Neutral particle analyzer diagnostics on the TCV tokamak

Journal Article · Wed Mar 15 04:00:00 EST 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2185151· OSTI ID:20778917

Karpushov, Alexander N; Duval, Basil P; Schlatter, Christian; Afanasyev, Valery I; Chernyshev, Fedor V ^[1]

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1. Centre de Recherches en Physique des Plasmas, Association EURATOM-Confederation Suisse, Ecole Polytechnique Federale de Lausanne, CRPP-EPFL, CH-1015 Lausanne (Switzerland)

Experimental apparatus and data analysis techniques used in neutral particle analyzer (NPA) diagnostics on the Tokamak a 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.

• OSTI ID: 20778917
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 77; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related 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