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A comparison of weak-turbulence and particle-in-cell simulations of weak electron-beam plasma interaction
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Ratcliffe, Heather, Brady, Christopher S., Che Rozenan, M. B. and Nakariakov, V. M. (Valery M.) (2014) A comparison of weak-turbulence and particle-in-cell simulations of weak electron-beam plasma interaction. Physics of Plasmas, Volume 21 (Number 12). Article number 122104. doi:10.1063/1.4904065
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Official URL: http://dx.doi.org/10.1063/1.4904065
Abstract
Quasilinear theory has long been used to treat the problem of a weak electron beam interacting with plasma and generating Langmuir waves. Its extension to weak-turbulence theory treats resonant interactions of these Langmuir waves with other plasma wave modes, in particular, ion-sound waves. These are strongly damped in plasma of equal ion and electron temperatures, as sometimes seen in, for example, the solar corona and wind. Weak turbulence theory is derived in the weak damping limit, with a term describing ion-sound wave damping then added. In this paper, we use the EPOCH particle-in-cell code to numerically test weak turbulence theory for a range of electron-ion temperature ratios. We find that in the cold ion limit, the results agree well, but for increasing ion temperature the three-wave resonance becomes broadened in proportion to the ion-sound wave damping rate. Additionally, we establish lower limits on the number of simulation particles needed to accurately reproduce the electron and wave distributions in their saturated states and to reproduce their intermediate states and time evolution. These results should be taken into consideration in, for example, simulations of plasma wave generation in the solar corona of Type III solar radio bursts from the corona to the solar wind and in weak turbulence investigations of ion-acoustic lines in the ionosphere.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||||||
| Journal or Publication Title: | Physics of Plasmas | ||||||||
| Publisher: | American Institute of Physics | ||||||||
| ISSN: | 1070-664X | ||||||||
| Official Date: | 11 December 2014 | ||||||||
| Dates: |
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| Volume: | Volume 21 | ||||||||
| Number: | Number 12 | ||||||||
| Article Number: | Article number 122104 | ||||||||
| DOI: | 10.1063/1.4904065 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Adapted As: | Received 15 October 2014 Accepted 30 November 2014 Published online 11 December 2014 |
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