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Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experimenta)
a)Contributed paper, published as part of the Proceedings of the 19th Topical Conference on High-Temperature Plasma Diagnostics, Monterey, California, May 2012.
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View: Figures


Image of FIG. 1.
FIG. 1.

BES sightlines provide radial coverage from core to scrape-off-layer regions and four discrete poloidal arrays.

Image of FIG. 2.
FIG. 2.

BES auto-power spectrograms for measurements at (a) R = 129 cm and (b) 142 cm; (c) low frequency odd-n magnetic fluctuations; (d) thermal D α emission measurements; (e) neutron measurements; (f) BES time-series data with NBI power (green line); and (g) BES auto-power spectra at 534 ms with photodetector dark noise spectrum.

Image of FIG. 3.
FIG. 3.

(a) Coherence and (b) cross-phase spectra among four channels in the BES R = 140 cm poloidal array during an ELM-free, MHD quiescent period; (c) auto-power spectra and photon and dark noise for reference channel; (d) filtered data (8–50 kHz) used for calculations in (e) and (f); (e) time lag auto- and cross-correlation functions and envelopes; and (f) correlation envelope at zero time lag vs. channel separation. Black line in (c)–(e) denotes reference channel.

Image of FIG. 4.
FIG. 4.

(a) NSTX density and pitch angle profiles with BES measurements at R = 133, 140, and 143 cm; (b) BES sightlines crossing neutral beam sources, and short cross-lines show imaging planes; (c) sightline misalignment with magnetic field along sightlines; and (d) PSF image contours at 50% (solid) and 10% (dashed) of peak intensity with magnetic field puncture points (diamonds) on successive image planes.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Diagnostic performance of the beam emission spectroscopy system on the National Spherical Torus Experimenta)