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First real-time detection of surface dust in a tokamaka)
a)Contributed paper, published as part of the Proceedings of the 18th Topical Conference on High-Temperature Plasma Diagnostics, Wildwood, New Jersey, May 2010.
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of dust detector (not to scale) showing interlocking combs of traces. Dust impinging on the traces causes a short circuit and a voltage signal is generated across the resistor.

Image of FIG. 2.
FIG. 2.

Dust detector before installation in NSTX.

Image of FIG. 3.
FIG. 3.

Poloidal cross section of NSTX vessel with close up of dust detector.

Image of FIG. 4.
FIG. 4.

Schematic of differential detection electronics. See text for explanation of components.

Image of FIG. 5.
FIG. 5.

Signal generated by laboratory dust source incident on detector as recorded by the NSTX data acquisition system.

Image of FIG. 6.
FIG. 6.

Response of 50.8 mm detector to carbon dust in vacuum, using a 50 V bias, differential counting electronics, and mesh cover. The line is a linear fit to the data

Image of FIG. 7.
FIG. 7.

(a) Dust signal; there is a total of 64 counts from dust. (b) The simultaneous null signal from the covered detector.

Image of FIG. 8.
FIG. 8.

(a) Time history of channel 1 (open detector) and channel 2 (covered detector) signals vs shot number over July and August 2009. The points where the Li aerosol was operated are distinguished in the legend. Note the two-order-of-magnitude increase in signal with the operation of the Bay C Li aerosol.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: First real-time detection of surface dust in a tokamaka)