Abstract
Plasma production experiments in helium at Uragan-2M have been performed to investigate the role of the hydrogen minority in helium. The experiments presented here were carried on with a controlled minority hydrogen concentration. The hydrogen minority allowed one to increase plasma density more than three times as compared with pure helium. The obtained plasma density is highest for whole time of Uragan-2M operation. The developed scenario allowed to decrease the neutral gas pressure at which the plasma production is possible. This is a requirement for achieving regimes of plasma production with full ionization. Although the initial gas mixture 14%H2 + 86%He can be treated as optimum, there is no sensitive dependence on hydrogen minority concentration, which makes the scenario robust. This study, together with initial LHD experiments, confirm the prospects of target plasma production by ICRF waves for stellarator type machines.
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The datasets generated during and analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
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This work also received funding from National Academy of Sciences of Ukraine (Grants П-3-22, and A-5-20).
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Moiseenko, V.E., Kovtun, Y.V., Lozin, A.V. et al. Plasma Production in ICRF in the Uragan-2M Stellarator in Hydrogen–Helium Gas Mixture. J Fusion Energ 41, 15 (2022). https://doi.org/10.1007/s10894-022-00326-8
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DOI: https://doi.org/10.1007/s10894-022-00326-8