Journal
NUCLEAR FUSION
Volume 59, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/ab2ef8
Keywords
longitudinal energy flux; electrostatic potential; collisionless plasma expansion; trapped electrons; linear magnetic trap
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Funding
- Russian Foundation for Basic Research [17-02-00173, 18-32-00419]
- BASIS Foundation [18-1-5-12-1]
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We consider a flow of completely ionized magnetized plasma streaming along divergent magnetic field lines from an open magnetic trap. An analytical model is proposed that takes into account a transition from a collisional (fluid) regime to a collisionless kinetic regime as the flow expands. This allows for study of the formation of a plasma potential along the magnetic field and the acceleration of ions in a self-consistent way. We show that ion acceleration may influence the potential profile; in particular, it significantly reduces the potential gap inside the Debye sheath near the plasma collector. This positive effect predicts low arcing in plasma absorbing units, which is important for all large-scale fusion-aimed experiments in mirror machines. Applications of the theory to smaller table-top machines are also considered.
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