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Title: Modeling of the influences of electron cyclotron current drive on neoclassical tearing modes

Influences of external current drive on neoclassical tearing modes are studied numerically with a set of compressible magnetohydrodynamics equations. By considering the effects of driven current parameters and its deposition timing, and by examining the relationship between driven current and the missing bootstrap current, the basic requirements of deposition width and external current density for effectively suppressing neoclassical tearing modes are investigated. When the driven current density is able to compensate the missing bootstrap current and the deposition region is comparable with the saturated island, the suppression results are notable. Meanwhile, the pre-emptive strategy of current deposition reported experimentally is also evaluated, and the results agree with the experimental ones that early current deposition can enhance suppression effectiveness greatly. In addition, the deficiencies of continuous driven current are discussed when the plasma rotation has been taken into account, and the application of modulated current drive, which is synchronized in phase with the rotating island, can restore the stabilizing role under some conditions. The favorable parameters of modulation such as duty cycle are also addressed.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)
  2. Basic Science Section, North China Institute of Aerospace Engineering, Langfang 065000 (China)
  3. Department of Physics, Dalian Maritime University, Dalian 116026 (China)
Publication Date:
OSTI Identifier:
22410300
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; 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; BOOTSTRAP CURRENT; CURRENT DENSITY; DEPOSITION; ECR CURRENT DRIVE; MAGNETOHYDRODYNAMICS; MODULATION; PLASMA; PLASMA SIMULATION; ROTATING PLASMA; TEARING INSTABILITY