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Title: Electron Plasmas Cooled by Cyclotron-Cavity Resonance

Abstract

We observe that high-Q electromagnetic cavity resonances increase the cyclotron cooling rate of pure electron plasmas held in a Penning-Malmberg trap when the electron cyclotron frequency, controlled by tuning the magnetic field, matches the frequency of standing wave modes in the cavity. For certain modes and trapping configurations, this can increase the cooling rate by factors of 10 or more. In this paper, we investigate the variation of the cooling rate and equilibrium plasma temperatures over a wide range of parameters, including the plasma density, plasma position, electron number, and magnetic field.

Authors:
 [1];  [2];  [3];  [4];  [3];  [4];  [3];  [5];  [6];  [3];  [3];  [6];  [3]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Beloit College, WI (United States). Dept. of Physics and Astronomy
  3. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  4. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy
  5. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemistry
  6. Purdue Univ., West Lafayette, IN (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States); Purdue Univ., West Lafayette, IN (United States); Univ. of British Columbia, Vancouver, BC (Canada)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC)
OSTI Identifier:
1438653
Alternate Identifier(s):
OSTI ID: 1329515
Report Number(s):
LLNL-JRNL-693077
Journal ID: ISSN 0031-9007; TRN: US1900476
Grant/Contract Number:  
AC52-07NA27344; FG02-06ER54904; SC0014446; 1500538-PHY; 1500470-PHY; SAPPJ-2014-0026
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; exotic atoms & molecules; nonneutral plasmas; single-component plasmas; Penning traps

Citation Formats

Povilus, A. P., DeTal, N. D., Evans, L. T., Evetts, N., Fajans, J., Hardy, W. N., Hunter, E. D., Martens, I., Robicheaux, F., Shanman, S., So, C., Wang, X., and Wurtele, J. S. Electron Plasmas Cooled by Cyclotron-Cavity Resonance. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.117.175001.
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Povilus, A. P., DeTal, N. D., Evans, L. T., Evetts, N., Fajans, J., Hardy, W. N., Hunter, E. D., Martens, I., Robicheaux, F., Shanman, S., So, C., Wang, X., & Wurtele, J. S. Electron Plasmas Cooled by Cyclotron-Cavity Resonance. United States. https://doi.org/10.1103/PhysRevLett.117.175001
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Povilus, A. P., DeTal, N. D., Evans, L. T., Evetts, N., Fajans, J., Hardy, W. N., Hunter, E. D., Martens, I., Robicheaux, F., Shanman, S., So, C., Wang, X., and Wurtele, J. S. Fri . "Electron Plasmas Cooled by Cyclotron-Cavity Resonance". United States. https://doi.org/10.1103/PhysRevLett.117.175001. https://www.osti.gov/servlets/purl/1438653.
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@article{osti_1438653,
title = {Electron Plasmas Cooled by Cyclotron-Cavity Resonance},
author = {Povilus, A. P. and DeTal, N. D. and Evans, L. T. and Evetts, N. and Fajans, J. and Hardy, W. N. and Hunter, E. D. and Martens, I. and Robicheaux, F. and Shanman, S. and So, C. and Wang, X. and Wurtele, J. S.},
abstractNote = {We observe that high-Q electromagnetic cavity resonances increase the cyclotron cooling rate of pure electron plasmas held in a Penning-Malmberg trap when the electron cyclotron frequency, controlled by tuning the magnetic field, matches the frequency of standing wave modes in the cavity. For certain modes and trapping configurations, this can increase the cooling rate by factors of 10 or more. In this paper, we investigate the variation of the cooling rate and equilibrium plasma temperatures over a wide range of parameters, including the plasma density, plasma position, electron number, and magnetic field.},
doi = {10.1103/PhysRevLett.117.175001},
journal = {Physical Review Letters},
number = 17,
volume = 117,
place = {United States},
year = {Fri Oct 21 00:00:00 EDT 2016},
month = {Fri Oct 21 00:00:00 EDT 2016}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevLett.117.175001
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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic of the experiment showing the electron gun, the microchannel plate (MCP), and the bulge cavity where modes are trapped. A “reservoir” of electrons (L ≈ 5 cm, N ≈ 108 e−) and the test electrons (L ≈ 1 cm, N ≈ 105 e−) are depicted inmore » blue. (b) The E⊥ cavity mode intensity patterns simulated by High-Frequency Structure Simulator, shown for two cavity modes in cross section. (c) Typical temperature measurement data (black) showing the plasma escaped charge as a function of the plasma confinement voltage, and the corresponding temperature fit (red).« less
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    Works referencing / citing this record:

    Low magnetic field cooling of lepton plasmas via cyclotron-cavity resonance
    journal, January 2018

    • Hunter, E. D.; Evetts, N.; Fajans, J.
    • Physics of Plasmas, Vol. 25, Issue 1
    • DOI: 10.1063/1.5006700
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