Author/Authors :
Vrancken، نويسنده , , M. and Argouarch، نويسنده , , A. and Blackman، نويسنده , , T. and Dumortier، نويسنده , , P. and Durodie، نويسنده , , F. and Evrard، نويسنده , , Roy M. and Goulding، نويسنده , , R.H. and Graham، نويسنده , , M. and Huygen، نويسنده , , S. and Jacquet، نويسنده , , Ph. and Kaye، نويسنده , , A. and Lerche، نويسنده , , E.A. and Nightingale، نويسنده , , M.P.S. and Van Eester، نويسنده , , D. and Vervier، نويسنده , , M.، نويسنده ,
Abstract :
Operating ion cyclotron resonance heating (ICRH) antennas at high power density puts them at risk of arcing which reduces the coupled power to the plasma because the perturbed impedance match triggers the voltage standing wave ratio (VSWR) based generator trip system but even worse might damage the antenna beyond repair because of the arcʹs localised energy deposition. New antennas are designed to operate in a load tolerant way which creates low impedance zones that are especially at risk since the existing VSWR protection systems are less sensitive to arcs in these areas. To protect these low impedance areas, a new arc protection system referred as scattering matrix arc detection (SMAD) has been proposed. This paper describes the basic operating principle and implementation in hard- and software for the JET ITER-like antenna (ILA), with testbed and preliminary JET commissioning results.
Keywords :
Antenna , Plasma heating , Impedance match , Voltage standoff , Arc protection , ICRH
