Self-consistent generation of superthermal electrons by beam-plasma interaction
SCIE
SCOPUS
- Title
- Self-consistent generation of superthermal electrons by beam-plasma interaction
- Authors
- Yoon, PH; Rhee, T; Ryu, CM
- Date Issued
- 2005-11-18
- Publisher
- AMERICAN PHYSICAL SOC
- Abstract
- It has been known since the early days of plasma physics research that superthermal electrons are generated during beam-plasma laboratory experiments. Superthermal electrons (the kappa distribution) are also ubiquitously observed in space. To explain such a feature, various particle acceleration mechanisms have been proposed. However, self-consistent acceleration of electrons in the context of plasma kinetic theory has not been demonstrated to date. This Letter reports such a demonstration. It is shown that the collisionality, defined via the "plasma parameter" g=1/n lambda(3)(D), plays a pivotal role. It is found that a small but moderately finite value of g is necessary for the superthermal tail to be generated, implying that purely collisionless (g=0) Vlasov theory cannot produce a superthermal population.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12433
- DOI
- 10.1103/PhysRevLett.95.215003
- ISSN
- 0031-9007
- Article Type
- Article
- Citation
- PHYSICAL REVIEW LETTERS, vol. 95, no. 21, page. 215003-1 - 215003-4, 2005-11-18
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