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Title: Effects of electron cyclotron current drive on the evolution of double tearing mode

Abstract

The effects of electron cyclotron current drive (ECCD) on the double tearing mode (DTM) in slab geometry are investigated by using two-dimensional compressible magnetohydrodynamics equations. It is found that, mainly, the double tearing mode is suppressed by the emergence of the secondary island, due to the deposition of driven current on the X-point of magnetic island at one rational surface, which forms a new non-complete symmetric magnetic topology structure (defined as a non-complete symmetric structure, NSS). The effects of driven current with different parameters (magnitude, initial time of deposition, duration time, and location of deposition) on the evolution of DTM are analyzed elaborately. The optimal magnitude or optimal deposition duration of driven current is the one which makes the duration of NSS the longest, which depends on the mutual effect between ECCD and the background plasma. Moreover, driven current introduced at the early Sweet-Parker phase has the best suppression effect; and the optimal moment also exists, depending on the duration of the NSS. Finally, the effects varied by the driven current disposition location are studied. It is verified that the favorable location of driven current is the X-point which is completely different from the result of single tearing mode.

Authors:
;  [1];  [2]
  1. Basic Science Section, North China Institute of Aerospace Engineering, Langfang 065000 (China)
  2. School of Computer and Remote Sensing Information Technology, North China Institute of Aerospace Engineering, Langfang 065000 (China)
Publication Date:
OSTI Identifier:
22490166
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEPOSITION; ECR CURRENT DRIVE; MAGNETIC ISLANDS; MAGNETOHYDRODYNAMICS; MODE RATIONAL SURFACES; PLASMA; SLABS; TEARING INSTABILITY; TOPOLOGY; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Sun, Guanglan, Dong, Chunying, and Duan, Longfang. Effects of electron cyclotron current drive on the evolution of double tearing mode. United States: N. p., 2015. Web. doi:10.1063/1.4930535.
Sun, Guanglan, Dong, Chunying, & Duan, Longfang. Effects of electron cyclotron current drive on the evolution of double tearing mode. United States. https://doi.org/10.1063/1.4930535
Sun, Guanglan, Dong, Chunying, and Duan, Longfang. 2015. "Effects of electron cyclotron current drive on the evolution of double tearing mode". United States. https://doi.org/10.1063/1.4930535.
@article{osti_22490166,
title = {Effects of electron cyclotron current drive on the evolution of double tearing mode},
author = {Sun, Guanglan and Dong, Chunying and Duan, Longfang},
abstractNote = {The effects of electron cyclotron current drive (ECCD) on the double tearing mode (DTM) in slab geometry are investigated by using two-dimensional compressible magnetohydrodynamics equations. It is found that, mainly, the double tearing mode is suppressed by the emergence of the secondary island, due to the deposition of driven current on the X-point of magnetic island at one rational surface, which forms a new non-complete symmetric magnetic topology structure (defined as a non-complete symmetric structure, NSS). The effects of driven current with different parameters (magnitude, initial time of deposition, duration time, and location of deposition) on the evolution of DTM are analyzed elaborately. The optimal magnitude or optimal deposition duration of driven current is the one which makes the duration of NSS the longest, which depends on the mutual effect between ECCD and the background plasma. Moreover, driven current introduced at the early Sweet-Parker phase has the best suppression effect; and the optimal moment also exists, depending on the duration of the NSS. Finally, the effects varied by the driven current disposition location are studied. It is verified that the favorable location of driven current is the X-point which is completely different from the result of single tearing mode.},
doi = {10.1063/1.4930535},
url = {https://www.osti.gov/biblio/22490166}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 9,
volume = 22,
place = {United States},
year = {Tue Sep 15 00:00:00 EDT 2015},
month = {Tue Sep 15 00:00:00 EDT 2015}
}