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Title: Design of a retarding potential grid system for a neutral particle analyzer

The ion energy distribution in a magnetically confined plasma can be inferred from charge exchange neutral particles. On the Madison Symmetric Torus (MST), deuterium neutrals are measured by the Florida A and M University compact neutral particle analyzer (CNPA) and the advanced neutral particle analyzer (ANPA). The CNPA energy range covers the bulk deuterium ions to the beginning of the fast ion tail (0.34–5.2 keV) with high-energy resolution (25 channels) while the ANPA covers the vast majority of the fast ion tail distribution (∼10–45 keV) with low energy resolution (10 channels). Though the ANPA has provided insight into fast ion energization in MST plasma, more can be gained by increasing the energy resolution in that energy range. To utilize the energy resolution of the CNPA, fast ions can be retarded by an electric potential well, enabling their detection by the diagnostic. The ion energy distribution can be measured with arbitrary resolution by combining data from many similar MST discharges with different energy ranges on the CNPA, providing further insight into ion energization and fast ion dynamics on MST.
Authors:
;  [1] ; ;  [2]
  1. Department of Physics, Florida A and M University, Tallahassee, Florida 32310 (United States)
  2. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
Publication Date:
OSTI Identifier:
22308784
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CHARGE EXCHANGE; DEUTERIUM; DEUTERIUM IONS; ELECTRIC POTENTIAL; ENERGY RESOLUTION; ENERGY SPECTRA; GRIDS; ION DETECTION; KEV RANGE; NEUTRAL PARTICLE ANALYZERS; NEUTRAL PARTICLES; PLASMA; PLASMA CONFINEMENT; POTENTIALS; REVERSED-FIELD PINCH DEVICES