Ion cyclotron range of frequency heating with hydrogen and helium minority species in Heliotron E

In ion cyclotron range of frequency heating of Heliotron E, hydrogen and helium 3 were used as minority species. From the charge exchange neutral particle energy measurement, the bulk deuteron temperature was higher in the helium minority case by 20%–40% in the high power region. Helium minority has an advantage in this experiment because its loss region in the velocity space is small, the ion-ion collision cross-section is large and its charge exchange loss ratio is less than that of hydrogen. In this paper, we discuss the comparison of the heating efficiencies and the power loss by escaping particles between the experimental data and the calculation by the Monte Carlo code. The results of the calculation showed that approximately 40% higher efficiency was obtained in the helium minority case. This results agreed with the experimental data in the higher power region.