B.E.R. Williams
Heat flux effects on magnetic field dynamics in solid density plasmas traversed by relativistic electron beams
Williams, B.E.R.; Kingham, R.J.; Bissell, J.J.
Authors
R.J. Kingham
J.J. Bissell
Abstract
Relativistic electron beam propagation through solid density plasma is a rich area for magnetic field dynamics. It is well known that Ohmic heating of the background plasma caused by the beam significantly affects magnetic field generation, primarily through changes in the resistivity. In particular, temperature changes in the background plasma leads to the generation of a magnetic field that acts to deflect relativistic electrons from the beam axis. This 'beam hollowing' field could have disastrous implications for the fast ignitor scheme. In this paper, the effects of background heat flow on magnetic field generation are considered, first with a simple analytic investigation, and then with 1D Vlasov Fokker–Planck and classical transport simulations using a rigid beam for the fast electrons. It is shown that the thermal conduction of the background plasma acts to diffuse the temperature, reducing both the temperature gradients and the beam hollowing field. This gives rise to the re-emergence of a collimating magnetic field. The influence of the background heat flux is also investigated in the context of solids with imposed resistivity gradients, and is shown to significantly enhance the magnetic field present. More exotic transport effects, such as an enhanced Nernst velocity (due to non-local heat flux) and double peaked temperature profiles (due to distortion of the heating and heat-flow profiles by the magnetic field), are also reported.
Citation
Williams, B., Kingham, R., & Bissell, J. (2013). Heat flux effects on magnetic field dynamics in solid density plasmas traversed by relativistic electron beams. Plasma Physics and Controlled Fusion, 55(9), https://doi.org/10.1088/0741-3335/55/9/095005
Journal Article Type | Article |
---|---|
Publication Date | Sep 1, 2013 |
Deposit Date | Jul 6, 2013 |
Publicly Available Date | Dec 9, 2014 |
Journal | Plasma Physics and Controlled Fusion |
Print ISSN | 0741-3335 |
Electronic ISSN | 1361-6587 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 55 |
Issue | 9 |
DOI | https://doi.org/10.1088/0741-3335/55/9/095005 |
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Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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