Electrostatic Dust Detector with Improved Sensitivity
Authors: D.P. Boyle, C.H. Skinner, and A. L. Roquemore
Abstract:
Methods to measure the inventory of dust particles and to remove dust if it approaches safety
limits will be required in next-step tokamaks such as ITER. An electrostatic dust detector, based
on a fine grid of interlocking circuit traces, biased to 30 or 50 V, has been developed for the
detection of dust on remote surfaces in air and vacuum environments. Gaining operational
experience of dust detection on surfaces in tokamaks is important, however the level of dust
generated in contemporary short-pulse tokamaks is comparatively low and high sensitivity is
necessary to measure dust on a shot-by-shot basis. We report on modifications in the detection
electronics that have increased the sensitivity of the electrostatic dust detector by a factor of up to
120, - a level suitable for measurements on contemporary tokamaks.
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Presented at: 18th Int. Conference on Plasma Surface Interactions in Controlled Fusion Devices, May 26-30, 2008 Toledo, Spain
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Download PPPL-4320 (pdf 215KB 13pp)
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