Absolute Calibration of an Electrostatic Dust Detector
Authors: B. Rais, C.H. Skinner, 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 grid of interlocking circuit traces biased to 50 V, has been developed for the detection of dust on remote surfaces in air and vacuum environments. We report detailed measurements of the absolute calibration of the electrostatic dust detector. The sensitivity in vacuum for carbon particles with a count median diameter of 2.14 μm was found to be 0.15 ng/cm2/count for a 51 mm detector with cover mesh in vacuum conditions, and for lithium particles of average diameter 44 μm is 14.5 ng/cm2/count for a 13 mm detector without cover mesh in vacuum.
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Submitted to: PPPL Reports
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Download PPPL-4537 (pdf 480 KB 27 pp)
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