Electrical details of the ICRH resonant double loop matching sections of ITER

Abstract

The use of short sections with very low characteristic impedance between the radiating part and the (matching) end-sections with sliding shorts of the International Thermonuclear Experimental Reactor (ITER) Resonant Double Loop (RDL) allows a design for this RDL which appears to be compatible with the expected mechanical loads during disruptions. In order to minimize the electric fields in these low impedance sections (which are at the high voltage parts of the RDL) a rounded rectangular cross-section can be used. It can further be dimensioned such as to modulate the parallel and perpendicular electric field components to common experience operating values: i.e. E⊥∼2×E∥ and E∥ less than 20 kV/cm. The paper reports expected electric fields and voltages in these low impedance sections. Corrections due to 3D-effects on the dimensions of all the sections as well as their influence on the current distribution in the sliding shorts in operating conditions when the shorts are nearest to such low impedance sectio...