Flux-driven algebraic damping of m = 2 diocotron mode
Abstract
Experiments with pure electron plasmas in a Malmberg–Penning trap have observed linear in time, algebraic damping of m = 2 diocotron modes. Transport due to small field asymmetries produces a low-density halo of electrons moving radially outward from the plasma core, and the mode damping begins when the halo reaches the resonant radius of the mode. The damping rate is proportional to the flux of halo particles through the resonant layer. The damping is related to, but distinct from spatial Landau damping in which a linear wave–particle resonance produces exponential damping. This paper reports an analytic theory that captures the main signatures reported for this novel damping, namely, that the damping begins when the halo particles reach the resonant radius and that the damping is algebraic in time with nearly constant damping rate. The model also predicts a nonlinear frequency shift. The model provides two ways to think about the damping. It results from a transfer of canonical angular momentum from the mode to halo particles being swept by the mode field through the nonlinear cat's eye orbits of the resonant region. More mechanistically, the electric field produced by the perturbed charge density of the resonant particles acts back onmore »
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1852546
- Grant/Contract Number:
- SC0018236; PHY-1805764
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 9; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; plasma waves; Hamiltonian mechanics; numerical algorithms; wave particle interactions; equilibrium thermodynamics; electrostatics; green-functions technique
Citation Formats
Chim, Chi Yung, and O'Neil, Thomas M. Flux-driven algebraic damping of m = 2 diocotron mode. United States: N. p., 2021.
Web. doi:10.1063/5.0060022.
Chim, Chi Yung, & O'Neil, Thomas M. Flux-driven algebraic damping of m = 2 diocotron mode. United States. https://doi.org/10.1063/5.0060022
Chim, Chi Yung, and O'Neil, Thomas M. Wed .
"Flux-driven algebraic damping of m = 2 diocotron mode". United States. https://doi.org/10.1063/5.0060022. https://www.osti.gov/servlets/purl/1852546.
@article{osti_1852546,
title = {Flux-driven algebraic damping of m = 2 diocotron mode},
author = {Chim, Chi Yung and O'Neil, Thomas M.},
abstractNote = {Experiments with pure electron plasmas in a Malmberg–Penning trap have observed linear in time, algebraic damping of m = 2 diocotron modes. Transport due to small field asymmetries produces a low-density halo of electrons moving radially outward from the plasma core, and the mode damping begins when the halo reaches the resonant radius of the mode. The damping rate is proportional to the flux of halo particles through the resonant layer. The damping is related to, but distinct from spatial Landau damping in which a linear wave–particle resonance produces exponential damping. This paper reports an analytic theory that captures the main signatures reported for this novel damping, namely, that the damping begins when the halo particles reach the resonant radius and that the damping is algebraic in time with nearly constant damping rate. The model also predicts a nonlinear frequency shift. The model provides two ways to think about the damping. It results from a transfer of canonical angular momentum from the mode to halo particles being swept by the mode field through the nonlinear cat's eye orbits of the resonant region. More mechanistically, the electric field produced by the perturbed charge density of the resonant particles acts back on the plasma core causing E × B drift that gives rise to the damping and nonlinear frequency shift.},
doi = {10.1063/5.0060022},
journal = {Physics of Plasmas},
number = 9,
volume = 28,
place = {United States},
year = {Wed Aug 18 00:00:00 EDT 2021},
month = {Wed Aug 18 00:00:00 EDT 2021}
}
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