Parametric study of helicon wave current drive in NCST
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Helicon waves are fast magnetosonic waves that can efficiently drive off-axis plasma current in tokamak plasmas through electron Landau damping (ELD) and transit-time magnetic pumping (TTMP) effect. Simulation of helicon wave current drive (HCD) were conducted for the purpose of increasing the discharge current of the NCST. The influence of electron Landau damping on wave absorption is analyzed based on the dispersion relation. Furthermore, the impacts of wave and plasma parameters on current drive efficiency are studied systematically. The analysis reveals that the dominant mechanism of wave absorption in NCST is ELD when the wave frequency f > 40 MHz. At a frequency of approximately 65 MHz, current drive can generally be achieved to supplement the bootstrap current. In addition, the maximum current drive efficiency can reach 131 kA/MW when the optimal combination ,is adopted for the NCST scenario. The conclusions provide a reference and theoretical basis for the design and construction of the helicon wave system in NCST.
