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

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4885496· OSTI ID:22308784

Mezonlin, E. D. ^[1]; Anderson, J. K.; Reusch, J. A. ^[2]

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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)

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.

• OSTI ID: 22308784
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

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