Enhanced Sensitivity Beam Emission Spectroscopy System for Nonlinear Turbulence Measurements

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dc.creatorGupta, Deepak K
dc.creatorFonck, Raymond J
dc.creatorMcKee, George R
dc.creatorSchlossberg, David J
dc.creatorShafer, Morgan W
dc.date2008-05-09
dc.date.accessioned2026-07-07T11:33:47Z
dc.date.available2026-07-07T11:33:47Z
dc.descriptionAn upgraded Beam Emission Spectroscopy (BES) system has been deployed to access low amplitude turbulence regions near internal transport barriers on the DIII-D tokamak. Sixteen high sensitivity channels are being installed. A significant increase in total signal to noise is achieved by: 1.) Increased spatial volume sampling tailored to known turbulence characteristics; 2.) An increased throughput spectrometer assembly to isolate the local beam fluorescence, coupled to new large-area photoconductive photodiodes; 3.) A new sharp edge interference filter designed to optimize detection of the beam emission plus a significant fraction of the thermal deuterium charge exchange. A new data acquisition system has been installed, providing an 8 times increase in integration time or an increased sample rate. Preliminary results from the upgraded system show a signal enhancement of greater than an order of magnitude. A clear broadband density fluctuation signal is observed in H-mode discharges with the upgraded BES system, demonstrating the significant performance enhancement.
dc.descriptionHTPD-2004
dc.identifierhttps://arxiv.org/abs/0805.1271
dc.identifierhttp://arxiv.org/abs/0805.1271
dc.identifierRev.Sci.Instrum.75:3493,2004
dc.identifierdoi:10.1063/1.1787951
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198015
dc.subjectPlasma Physics
dc.subjectInstrumentation and Detectors
dc.titleEnhanced Sensitivity Beam Emission Spectroscopy System for Nonlinear Turbulence Measurements
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