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

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 (...

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Bibliographic Details
Published in:Physics of plasmas 2018-01, Vol.25 (1)
Main Authors: Hunter, E. D., Evetts, N., Fajans, J., Hardy, W. N., Landsberger, H., Mcpeters, R., Wurtele, J. S.
Format: Article
Language:English
Subjects:
Construction standards
Cooling
Cooling rate
Cryogenic temperature
Cyclotron resonance
Holes
Leptons
Magnetic fields
Magnetic resonance
Plasma
Plasma cooling
Plasma physics
Plasmas (physics)
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Summary: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.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5006700