Numerical simulation of helicon waves current drive in the HL-2M tokamak for the steady-state scenario
Numerical simulation of helicon waves current drive in the HL-2M tokamak for the steady-state scenario
Liu Hong Bo(University of South China); Li Xin Xia(University of South China); Xiao Zheng Yao(University of South China); Zhang Ding Zong(Hengyang Normal University); Sun Ai Ping(Southwestern Institute of Physics)
79권 12호, 1135~1140쪽
초록
The helicon wave heating and current drive in the HL-2M tokamak for the steady-state scenario is studied numerically. Based on the theory of fast wave current drive proposed by Chiu, we analyze the characteristics of helicon waves damping for the HL-2M tokamak. For wave frequencies larger than 420 MHz, strong wave damping occurs, and electron Landau damping is dominant. Moreover, a strong wave absorption region associated with the dimensionless parameters βe and ξe that depend on the wave frequency is obtained. The helicon wave propagation and current drive are simulated using the GENRAY/CQL3D code. The results show that an off-axis current drive with profiles peak at ρ ∼ 0.4 can be generally received at a wave frequency f ∼ 500 MHz and the launched parallel refractive index n∕∕ = 3.8 and that the current drive efficiency reaches up to ∼140 kA/MW. A scan of n∕∕ showed that both the current drive profile peak and the generated current could be adjusted by changing the launched n∕∕ . Finally, a feasible scheme for the helicon wave off-axis current drive in the HL-2M tokamak is proposed.
Abstract
The helicon wave heating and current drive in the HL-2M tokamak for the steady-state scenario is studied numerically. Based on the theory of fast wave current drive proposed by Chiu, we analyze the characteristics of helicon waves damping for the HL-2M tokamak. For wave frequencies larger than 420 MHz, strong wave damping occurs, and electron Landau damping is dominant. Moreover, a strong wave absorption region associated with the dimensionless parameters βe and ξe that depend on the wave frequency is obtained. The helicon wave propagation and current drive are simulated using the GENRAY/CQL3D code. The results show that an off-axis current drive with profiles peak at ρ ∼ 0.4 can be generally received at a wave frequency f ∼ 500 MHz and the launched parallel refractive index n∕∕ = 3.8 and that the current drive efficiency reaches up to ∼140 kA/MW. A scan of n∕∕ showed that both the current drive profile peak and the generated current could be adjusted by changing the launched n∕∕ . Finally, a feasible scheme for the helicon wave off-axis current drive in the HL-2M tokamak is proposed.
- 발행기관:
- 한국물리학회
- 분류:
- 물리학