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Molecular dynamics calculation of the spectral densities of plasma fluctuations
Univ Bari, Dept Chem, I-70126 Bari, Italy.;CNR, Inst Nanotechnol NANOTEC, I-70126 Bari, Italy..
CNR, Inst Nanotechnol NANOTEC, I-70126 Bari, Italy..
KTH, School of Electrical Engineering and Computer Science (EECS), Space and Plasma Physics. st Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy..ORCID iD: 0000-0001-9632-8104
KTH, School of Electrical Engineering and Computer Science (EECS), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
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2018 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 84, no 3, article id 905840308Article in journal (Refereed) Published
Abstract [en]

Spectral densities of plasma fluctuations are calculated for the thermal case using classical molecular dynamics (MD) assuming Coulomb interactions and a short-range cutoff radius. The aim of the calculation is to verify limits and performances of such calculations in the light of possible generalizations, e.g. collisional or non-ideal plasmas. Results are presented for ideal, collisionless, fully ionized thermal plasmas. Comparison with the analytical theory reveals a generally satisfactory agreement with possibility for improvement when more strict numerical parameters are used albeit with a strong increase in computational cost. The largest deviations have been observed in the vicinity of the weakly damped eigenmodes. The agreement is strong in other parts of the spectrum, where Landau damping is prominent, and overcomes the effects stemming from the excess collisionality and coupling as well as from the exclusion of short-range collisions.

Place, publisher, year, edition, pages
CAMBRIDGE UNIV PRESS , 2018. Vol. 84, no 3, article id 905840308
Keywords [en]
plasma properties, plasma simulation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-240044DOI: 10.1017/S0022377818000491ISI: 000450962300009OAI: oai:DiVA.org:kth-240044DiVA, id: diva2:1269218
Funder
Swedish Research Council
Note

QC 20181210

Available from: 2018-12-10 Created: 2018-12-10 Last updated: 2018-12-10Bibliographically approved

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Tolias, PanagiotisRatynskaia, Svetlana V.

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