D-T Fusion with Ion Cyclotron Resonance Heating in the JET Tokamak

Abstract

Ion cyclotron resonance heating (ICRH) experiments have been carried out in JET D-T plasmas using scenarios applicable to reactors. Deuterium minority heating in tritium plasmas is used for the first time and produces 1.66 MW of D-T fusion power for an ICRH power of 6 MW. The $Q$ value is 0.22, which is a record for steady state discharges. Fundamental $\mathrm{He}{}^3$ minority ICRH, in both 50:50 D-T and tritium dominated plasmas, generates strong bulk ion heating and ion temperatures up to 13 keV. Second harmonic tritium ICRH is seen to heat mainly the electrons as expected for JET conditions. All three schemes produce $H-\mathrm{mode}$ plasmas.