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

Hunter, E. D.; Evetts, N.; Fajans, J.; Hardy, W. N.; Landsberger, H.; Mcpeters, R.; Wurtele, J. S.

doi:10.1063/1.5006700

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

Journal Article · Tue Dec 12 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5006700· OSTI ID:1523259

Hunter, E. D. ^[1]; Evetts, N. ^[2];

^[1]; Hardy, W. N. ^[2];

^[1]; Mcpeters, R. ^[1]; Wurtele, J. S. ^[1]

Univ. of California, Berkeley, CA (United States). Dept. of Physics
Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Physics and Astronomy

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.

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Research Organization:: Univ. of California, Berkeley, CA (United States); Univ. of British Columbia, Vancouver, BC (Canada)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC)

Grant/Contract Number:: FG02-06ER54904; 1500538-PHY

OSTI ID:: 1523259

Alternate ID(s):: OSTI ID: 1413008

Journal Information:: Physics of Plasmas, Vol. 25, Issue 1; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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