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Effect of LHCD (low hybrid current drive) on tearing mode instability

Technical Report:

Abstract

Effect of LHCD (low hybrid current drive) on tearing mode instability is investigated through both kinetic and MHD approaches. In linear kinetic theory, the response of the fast electrons driven by LHCD to the tearing mode perturbations results in reductions of both the growth rate and the width of the perturbative layer of tearing mode in collisional as well as semi-collisional regimes. From MHD theory and LHCD simulation in tokamak geometry, it is shown that LHCD leads to both modification of the current profile and outward shift of the rational surfaces and hence to variation of {delta}`of the tearing mode. Mostly LHCD plays a stabilizing role against tearing modes. However under some conditions considered, LHCD can stabilize tearing modes in higher-q{sub a} plasma while destabilize it in lower-q{sub a} case, which is in a qualitative agreement with some experimental observation.
Authors:
Zhengming, Sheng; Nong, Xiang; Guoyang, Yu [1] 
  1. Inst. of Plasma Phys., Academia Sinica, Hefei (China)
Publication Date:
Jan 01, 1992
Product Type:
Technical Report
Report Number:
CNIC-00576; ASIPP-0029.
Reference Number:
SCA: 700340; PA: AIX-24:009310; SN: 93000933703
Resource Relation:
Other Information: PBD: Jan 1992
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TEARING INSTABILITY; LOWER HYBRID CURRENT DRIVE; KINETICS; MAGNETOHYDRODYNAMICS; OSCILLATION MODES; PLASMA; TOKAMAK DEVICES; 700340; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES
OSTI ID:
10119879
Research Organizations:
China Nuclear Information Centre, Beijing, BJ (China)
Country of Origin:
China
Language:
English
Other Identifying Numbers:
Other: ON: DE93613700; ISBN 7-5022-0626-4; TRN: CN9201780009310
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[5] p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Zhengming, Sheng, Nong, Xiang, and Guoyang, Yu. Effect of LHCD (low hybrid current drive) on tearing mode instability. China: N. p., 1992. Web.
Zhengming, Sheng, Nong, Xiang, & Guoyang, Yu. Effect of LHCD (low hybrid current drive) on tearing mode instability. China.
Zhengming, Sheng, Nong, Xiang, and Guoyang, Yu. 1992. "Effect of LHCD (low hybrid current drive) on tearing mode instability." China.
@misc{etde_10119879,
title = {Effect of LHCD (low hybrid current drive) on tearing mode instability}
author = {Zhengming, Sheng, Nong, Xiang, and Guoyang, Yu}
abstractNote = {Effect of LHCD (low hybrid current drive) on tearing mode instability is investigated through both kinetic and MHD approaches. In linear kinetic theory, the response of the fast electrons driven by LHCD to the tearing mode perturbations results in reductions of both the growth rate and the width of the perturbative layer of tearing mode in collisional as well as semi-collisional regimes. From MHD theory and LHCD simulation in tokamak geometry, it is shown that LHCD leads to both modification of the current profile and outward shift of the rational surfaces and hence to variation of {delta}`of the tearing mode. Mostly LHCD plays a stabilizing role against tearing modes. However under some conditions considered, LHCD can stabilize tearing modes in higher-q{sub a} plasma while destabilize it in lower-q{sub a} case, which is in a qualitative agreement with some experimental observation.}
place = {China}
year = {1992}
month = {Jan}
}