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

Journal Article · Sat Nov 15 04:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4891601· OSTI ID:22308941

Burrell, K. H.; Lao, L. L.; Pace, D. C. ^[1]; Grierson, B. A. ^[2]

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1. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
2. Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)

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.

• OSTI ID: 22308941
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 85; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

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