Fast-ion D-alpha diagnostic for NSTX

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2221902· OSTI ID:20861318

Heidbrink, W W; Bell, R E; Luo, Y; Solomon, W ^[1]

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1. University of California, Irvine, Irvine, California 92697 (United States)

A fast-ion D-alpha (FIDA) diagnostic is under development for the National Spherical Torus Experiment (NSTX). The FIDA technique is a charge-exchange recombination spectroscopy measurement that exploits the large Doppler shift of Balmer-alpha light from energetic hydrogenic atoms to infer the fast-ion density. The principal objective of the NSTX installation is to measure the transport of beam ions caused by fast-ion driven instabilities; detection of perpendicular acceleration of fast ions during high harmonic fast wave heating is another important goal. Recent data from a DIII-D FIDA diagnostic guide the design. The planned NSTX diagnostic consists of two separate instruments focusing on different aspects of the measurement. One instrument uses a transmission grating spectrometer to measure the perpendicular energy spectrum and the spatial profile every 10 ms; the anticipated resolution is {approx}10 keV in energy and {approx}5 cm in radius. A second instrument employs bandpass filters to detect fast-ion redistribution events with millisecond temporal resolution.

• OSTI ID: 20861318
• Journal Information: Review of Scientific Instruments, Vol. 77, Issue 10; Other Information: DOI: 10.1063/1.2221902; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGE EXCHANGE
DOPPLER EFFECT
DOUBLET-3 DEVICE
ENERGY SPECTRA
FILTERS
ION DENSITY
IONS
NSTX DEVICE
PLASMA
PLASMA BEAM INJECTION
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA HEATING
PLASMA INSTABILITY
SPECTROMETERS
SPHERICAL CONFIGURATION
TIME RESOLUTION