ICRF Plasma Production with the W7-X Like Antenna in the Uragan-2 M Stellarator

The results of the plasma start-up with ICRH of U-2 M RF discharges in H-2 +He mixture with newly implemented controlled gas H-2 concentration are presented. The W7-X like ICRH antenna operated in monopole phasing with applied RF power of similar to 100 kW. We investigated plasma start-up in the pressure range p = 6 x 10(-4) - 9 x 10(-2) Pa. Plasma production with an average density of up to N-e similar to 10(13) cm(-3) was observed at frequencies the fundamental harmonic of the hydrogen cyclotron frequency. (C) 2022 The Japan Society of Plasma Science and Nuclear Fusion Research

Automated summary

The results of plasma start-up with ICRH in RF discharges of U-2 M using a controlled gas H-2 concentration in an H-2 + He mixture are presented. The experimental setup included a W7-X-like ICRH antenna, and high-density plasma production was observed at relatively low pressures.