The ion cyclotron range of frequency (ICRF) heating system of the Korea Superconducting Tokamak
Advanced Research (KSTAR) tokamak couples 6MWof RF power to the plasma with a 4-strap
antenna. The antenna has been designed to operate for a pulse length ...
The ion cyclotron range of frequency (ICRF) heating system of the Korea Superconducting Tokamak
Advanced Research (KSTAR) tokamak couples 6MWof RF power to the plasma with a 4-strap
antenna. The antenna has been designed to operate for a pulse length up to 300 sec. A prototype
ICRF antenna was fabricated, and with no water-cooling, an RF test was performed to study
the stando capability of the antenna. In that test, half of a current strap was connected to the
matching circuit via a vacuum feedthrough and a directional coupler, and the other seven ports
were shorted at the input ports. Test results showed stando voltages and pulse lengths of 33.2 kV
for 60 sec and 25.2 kV for 300 sec. The ICRF heating system, including a resonant loop with a
matching circuit, was built at the RF test stand in KAERI. Resonant and matching characteristics
for various frequencies were investigated.