Design characteristics of the ion cyclotron system for the KSTAR Tokamak

The design of the KSTAR (Korea Superconducting Tokamak Advanced Research) tokamak (R0 = 1.8 m, a= 0.5 m, κ = 2, δ = 1.8 BT = 3.5 T, Ip 2 MA, τpulse = 300 s) is being undertaken to do long-pulse. high β, advanced tokamak operating-mode fusion physics experiments. The ion cyclotron (IC) system will deliver 6 MW of rf power to the plasma in the 25 - 60 MHz frequency range, using a single four-strap antenna mounted in a midplane port. It will be used for ion heating, fast-wave current drive (FWCD), and mode conversion current drive (MCCD). The phasing between current straps in the antenna will be adjustable quickly during operation to provide the capability of changing the current-drive efficiency. The IC system will be capable of 300 s operation with 12 MW (upgrade) of rf power to the plasma. (author)