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Chaoticity threshold in magnetized plasmas: Numerical results in the weak coupling regime (Articolo in rivista)

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Chaoticity threshold in magnetized plasmas: Numerical results in the weak coupling regime (Articolo in rivista) (literal)

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Carati A.; Benfenati F.; Maiocchi A.; Zuin M.; Galgani L. (2014)
Chaoticity threshold in magnetized plasmas: Numerical results in the weak coupling regime
in Chaos (Woodbury N.Y.); AMER INST PHYSICS, MELVILLE, NY 11747-4501 USA (Stati Uniti d'America)
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Article Number: 013118. Chaos (Woodbury N. Y. Online) Attiva dal: 1991 Editore: American Institute of Physics - Woodbury, NY Paese di pubblicazione: Stati Uniti d'America Lingua: inglese e-Issn: 1089-7682 Titolo chiave: Chaos (Woodbury N. Y. Online) Titolo proprio: Chaos (Woodbury N. Y. Online) Titolo abbreviato: Chaos (Woodbury N. Y. Online) (literal)

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http://scitation.aip.org/docserver/fulltext/aip/journal/chaos/24/1/1.4865255.pdf?expires=1401981747&id=id&accname=477777&checksum=9F461DDA101846201640CC0ADECC3B00 (literal)

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1,2,3,5 : Università degli Studi di Milano, Milano, Italy / 4 : Consorzio RFX, Associazione EURATOM-ENEA sulla Fusione, Padova, Italy. (literal)

Titolo

Chaoticity threshold in magnetized plasmas: Numerical results in the weak coupling regime (literal)

Abstract

The present paper is a numerical counterpart to the theoretical work [Carati et al., Chaos 22, 033124 (2012)]. We are concerned with the transition from order to chaos in a one-component plasma (a system of point electrons with mutual Coulomb interactions, in a uniform neutralizing background), the plasma being immersed in a uniform stationary magnetic field. In the paper [Carati et al., Chaos 22, 033124 (2012)], it was predicted that a transition should take place when the electron density is increased or the field decreased in such a way that the ratio omega(p)/omega(c) between plasma and cyclotron frequencies becomes of order 1, irrespective of the value of the so-called Coulomb coupling parameter Gamma. Here, we perform numerical computations for a first principles model of N point electrons in a periodic box, with mutual Coulomb interactions, using as a probe for chaoticity the time-autocorrelation function of magnetization. We consider two values of Gamma (0.04 and 0.016) in the weak coupling regime Gamma << 1, with N up to 512. A transition is found to occur for omega(p)/omega(c) in the range between 0.25 and 2, in fairly good agreement with the theoretical prediction. These results might be of interest for the problem of the breakdown of plasma confinement in fusion machines. (literal)

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