Ponderomotive barriers in rotating mirror devices using static fields

Rubin, T.; Fisch, N. J.

doi:10.1063/5.0263066

Ponderomotive barriers in rotating mirror devices using static fields

Journal Article · Wed Jun 04 04:00:00 EDT 2025 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0263066· OSTI ID:2589291

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Princeton University, NJ (United States)

Particularly for aneutronic fusion schemes, it is advantageous to manipulate the fuel species differently from one another and to expel ash promptly. The ponderomotive effect can be used to selectively manipulate particles. It is commonly a result of particle–wave interactions and has a complex dependence on the particle charge and mass, enabling species selectivity. If the plasma is rotating, e.g., due to E x B motion, the ponderomotive effect can be generated using static (i.e., time-independent) perturbations to the electric and magnetic fields, which can be significantly cheaper to produce than time-dependent waves. We propose that this feature can be particularly useful in rotating mirror machines where mirror confinement can be enhanced by rotation, both through centrifugal confinement and additionally through a ponderomotive interaction with a static azimuthal perturbation. We identify specific static perturbations that generate a ponderomotive barrier and other perturbations that can generate either a repulsive barrier or an attractive ponderomotive well, which can be used to attract particles of a certain species while repelling another. We identify the regimes in which the ponderomotive potential can enhance net plasma confinement and the regime in which plasma confinement is not enhanced. The viability of each of these effects is found to be dependent on the specifics of the rotation profile and the resultant dispersion relation in the rotating plasma.

View Accepted Manuscript (DOE)

Research Organization:: Princeton University, NJ (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E); National Science Foundation (NSF)

Grant/Contract Number:: AR0001554

OSTI ID:: 2589291

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 32; ISSN 1070-664X; ISSN 1089-7674

Publisher:: AIP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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