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Title: Particle transport inferences from density sawteeth

Sawtooth oscillations in tokamaks are defined by their effect on electron temperature: a rapid flattening of the core profile followed by an outward heat pulse and a slow core recovery caused by central heating. Recent high-resolution, multi-chord interferometer measurements on JTEXT extend these studies to particle transport. Sawteeth only partially flatten the core density profile, but enhanced particle diffusion on the time scale of the thermal crash occurs over much of the profile, relevant for impurities. Recovery between crashes implies an inward pinch velocity extending to the center.
Authors:
; ;  [1] ; ;  [2]
  1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China)
  2. Institute for Fusion Studies, University of Texas, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
22300128
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 5; 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; DENSITY; DIFFUSION; ELECTRON TEMPERATURE; HEATING; PLASMA IMPURITIES; PULSES; SAWTOOTH OSCILLATIONS; TOKAMAK DEVICES