Progress in development of KSTAR heating and current drive systems for long pulse operation

The heating and current drive systems for the KSTAR tokamak are being developed to support long pulse, high beta, advanced tokamak fusion physics experiments. The heating and current drive systems consist of neutral beam injection (NBI) and radio frequency (RF) systems, and they have to be able to operate for long pulse lengths up to 300 sec. The flexibility to provide a range of control functions including current drive and profile control derives from the use of multiple heating technologies: tangential NBI (beam energy <120 keV, 8 MW), ion cyclotron waves (frequency range of 25-60 MHz, 6 MW), and lower hybrid waves (frequency of 5.0 GHz, 1.5 MW). Development of high power, long pulse relevant heating and current drive technologies for each system are underway. (author)