Large Aperture Electrostatic Dust Detector
Authors: C.H. Skinner, R. Hensley, and A.L Roquemore
Abstract:
Diagnosis and management of dust inventories generated in next-step magnetic fusion devices is necessary for their safe operation. A novel electrostatic dust detector, based on a fine grid of interlocking circuit traces biased to 30 or 50 ν has been developed for the detection of dust particles on remote surfaces in air and vacuum environments. Impinging dust particles create a temporary short circuit and the resulting current pulse is recorded by counting electronics. Up to 90% of the particles are ejected from the grid or vaporized suggesting the device may be useful for controlling dust inventories. We report measurements of the sensitivity of a large area (5x5 cm) detector to microgram quantities of dust particles and review its applications to contemporary tokamaks and ITER.
__________________________________________________
Presented at: Thirty-Fourth EPS Conference on Plasma Physics, 2–6 July 2007, Warsaw, Poland.
__________________________________________________
Download PPPL-4266 (pdf 444 Kb)
__________________________________________________