Spontaneous multi-keV electron generation in a low-RF-power axisymmetric mirror machine
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https://www.osti.gov/servlets/purl/1562006/
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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.
提供机构：
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
创建时间：
2019-09-17
