Neutral particle analyzer diagnostics on the TCV tokamak

Experimental apparatus and data analysis techniques used in neutral particle analyzer (NPA) diagnostics on the Tokamak à Configuration Variable (TCV) are described. Two NPAs are used on TCV to measure the energy spectrum of neutral particle fluxes from the plasma. The "five-channel energy analy...

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Bibliographic Details
Published in:Review of scientific instruments 2006-03, Vol.77 (3), p.033504-033504-13
Main Authors: Karpushov, Alexander N., Duval, Basil P., Schlatter, Christian, Afanasyev, Valery I., Chernyshev, Fedor V.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DATA ANALYSIS
DEUTERIUM
ELECTRON MULTIPLIER DETECTORS
ENERGY RESOLUTION
ENERGY SPECTRA
HELIUM
HYDROGEN
KEV RANGE
NEUTRAL PARTICLE ANALYZERS
PERMANENT MAGNETS
PLASMA
PLASMA DIAGNOSTICS
STRIPPING
TCV TOKAMAK
TIME RESOLUTION
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Summary:Experimental apparatus and data analysis techniques used in neutral particle analyzer (NPA) diagnostics on the Tokamak à Configuration Variable (TCV) are described. Two NPAs are used on TCV to measure the energy spectrum of neutral particle fluxes from the plasma. The "five-channel energy analyzer of atomic particles" used in double electrical analysis mode with fast voltage sweeping detect particles without atomic mass discrimination in the energy range of 0.6 - 8.0 keV with a time resolution of 0.5 - 2.0 ms and an energy resolution of 7%-20%. The 28-channel "compact neutral particle analyzer" (CNPA) is an EIIB spectrometer with mass and energy separations designed for medium sized fusion machines featuring a carbon neutral stripping foil, a permanent magnet for dispersion, and channel-electron multiplier detectors. The CNPA simultaneously detects two mass species [hydrogen (H) and deuterium (D) or D and helium (He)] in the 0.5 - 50 keV energy range with a resolution of 60%-10% and a time resolution of 0.5 - 4.0 ms . The CNPA views the plasma across the path of the diagnostic neutral beam and can perform active charge-exchange NPA measurement. Data analysis procedures and numerical algorithms developed for NPA measurement are routinely used on TCV to obtain information on the plasma ion temperature, ion energy distribution function, plasma isotope ratios, and other plasma characteristics.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2185151