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Title
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The origin of Bohm diffusion, investigated by a comparison of different modelling methods
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Author
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Abstract
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| 'Bohm diffusion' causes the electrons to diffuse perpendicularly to the magnetic field lines. However, its origin is not yet completely understood: low and high frequency electric field fluctuations are both named to cause Bohm diffusion. The importance of including this process in a Monte Carlo (MC) model is demonstrated by comparing calculated ionization rates with particle-in-cell/Monte Carlo collisions (PIC/MCC) simulations. A good agreement is found with a Bohm diffusion parameter of 0.05, which corresponds well to experiments. Since the PIC/MCC method accounts for fast electric field fluctuations, we conclude that Bohm diffusion is caused by fast electric field phenomena. |
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Language
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English
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Source (journal)
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Journal of physics: D: applied physics. - London
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Publication
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London
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2010
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ISSN
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0022-3727
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Volume/pages
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43
:29
(2010)
, p. 292001,1-292001,5
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ISI
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000279638700001
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Full text (Publisher's DOI)
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