[논문]Helicon wave heating and current drive in toroidal plasmas

Li, Jingchun; Ding, X T; Dong, J Q; Liu, S F

doi:10.1088/1361-6587/aba367

Helicon wave heating and current drive in toroidal plasmas

Plasma physics and controlled fusion, v.62 no.9, 2020년, pp.095013 -

Li, Jingchun (Nankai University, Tianjin 421001, People’s Republic of China) , Ding, X T (Southwestern Institute of Physics, P O Box 432, Chengdu 610041, People’s Republic of China) , Dong, J Q (Southwestern Institute of Physics, P O Box 432, Chengdu 610041, People’s Republic of China) , Liu, S F (Nankai University, Tianjin 421001, People’s Republic of China)

Abstract ▼ AI-Helper

Investigation of helicon wave heating and current drive (CD) in toroidal plasma has been carried out with the ray-tracing code GENRAY. The wave trajectories, profiles of power deposition and driven-currents are presented. It is shown that increasing the poloidal launch angle does not change the absorption rate of the wave, but moves the peak of the wave deposition toward the plasma core. Wave frequencies in the range of our interest (460 MHz ∼ 480 MHz) do not change the absorption of the wave. Under low parameter plasmas, we find that both the peak position and magnitude of the wave power deposition are dependent on the launched parallel refractive index n ||. With increasing the refractive index, the driving efficiency first increases and then decreases. The parallel refractive index figure of merit for mid-plane launching in HL-2M configuration is 3.2. With high plasma parameters, both the position and magnitude of the driving current are weakly dependent on n ||. The magnitude of the driven current is determined by both the absorption rate and the value of ξ e, which is related to n ||. It is also demonstrated that driven current increases with increase of the core plasma temperature and decrease of the core plasma density. The plasma ohmic current seems do not significantly affect the helicon CD efficiency, but moves the driven current toward the plasma core region and narrows the width of the driven current profile. In addition, the preliminary calculations including scrape-off-layer (SOL) suggest that the power absorption rate loss in SOL is about 5%–20%. These results provide a reference and theoretical basis for the design and construction of HL-2M helicon wave system.

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Helicon wave heating and current drive in toroidal plasmas

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