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Title: Progress of neutral-beam-aided diagnostics on the HL-2A tokamak

A 32/64-channel Charge eXchange Recombination Spectroscopy (CXRS) and a 7-channel motional Stark effect (MSE) polarimeter have been developed on the HL-2A tokamak. To extract the maximum time resolution of the system, the incidence fibers of the spectrometer are pitch-controlled; and the double-slit fiber bundle can increase the spatial channels with one charge-coupled device detector. The ion temperature and plasma rotation with time and spatial resolutions up to 5 ms and 1 cm are obtained. Sawtooth oscillation, transition from intermediate phase (I phase) to high confinement mode (H mode) can be clearly observed by the CXRS. The spectrometer can be utilized as the main component of the MSE polarimeter, which can effectively overcome the weak Stark effect. The pitch angles of magnetic field are obtained for 7 spatial points covering 24 cm along major radius with time resolution of 40 ms.
Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Southwestern Institute of Physics, Chengdu 610041 (China)
Publication Date:
OSTI Identifier:
22308798
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; CHARGE EXCHANGE; CHARGE-COUPLED DEVICES; HL-2A TOKAMAK; H-MODE PLASMA CONFINEMENT; INCLINATION; ION TEMPERATURE; MAGNETIC FIELDS; PARTICLE BEAMS; PLASMA; POLARIMETERS; RECOMBINATION; ROTATION; SAWTOOTH OSCILLATIONS; SPATIAL RESOLUTION; SPECTROMETERS; SPECTROSCOPY; STARK EFFECT; TIME RESOLUTION