Commissioning the ICRF system and an ICRF assisted discharge cleaning at the KSTAR

Development of KSTAR in-vessel components and heating systems

“…ICRF power was successfully injected to KSTAR plasma with Fast Wave Electron Heating mode and showed the increase of plasma density and electron temperature. In addition, ICRF contributed to the KSTAR plasma by way of Ion Cyclotron Wall Cleaning (ICWC) [6]. Because of the large gap distance between the circular plasma and the D-shape antenna surface in the last two campaigns, the RF injection power had been limited to less than 300 kW due to the poor antenna coupling with the plasma.…”

Development of high power long-pulse RF transmitter for ICRF heating in fusion researches and cyclotron accelerator

“…The nominal toroidal magnetic field of KSTAR was 3 T and KSTAR require the 25-60 MHz RF source [3]. It need four set of 2 MW transmitter for ICRF heating and the first developed unit of the 2 MW transmitters achieved 1.9 MW after several years commissioning period and it has been used for KSTAR Divided by 100 on "Efficiency" Power-direc injected to the KSTAR plasma in 2009.…”