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Title: Rotational pumping revisited

Abstract

This paper considers a pure electron plasma, with a small admixture of negative ions, confined in a Penning–Malmberg trap. When a diocotron mode is excited on the plasma, the end sheaths of the plasma are azimuthally distorted. During reflection at a distorted end sheath, an ion steps off of the surface characterizing the drift motion in the plasma interior, and this step produces transport. The diocotron mode transfers canonical angular momentum to the ions, and in response damps. These transport mechanism and associated damping are called rotational pumping. It is particularly strong when the axial bounce motion and the rotational drift motion, in the rotating frame of the mode, satisfy a resonance condition. This paper calculates the transport flux of ions and the associated damping rate of the mode in the resonant regime. Previous papers have discussed the theory and the experimental observation of rotational pumping for the special case of a diocotron mode with azimuthal wave number l = 1, and this paper extends the theory to modes with l ≠ 1, which may sound like a trivial extension, but in fact is not.

Authors:
ORCiD logo [1]
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  1. University of California San Diego, La Jolla, CA (United States)
Publication Date:
Research Org.:
University of California San Diego, La Jolla, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1978957
Alternate Identifier(s):
OSTI ID: 1825212
Grant/Contract Number:  
SC0018236; PHY1805764
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 28; Journal Issue: 10; 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; electrostatics; Hamiltonian mechanics; coordinate system; plasma instabilities; plasma properties and parameters

Citation Formats

O'Neil, Thomas M. Rotational pumping revisited. United States: N. p., 2021. Web. doi:10.1063/5.0064401.
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O'Neil, Thomas M. Rotational pumping revisited. United States. https://doi.org/10.1063/5.0064401
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O'Neil, Thomas M. Fri . "Rotational pumping revisited". United States. https://doi.org/10.1063/5.0064401. https://www.osti.gov/servlets/purl/1978957.
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@article{osti_1978957,
title = {Rotational pumping revisited},
author = {O'Neil, Thomas M.},
abstractNote = {This paper considers a pure electron plasma, with a small admixture of negative ions, confined in a Penning–Malmberg trap. When a diocotron mode is excited on the plasma, the end sheaths of the plasma are azimuthally distorted. During reflection at a distorted end sheath, an ion steps off of the surface characterizing the drift motion in the plasma interior, and this step produces transport. The diocotron mode transfers canonical angular momentum to the ions, and in response damps. These transport mechanism and associated damping are called rotational pumping. It is particularly strong when the axial bounce motion and the rotational drift motion, in the rotating frame of the mode, satisfy a resonance condition. This paper calculates the transport flux of ions and the associated damping rate of the mode in the resonant regime. Previous papers have discussed the theory and the experimental observation of rotational pumping for the special case of a diocotron mode with azimuthal wave number l = 1, and this paper extends the theory to modes with l ≠ 1, which may sound like a trivial extension, but in fact is not.},
doi = {10.1063/5.0064401},
journal = {Physics of Plasmas},
number = 10,
volume = 28,
place = {United States},
year = {Fri Oct 08 00:00:00 EDT 2021},
month = {Fri Oct 08 00:00:00 EDT 2021}
}
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