ICRF heating in volumetric neutron source JUST-T for transmutation of minor actinides

Plasma heating by waves in the cyclotron frequency range (ICRF) in parallel with neutral beams is proposed for the volumetric neutron source based on the JUST-T tokamak project. Calculations of the transverse refractive index ( ) were performed for slow waves (SW) and fast magnetosonic waves (FW) versus the plasma radius. The coefficients of SW and FW decay for ICRH at the harmonics of the ion-cyclotron frequency and for ions and electrons were calculated. The calculations were performed for three DT mixtures: (a) deuterium minority in tritium plasmas; (b) n D∼ n T; and (c) tritium minority in deuterium plasmas. The calculations were also performed for 3He minority in DT plasmas with comparable D and T concentrations. The effective formation of travelling fast waves in VNS JUST-T by phasing several loop antennas located some distance away in the toroidal direction to provide current drive is investigated.