion yields of Facuum arc cathodes of 316 stainless steel and titanium are determined from experiments and the measured values are compared with theoretical estimates. The velocity of the arc is investigated ae a function of the applied magnetic cross-field. The scatter of both, the velocity data nnd the erosion yields is substantial. Improved experiments are planned.
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