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