Studies of fast ion outflow to the helical divertor of the U-3M torsatron

Abstract

In the l = 3 Uragan-3M torsatron with RF-produced and heated plasmas (ω ω ci ), a two-temperature ion distribution with a suprathermal tail is formed. Faster ions (FIs) can be the characteristic of reactor-size stellarators in the long mean free path regime. The presence of the helical divertor offers new opportunities for studying FI loss by measuring ion fluxes and energies in the divertor plasma.Ion energy distributions were measured in divertor flows in two symmetric poloidal cross-sections in several field periods. It is shown that FI flows out to the divertor mainly on the ion B × ∇B drift side in accordance with the assumptions of a determinative FI contribution to the plasma divertor flow vertical asymmetry inherent to torsatrons/heliotrons.Strong toroidal non-uniformities in flows and energies of ions outflowing into the divertor are observed. The island structure of the U-3M magnetic configuration and locality of RF power injection are considered as possible reasons for these non-uniformities.

Behavior of RF Discharge Plasmas in the Uragan‐3M and Uragan‐2M Torsatrons

“…3). The FI outflow to the divertor predominantly on the ion B×∇B drift side due to ion trapping into toroidal and helical non-uniformities of the magnetic field [4,5]. The effect is confirmed by an appreciable difference in the time behavior of parallel and perpendicular fluxes of energetic CX neutrals after RF pulse termination (Fig.…”