 |
| Titel |
Ion dynamics in electron beam–plasma interaction: particle-in-cell simulations |
| VerfasserIn |
K. Baumgärtel |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 8 ; Nr. 32, no. 8 (2014-08-22), S.1025-1033 |
| Datensatznummer |
250121099
|
| Publikation (Nr.) |
 copernicus.org/angeo-32-1025-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Electron beam–plasma interaction including ions is studied by
particle-in-cell (PIC) simulations using a one-dimensional, electrostatic
code. Evidence for Langmuir wave decay is given for sufficiently energetic
beams, as in previous Vlasov–Maxwell simulations. The mechanism for the
generation of localized finite-amplitude ion density fluctuations is
analyzed. Amplitude modulation due to interference between the
beam-generated Langmuir waves causes random wave localization including
strong transient spikes in field intensity which create bursty ion density
structures via ponderomotive forces. More dense beams may quench the decay
instability and generate low-frequency variations dominated by the
wave number of the fastest growing Langmuir mode. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|