Effect of α-particles on radial electric field structure in Torsatron/Heliotron reactor

The radial electric field structure in the fusion reactor having the Torsatron/Heliotron configuration is discussed, taking into account the effects of the orbit loss of α-particles. It was found that the direct loss of α-particles has only a small influence on the profile of the radial electric field. The trapping efficiency of the α-particles is also evaluated by using the self-consistent radial electric field. (author)