Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine

Swanson, Charles; Cohen, S. A.

doi:10.1063/1.5093905

Title: Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine

Journal Article · Fri Jun 07 00:00:00 EDT 2019 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5093905· OSTI ID:1543453

^[1];

^[2]

Princeton Satellite Systems, Plainsboro, NJ (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

X-ray emission reflects the existence of multikilo-electron-volt electrons in low-temperature, low-power, capacitively coupled RF-heated magnetic-mirror plasmas that also contain a warm (300 eV) minority electron population. Though these warm electrons are initially passing particles, we imply that collisionless scattering—μ nonconservation in the static vacuum field—is responsible for a minority of them to persist in the mirror cell for thousands of transits during which time a fraction is energized to a characteristic temperature of 3 keV, with some electrons reaching energies above 30 keV. A heuristic model of the heating by a Fermi-accelerationlike mechanism is shown, with μ nonconservation in the static vacuum field as an essential feature.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1543453

Alternate ID(s):: OSTI ID: 1525335

Journal Information:: Physics of Plasmas, Vol. 26, Issue 6; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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References (26)

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