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

Abstract

Title:Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machineAbstract:X-ray emission shows the existence of multi-keV 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 suggest that collisionless scattering -- mu non-conservation 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 are 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-acceleration-like mechanism is presented, with mu non-conservation in the static vacuum field as an essential feature.

Authors:
;
Publication Date:
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
U. S. Department of Energy
OSTI Identifier:
1562006
DOI:
https://doi.org/10.11578/1562006

Citation Formats

Swanson, C, and Cohen, S A. Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine. United States: N. p., 2019. Web. doi:10.11578/1562006.
Swanson, C, & Cohen, S A. Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine. United States. doi:https://doi.org/10.11578/1562006
Swanson, C, and Cohen, S A. 2019. "Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine". United States. doi:https://doi.org/10.11578/1562006. https://www.osti.gov/servlets/purl/1562006. Pub date:Wed May 01 00:00:00 EDT 2019
@article{osti_1562006,
title = {Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine},
author = {Swanson, C and Cohen, S A},
abstractNote = {Title:Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machineAbstract:X-ray emission shows the existence of multi-keV 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 suggest that collisionless scattering -- mu non-conservation 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 are 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-acceleration-like mechanism is presented, with mu non-conservation in the static vacuum field as an essential feature.},
doi = {10.11578/1562006},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {5}
}