First experiments on ICRF discharge generation by a W7-X-like antenna in the Uragan-2M stellarator
Abstract
In support of the ICRF experiments planned on the Wendelstein 7-X (W7-X) stellarator, i.e. fast ion generation, wall conditioning, target plasma production and heating, a first experimental study on plasma production has been made in the Uragan-2M (U-2M) stellarator using W7-X-like two-strap antenna. In all the experiments, antenna monopole phasing was used. The W7-X-like antenna operation with launched radiofrequency power of ~100 kW have been performed in helium (p = (4-14) × 10-2 Pa) with the vacuum vessel walls pre-loaded with hydrogen. Production of plasma with a density higher than 1012 cm-3 was observed near the first harmonic of the hydrogen cyclotron frequency. Operation at first hydrogen harmonic is feasible in W7-X future ICRF experiments.
- Publication:
-
Journal of Plasma Physics
- Pub Date:
- October 2020
- DOI:
- 10.1017/S0022377820001099
- Bibcode:
- 2020JPlPh..86e9017M
- Keywords:
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- fusion plasma;
- plasma heating;
- plasma devices