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Title: A method for determining poloidal rotation from poloidal asymmetry in toroidal rotation (invited)

A new diagnostic has been developed on DIII-D that determines the impurity poloidal rotation from the poloidal asymmetry in the toroidal angular rotation velocity. This asymmetry is measured with recently added tangential charge exchange viewchords on the high-field side of the tokamak midplane. Measurements are made on co- and counter-current neutral beams, allowing the charge exchange cross section effect to be measured and eliminating the need for atomic physics calculations. The diagnostic implementation on DIII-D restricts the measurement range to the core (r/a < 0.6) where, relative to measurements made with the vertical charge exchange system, the spatial resolution is improved. Significant physics results have been obtained with this new diagnostic; for example, poloidal rotation measurements that significantly exceed neoclassical predictions.
Authors:
 [1] ; ; ;  [2] ;  [3]
  1. Department of Physics, University of California-San Diego, 9500 Gilman Dr., La Jolla, California 92093 (United States)
  2. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
  3. Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)
Publication Date:
OSTI Identifier:
22308941
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; ASYMMETRY; CHARGE EXCHANGE; COUNTER CURRENT; CROSS SECTIONS; DOUBLET-3 DEVICE; MEASURING METHODS; NEOCLASSICAL TRANSPORT THEORY; NEUTRAL PARTICLES; PARTICLE BEAMS; ROTATION; SPATIAL RESOLUTION