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Title: Low magnetic field cooling of lepton plasmas via cyclotron-cavity resonance

Abstract

Pure electron or pure positron plasmas held in magnetic fields B radiate energy because of the cyclotron motion of the plasma particles; nominally, the plasmas should cool to the often cryogenic temperatures of the trap in which they are confined. However, the cyclotron cooling rate for leptons is (1/4 s)(B/1 T)2, and significant cooling is not normally observed unless B 1 T . Cooling to the trap temperatures of ~10 K is particularly difficult to attain. Here, we show that dramatically higher cooling rates (×100) and lower temperatures (:1000) can be obtained if the plasmas are held in electromagnetic cavities rather than in effectively free space conditions. We find that plasmas with up to 107 particles can be cooled in fields close to 0.15 T, much lower than 1 T commonly thought to be necessary to obtain plasma cooling. Appropriate cavities can be constructed with only minor modifications to the standard Penning-Malmberg trap structures.

Authors:
 [1];  [2]; ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (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:
1523259
Alternate Identifier(s):
OSTI ID: 1413008
Grant/Contract Number:  
FG02-06ER54904; 1500538-PHY
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Hunter, E. D., Evetts, N., Fajans, J., Hardy, W. N., Landsberger, H., Mcpeters, R., and Wurtele, J. S. Low magnetic field cooling of lepton plasmas via cyclotron-cavity resonance. United States: N. p., 2017. Web. doi:10.1063/1.5006700.
Hunter, E. D., Evetts, N., Fajans, J., Hardy, W. N., Landsberger, H., Mcpeters, R., & Wurtele, J. S. Low magnetic field cooling of lepton plasmas via cyclotron-cavity resonance. United States. doi:10.1063/1.5006700.
Hunter, E. D., Evetts, N., Fajans, J., Hardy, W. N., Landsberger, H., Mcpeters, R., and Wurtele, J. S. Tue . "Low magnetic field cooling of lepton plasmas via cyclotron-cavity resonance". United States. doi:10.1063/1.5006700. https://www.osti.gov/servlets/purl/1523259.
@article{osti_1523259,
title = {Low magnetic field cooling of lepton plasmas via cyclotron-cavity resonance},
author = {Hunter, E. D. and Evetts, N. and Fajans, J. and Hardy, W. N. and Landsberger, H. and Mcpeters, R. and Wurtele, J. S.},
abstractNote = {Pure electron or pure positron plasmas held in magnetic fields B radiate energy because of the cyclotron motion of the plasma particles; nominally, the plasmas should cool to the often cryogenic temperatures of the trap in which they are confined. However, the cyclotron cooling rate for leptons is (1/4 s)(B/1 T)2, and significant cooling is not normally observed unless B≳1 T. Cooling to the trap temperatures of ~10 K is particularly difficult to attain. Here, we show that dramatically higher cooling rates (×100) and lower temperatures (:1000) can be obtained if the plasmas are held in electromagnetic cavities rather than in effectively free space conditions. We find that plasmas with up to 107 particles can be cooled in fields close to 0.15 T, much lower than 1 T commonly thought to be necessary to obtain plasma cooling. Appropriate cavities can be constructed with only minor modifications to the standard Penning-Malmberg trap structures.},
doi = {10.1063/1.5006700},
journal = {Physics of Plasmas},
number = 1,
volume = 25,
place = {United States},
year = {2017},
month = {12}
}

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Figures / Tables:

FIG. 1 FIG. 1: (a) Sectioned schematic of the Penning-Malmberg trap used in these experiments. Radial confinement is provided by an axial magnetic field B, and axial confinement is provided by potentials applied to the trap electrodes. Electrons are injected into the trap from an electron gun (E) and plasmas are storedmore » in Cavity 2. The plasma temperature and the number of plasma particles are determined by releasing the plasma onto the microchannel plate (MCP)–phosphor screen detector (M). Irises (not shown) are present on both ends of the system. (b) The simulated electric field intensity for the TE111 cavity mode.« less

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