Two-dimensional PIC simulations of ion beam instabilities in Supernova-driven plasma flows

Dieckmann, ME; Meli, A; Shukla, PK; Drury, LOC; Mastichiadis, A

dc.contributor.author	Dieckmann, ME	en
dc.contributor.author	Meli, A	en
dc.contributor.author	Shukla, PK	en
dc.contributor.author	Drury, LOC	en
dc.contributor.author	Mastichiadis, A	en
dc.date.accessioned	2014-03-01T01:57:38Z
dc.date.available	2014-03-01T01:57:38Z
dc.date.issued	2008	en
dc.identifier.issn	0741-3335	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/28459
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.classification	Physics, Nuclear	en
dc.subject.other	MAGNETIC-FIELD GENERATION	en
dc.subject.other	PARTICLE-ACCELERATION	en
dc.subject.other	ELECTRON ACCELERATION	en
dc.subject.other	COLLISIONLESS SHOCKS	en
dc.subject.other	COSMIC-RAYS	en
dc.subject.other	2-STREAM INSTABILITY	en
dc.subject.other	DYNAMICS	en
dc.subject.other	WAVES	en
dc.subject.other	AMPLIFICATION	en
dc.subject.other	REFORMATION	en
dc.title	Two-dimensional PIC simulations of ion beam instabilities in Supernova-driven plasma flows	en
heal.type	journalArticle	en
heal.identifier.secondary	065020	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	Supernova remnant blast shells can reach the flow speed v(s) = 0.1c and shocks form at its front. Instabilities driven by shock-reflected ion beams heat the plasma in the foreshock, which may inject particles into diffusive acceleration. The ion beams can have the speed v(b) approximate to v(s). For v(b) << v(s) the Buneman or upper-hybrid instabilities dominate, while for v(b) >> v(s) the filamentation and mixed modes grow faster. Here the relevant waves for v(b) approximate to vs are examined and how they interact nonlinearly with the particles. The collision of two plasma clouds at the speed v(s) is modelled with particle-in-cell simulations, which convect with them magnetic fields oriented perpendicular to their flow velocity vector. One simulation models equally dense clouds and the other one uses a density ratio of 2. Both simulations show upper-hybrid waves that are planar over large spatial intervals and that accelerate electrons to similar to 10 keV. The symmetric collision yields only short oscillatory wave pulses, while the asymmetric collision also produces large-scale electric fields, probably through a magnetic pressure gradient. The large-scale fields destroy the electron phase space holes and they accelerate the ions, which facilitates the formation of a precursor shock.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	PLASMA PHYSICS AND CONTROLLED FUSION	en
dc.identifier.isi	ISI:000256544000021	en
dc.identifier.volume	50	en
dc.identifier.issue	6	en