Numerical studies of electron cyclotron wave current drive on HL-2A tokamak

Journal Article · Mon Jun 15 04:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4923303· OSTI ID:22490934

Li, J. C.; Dong, J. Q.; Song, S. D.; Gao, Q. D. ^[1]; Zheng, P. W. ^[2]; Du, D. ^[3]

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1. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China)
2. School of Environmental Protection and Safety Engineering, University of South China, Hengyang, Hunan 421001 (China)
3. School of Mathematics and Physics, University of South China, Hengyang, Hunan 421001 (China)

The electron cyclotron wave (ECW) current drive (CD) for the HL-2A tokamak is investigated numerically with a new ray-tracing and Fokker-Planck code. The code is benchmarked with other well-tested linear and quasilinear codes and is then used to study the electron cyclotron current drive on the HL-2A tokamak. The wave propagation, power deposition, and driven-current profiles are presented. The effect of electron trapping is also assessed. It is found that quasilinear effects are negligible at the present ECW power levels and that when both waves are injected at an angle of 20° on the plasma equatorial plane, the CD efficiency for the HL-2A saturates at ∼0.029 × 10{sup 20 }A/W/m{sup 2} and ∼0.020 × 10{sup 20 }A/W/m{sup 2} for the 0.5 MW/68 GHz first harmonic ordinary (O1) and 1 MW/140 GHz second harmonic extraordinary (X2) modes, respectively. The effects of the plasma density, temperature, and wave-launching position on the driven current are also investigated analytically and numerically.

• OSTI ID: 22490934
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 22; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BENCHMARKS
DEPOSITION
ECR CURRENT DRIVE
EFFICIENCY
ELECTRON TEMPERATURE
FOKKER-PLANCK EQUATION
GHZ RANGE
HL-2A TOKAMAK
ION TEMPERATURE
NUMERICAL ANALYSIS
PLASMA DENSITY
TRAPPED ELECTRONS
WAVE PROPAGATION