Quasilinear theory of collisionless Fermi acceleration in a multicusp magnetic confinement geometry

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dc.contributor.authorDewar, Robert
dc.contributor.authorCiubotariu, C
dc.date.accessioned2009-08-18T05:20:20Zen_US
dc.date.accessioned2010-12-20T06:03:43Z
dc.date.available2009-08-18T05:20:20Zen_US
dc.date.available2010-12-20T06:03:43Z
dc.date.issued1999en_US
dc.date.updated2015-12-12T09:36:39Z
dc.description.abstractParticle motion in a cylindrical multiple-cusp magnetic field configuration is shown to be highly (though not completely) chaotic, as expected by analogy with the Sinai billiard. This provides a collisionless, linear mechanism for phase randomization during monochromatic wave heating. A general quasilinear theory of collisionless energy diffusion is developed for particles with a Hamiltonian of the form H0+H1, motion in the unperturbed Hamiltonian H0 being assumed chaotic, while the perturbation H1 can be coherent (i.e., not stochastic). For the multicusp geometry, two heating mechanisms are identified—cyclotron resonance heating of particles temporarily mirrortrapped in the cusps, and nonresonant heating of nonadiabatically reflected particles (the majority). An analytically solvable model leads to an expression for a transit-time correction factor, exponentially decreasing with increasing frequency. The theory is illustrated using the geometry of a typical laboratory experiment.
dc.format12 pages
dc.identifier.citationPhysical Review, E, Statistical, Nonlinear and Soft Matter Physics 60.6 (1999): 7400-7411
dc.identifier.issn1539-3755en_US
dc.identifier.urihttp://hdl.handle.net/10440/710en_US
dc.identifier.urihttp://digitalcollections.anu.edu.au/handle/10440/710
dc.publisherAmerican Physical Society
dc.rightshttp://www.sherpa.ac.uk/romeo/index.php "Author can archive pre-print (ie pre-refereeing) … post-print (ie final draft post-refereeing) … [and] publisher's version/PDF. Link to publisher version … [and] Copyright notice required. Publisher's version/PDF can be used on … employers web site." - from SHERPA/RoMEO site (as at 25/02/10). ©1999 The American Physical Society
dc.sourcePhysical Review E-Statistical, Nonlinear and Soft Matter Physics
dc.source.urihttp://prola.aps.org/abstract/PRE/v60/i6/p7400_1en_US
dc.titleQuasilinear theory of collisionless Fermi acceleration in a multicusp magnetic confinement geometry
dc.typeJournal article
local.bibliographicCitation.issue6
local.bibliographicCitation.lastpage7411
local.bibliographicCitation.startpage7400
local.contributor.affiliationDewar, Robert, Research School of Physical Sciences and Engineering, Plasma Research Laboratoryen_US
local.contributor.affiliationCiubotariu, C, University of Lethbridge, Canadaen_US
local.contributor.authoruidU8203580en_US
local.contributor.authoruidE7036en_US
local.description.refereedYes
local.identifier.absfor020204en_US
local.identifier.ariespublicationMigratedxPub24886en_US
local.identifier.citationvolume60
local.identifier.doi10.1103/PhysRevE.60.7400
local.identifier.scopusID2-s2.0-0442319798
local.identifier.uidSubmittedByu8103816en_US
local.type.statusPublished Versionen_US

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