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Title: Edge localized mode characteristics during edge localized mode mitigation by supersonic molecular beam injection in Korea Superconducting Tokamak Advanced Research

It has been reported that supersonic molecular beam injection (SMBI) is an effective means of edge localized mode (ELM) mitigation. This paper newly reports the changes in the ELM, plasma profiles, and fluctuation characteristics during ELM mitigation by SMBI in Korea Superconducting Tokamak Advanced Research. During the mitigated ELM phase, the ELM frequency increased by a factor of 2–3 and the ELM size, which was estimated from the D{sub α} amplitude, the fractional changes in the plasma-stored energy and the line-averaged electron density, and divertor heat flux during an ELM burst, decreased by a factor of 0.34–0.43. Reductions in the electron and ion temperatures rather than in the electron density were observed during the mitigated ELM phase. In the natural ELM phase, frequency chirping of the plasma fluctuations was observed before the ELM bursts; however, the ELM bursts occurred without changes in the plasma fluctuation frequency in the mitigated ELM phase.
Authors:
; ; ; ;  [1] ;  [2] ; ; ; ; ; ; ; ; ; ; ;  [3] ;  [4]
  1. Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), 34141 Daejeon (Korea, Republic of)
  2. (Korea, Republic of)
  3. National Fusion Research Institute, 34133 Daejeon (Korea, Republic of)
  4. Deparment of Nuclear and Quantum Engineering, KAIST, 34141 Daejeon (Korea, Republic of)
Publication Date:
OSTI Identifier:
22489933
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 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; AMPLITUDES; BEAM INJECTION; DIVERTORS; EDGE LOCALIZED MODES; ELECTRON DENSITY; ELECTRON TEMPERATURE; FLUCTUATIONS; HEAT FLUX; ION TEMPERATURE; MITIGATION; MOLECULAR BEAMS; PLASMA RADIAL PROFILES; REPUBLIC OF KOREA; STORED ENERGY; TOKAMAK DEVICES