Analysis techniques for diagnosing runaway ion distributions in the reversed field pinch

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4960422· OSTI ID:22596490

Anderson, J. K.; Capecchi, W.; Bonofiglo, P. J.; Sears, S. H. ^[1]

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1. University of Wisconsin—Madison, Madison, Wisconsin 53706 (United States)

An advanced neutral particle analyzer (ANPA) on the Madison Symmetric Torus measures deuterium ions of energy ranges 8-45 keV with an energy resolution of 2-4 keV and time resolution of 10 μs. Three different experimental configurations measure distinct portions of the naturally occurring fast ion distributions: fast ions moving parallel, anti-parallel, or perpendicular to the plasma current. On a radial-facing port, fast ions moving perpendicular to the current have the necessary pitch to be measured by the ANPA. With the diagnostic positioned on a tangent line through the plasma core, a chord integration over fast ion density, background neutral density, and local appropriate pitch defines the measured sample. The plasma current can be reversed to measure anti-parallel fast ions in the same configuration. Comparisons of energy distributions for the three configurations show an anisotropic fast ion distribution favoring high pitch ions.

• OSTI ID: 22596490
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); 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
COMPARATIVE EVALUATIONS
CONFIGURATION
DENSITY
DEUTERIUM
DEUTERIUM IONS
DIAGNOSIS
DISTRIBUTION
ELECTRIC CURRENTS
ENERGY RESOLUTION
ENERGY SPECTRA
ION DENSITY
KEV RANGE 01-10
NEUTRAL PARTICLE ANALYZERS
NEUTRAL PARTICLES
PITCHES
PLASMA
REVERSED-FIELD PINCH DEVICES
REVERSE-FIELD PINCH
SYMMETRY
TIME RESOLUTION