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Title: Modeling of high harmonic fast wave current drive on EAST tokamak

High harmonic fast waves (HHFW) are among the candidates for non-inductive current drive (CD), which is essential for long-pulse or steady-state operation of tokamaks. Current driven with HHFW in EAST tokamak plasmas is numerically studied. The HHFW CD efficiency is found to increase non-monotonically with the wave frequency, and this phenomenon is attributed to the multi-pass absorption of HHFW. The sensitivity of CD efficiency to the value of the parallel refraction index of the launched wave is confirmed. The quasilinear effects, assessed as significant in HHFW current drive with the GENRAY/CQL3D package, cause a significant increase in CD efficiency as RF power is increased, which is very different from helicon current drive. Simulations for a range of toroidal dc electric fields, in combination with a range of fast wave powers, are also presented and indicate that the presence of the DC field can also enhance the CD efficiency.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [2] ;  [4]
  1. School of Nuclear Science and Technology, University of South China, Hengyang, Hunan 421001 (China)
  2. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China)
  3. (China)
  4. School of Mathematics and Physics, University of South China, Hengyang, Hunan 421001 (China)
Publication Date:
OSTI Identifier:
22486435
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; 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; EFFICIENCY; ELECTRIC FIELDS; HT-7U TOKAMAK; NON-INDUCTIVE CURRENT DRIVE; NUMERICAL ANALYSIS; PLASMA; PULSES; REFRACTION; SENSITIVITY; SIMULATION; STEADY-STATE CONDITIONS; TOROIDAL CONFIGURATION; WAVE POWER