Conceptual design of helium recycling control system in a divertor of a tokamak reactor

A concept for the application of ICRF (ion cyclotron resonance frequency) fields in a divertor is proposed to control the back-flow of recycled He ions and to reduce the He build-up in the core plasmas. The three-dimensional motions of He ions are traced by particle simulations in a divertor system. The simulation results show the applicability of the ICRF control systems.