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Title: First measurement of time evolution of electron temperature profiles with Nd:YAG Thomson scattering system on Heliotron J

A Nd:YAG Thomson scattering system has been developed for Heliotron J. The system consists of two 550 mJ 50 Hz lasers, large collection optics, and 25 radial channel (∼1 cm spatial resolution) interference polychromators. This measurement system achieves a S/N ratio of ∼50 for low-density plasma (n{sub e} ∼ 0.5 × 10{sup 19} m{sup −3}). A time evolution of electron temperature profiles was measured with this system for a high-intensity gas-puff (HIGP) fueling neutral-beam-injection plasma. The peripheral temperature of the higher-density phase after HIGP recovers to the low-density pre-HIGP level, suggesting that improving particle transport in the HIGP plasma may be possible.
Authors:
; ; ; ;  [1] ; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Graduate School of Energy Science, Kyoto University, Gokasho, Uji 611-0011 (Japan)
  2. Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011 (Japan)
Publication Date:
OSTI Identifier:
22308609
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:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAM INJECTION; ELECTRON TEMPERATURE; HELIOTRON; INTERFERENCE; NEODYMIUM LASERS; NEUTRAL-PARTICLE TRANSPORT; PLASMA DENSITY; SPATIAL RESOLUTION; THOMSON SCATTERING; TIME DEPENDENCE