CONTROL OF ALPHA-PARTICLE TRANSPORT BY ION-CYCLOTRON RESONANCE HEATING

Control of radial alpha-particle transport by using ion cyclotron range of frequency (ICRF) waves is investigated in a large-aspect-ratio tokamak geometry. Spatially inhomogeneous ICRF wave energy with properly selected frequencies and wave numbers can induce fast convective transports of alpha particles at the speed of order valpha Approximately (PRF/nαε0)ρp, where PRF is the ICRF wave power density, nα is the alpha-particle density, ε0 is the alpha-particle birth energy, and ρp is the poloidal gyroradius of alpha particles at the birth energy. Application to International Thermonuclear Experimental Reactor (ITER) plasma is studied and possible antenna designs to control alpha-particle flux are discussed.