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

Abstract

In the Uragan‐3M (U‐3M) and Uragan‐2M (U‐2M) torsatrons possibilities and prospects of Alfvén method utilization for wall conditioning, plasma production and heating are studied. In U‐3M the effect of fast ion loss on H‐like mode formation is investigated. In U‐2M the wall conditioning associated with the chemical reactivity of the atomic hydrogen to create volatile substances is used. A compact four‐strap antenna is proposed for Alfvén resonance heating in U‐2M (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Progress in stellarator research at IPP-Kharkov

“…10 at t = 73-75 ms. The SXR signal increase is evidently associated with the plasma density increase, which is always observed at the end of this type of the U-3M discharge [11]. An asymmetry of the SXR emission profi le is clearly shown in a normalised SXR profi le (see Fig.…”

“…The transition is observed in the low-density frame--antenna U-3M discharges [10,11]. Figure 9a shows SXR signals from channels with opposite impact parameters.…”

First experiments on ICRF discharge generation by a W7-X-like antenna in the Uragan-2M stellarator

“…The experiments on ICRF plasma build-up by the W7-X-like antenna were carried out in the U-2M stellarator-type device (see Pankratov et al 2010;Moiseenko et al 2011;Voitsenya et al 2014;Moiseenko et al , 2017a. U-2M (see figure 2) was assembled in the early 1990s (Bykov et al 1990;Pavlichenko 1993), operated briefly and then conserved.…”

“…The experiments on ICRF plasma build-up by the W7-X-like antenna were carried out in the U-2M stellarator-type device (see Pankratov et al. 2010; Moiseenko et al. 2011; Voitsenya et al.…”

“…The single and double frame, the crankshaft, the three-half-turn and the four-strap antennae (Pankratov et al. 2010; Moiseenko et al. 2011, 2016, 2017 a ) were used.…”