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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, Skolan för elektroteknik och datavetenskap (EECS), Rymd- och plasmafysik. st Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy..ORCID-id: 0000-0001-9632-8104
KTH, Skolan för elektroteknik och datavetenskap (EECS), Rymd- och plasmafysik.ORCID-id: 0000-0002-6712-3625
Vise andre og tillknytning
2018 (engelsk)Inngår i: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 84, nr 3, artikkel-id 905840308Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
CAMBRIDGE UNIV PRESS , 2018. Vol. 84, nr 3, artikkel-id 905840308
Emneord [en]
plasma properties, plasma simulation
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-240044DOI: 10.1017/S0022377818000491ISI: 000450962300009Scopus ID: 2-s2.0-85069170632OAI: oai:DiVA.org:kth-240044DiVA, id: diva2:1269218
Forskningsfinansiär
Swedish Research Council
Merknad

QC 20181210

Tilgjengelig fra: 2018-12-10 Laget: 2018-12-10 Sist oppdatert: 2019-10-04bibliografisk kontrollert

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