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Title: Mapping and uncertainty analysis of energy and pitch angle phase space in the DIII-D fast ion loss detector

New phase space mapping and uncertainty analysis of energetic ion loss data in the DIII-D tokamak provides experimental results that serve as valuable constraints in first-principles simulations of energetic ion transport. Beam ion losses are measured by the fast ion loss detector (FILD) diagnostic system consisting of two magnetic spectrometers placed independently along the outer wall. Monte Carlo simulations of mono-energetic and single-pitch ions reaching the FILDs are used to determine the expected uncertainty in the measurements. Modeling shows that the variation in gyrophase of 80 keV beam ions at the FILD aperture can produce an apparent measured energy signature spanning across 50-140 keV. These calculations compare favorably with experiments in which neutral beam prompt loss provides a well known energy and pitch distribution.
Authors:
; ;  [1] ;  [2]
  1. General Atomics, PO Box 85608, San Diego, California 92186-5608 (United States)
  2. Department of Physics, University of Hawaii, Hilo, Hawaii 96720-4091 (United States)
Publication Date:
OSTI Identifier:
22308927
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; COMPARATIVE EVALUATIONS; DOUBLET-3 DEVICE; INCLINATION; ION BEAMS; ION DETECTION; KEV RANGE; LIMITING VALUES; MAGNETIC SPECTROMETERS; MAPPING; MONTE CARLO METHOD; NEUTRAL PARTICLES; PARTICLE BEAMS; PARTICLE LOSSES; PHASE SPACE; TAIL IONS