Study of ICRF minority heating in a helical system

Abstract

The ICRF minority heating in a helical system is studied by a Monte Carlo simululation code. This code, which includes complicated orbits of high energetic particles, Coulomb collisions, and interactions between the particles and the applied RF wave, is used to investigate the heating efficiency, configuration dependency, finite beta effect, and radial electric field effect of the ICRF minority heating in a helical system by taking the Large Helical Device (LHD) as an example. Escaping energetic minority ions out of the plasma can contribute to enhancing the radial electric field. By solving the equation for time development of the radial electric field including particle fluxes for majority ions, electrons, and energetic minority ions, the radial electric field is consistently obtained.