Test of KSTAR ICRF components for long-pulse operation

摘要

The high power ICRF components have been developed for long pulse operation of KSTAR tokamak, A water-cooled, high power density (/spl sim/ 10 MW/m/sup 2/) ICRF antenna, a water-cooled co-axial transmission line with the special connector for water sealing while maintaining electrical contact, a vacuum feedthrough for transmission of 1 MW RF power which has two alumina (Al/sub 2/O/sub 3/, 97%) ceramic cylinders and O-ring seal, and a phase shifter using liquid instead of gas for insulating dielectric medium have been developed. RF tests for these components show that stable operation is possible with the peak voltage over 30 kV for long pulse up to 300 seconds.