Magnetic Analysis for Current Straps of EAST ICRF Antenna

In order to achieve the ultimate physical goal of the more than 1 000 s steady-state advanced mode on the Experimental Advanced Superconducting Tokamak (EAST), a resonant double loop (RDL) of iron cyclotron range of frequency (ICRF) antenna, which consists of two current straps, was selected to heat. The current straps, which transmit energy power to plasma by coupling in the near-field region, are the key components of ICRF antenna. This paper covers the electromagnetic calculation for the current straps of ICRF antenna by the finite element method under the operating conditions of the disruption and the vertical displacement of plasma respectively. The results show the distributions of induced currents density and magnetic induction, as well as electromagnetic force on the current straps. Structural analysis was performed with the result of the electromagnetic force imposing on the current strap. The results provide theoretical basis for verifying the structure feasibility of current straps, and the analysis method has a certain reference value for future high-power ICRF antenna current straps relating with the electromagnetic analysis.