Modeling of high harmonic fast wave current drive on EAST tokamak

• DOI: 10.1063/1.4933355
• Publication Date: 2015-10-16T21:31:00Z
• Authors: J. C. Li; X. Y. Gong; J. Q. Dong; Q. D. Gao; N. Zhang; F. Y. Li
• Keywords: Helicon; Harmonic

High harmonic fast waves (HHFW) are among the candidates for non-inductive current drive (CD), which is essential long-pulse or steady-state operation of tokamaks. Current driven with HHFW in EAST tokamak plasmas numerically studied. The CD efficiency found to increase non-monotonically wave frequency, and this phenomenon attributed multi-pass absorption HHFW. sensitivity value parallel refraction index launched confirmed. quasilinear effects, assessed as significant GENRAY/CQL3D package, cause a RF power increased, very different from helicon drive. Simulations range toroidal dc electric fields, combination powers, also presented indicate that presence DC field can enhance efficiency.