Aachen PK 2003 – wissenschaftliches Programm
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P: Plasmaphysik
P 4: Poster I
P 4.42: Poster
Montag, 17. März 2003, 17:45–19:15, Foyer
Atomic Modelling of Non-Maxwellian Plasmas — •P. Bryans1, M. Torney1, R. Bingham1,2, B.J. Kellet2, and H.P. Summers1 — 1Department of Physics, University of Strathclyde, Glasgow, Scotland — 2Rutherford Appleton Laboratory, Oxfordshire, England
Important plasmas in the laboratory and astrophysical domains display non-Maxwellian electron distributions. In cometary & planetary atmospheres, and in supernova remnants, streaming instabilities enhance the high energy part of the distribution function, while in near neutral discharge plasmas, electron energy loss mechanisms cause its depletion. The consequence for spectral emission from such plasmas is significant and of diagnostic potential.
A new systematic approach to non-Maxwellian modelling of ion populations in plasmas is described. Modified forms of the key fundamental data formats required for the population modelling are prepared corresponding to families of non-Maxwellians. The full machinery of effective emission, ionisation, recombination and ionisation stage distribution is thereby enabled. The development does place tight requirements on underlying collision cross- section source, which are being addressed, and to which attention is drawn.
The procedures are demonstrated for several distribution functions of relevance to astrophysics. The sensitivity of spectral emission features, for the comets C/LINEAR 1999 S4 and McNaught-Hartley, to the expected distribution functions is examined.