Quasilinear theory of collisionless Fermi acceleration in a multicusp magnetic confinement geometry
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Particle 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...[Show more]
dc.contributor.author | Dewar, Robert | |
---|---|---|
dc.contributor.author | Ciubotariu, C | |
dc.date.accessioned | 2009-08-18T05:20:20Z | |
dc.date.accessioned | 2010-12-20T06:03:43Z | |
dc.date.available | 2009-08-18T05:20:20Z | |
dc.date.available | 2010-12-20T06:03:43Z | |
dc.identifier.citation | Physical Review, E, Statistical, Nonlinear and Soft Matter Physics 60.6 (1999): 7400-7411 | |
dc.identifier.issn | 1539-3755 | |
dc.identifier.uri | http://hdl.handle.net/10440/710 | |
dc.identifier.uri | http://digitalcollections.anu.edu.au/handle/10440/710 | |
dc.description.abstract | Particle 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.format | 12 pages | |
dc.publisher | American Physical Society | |
dc.rights | http://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.source | Physical Review E-Statistical, Nonlinear and Soft Matter Physics | |
dc.source.uri | http://prola.aps.org/abstract/PRE/v60/i6/p7400_1 | |
dc.title | Quasilinear theory of collisionless Fermi acceleration in a multicusp magnetic confinement geometry | |
dc.type | Journal article | |
local.description.refereed | Yes | |
local.identifier.citationvolume | 60 | |
dc.date.issued | 1999 | |
local.identifier.absfor | 020204 | |
local.identifier.ariespublication | MigratedxPub24886 | |
local.type.status | Published Version | |
local.contributor.affiliation | Dewar, Robert, Research School of Physical Sciences and Engineering, Plasma Research Laboratory | |
local.contributor.affiliation | Ciubotariu, C, University of Lethbridge, Canada | |
local.bibliographicCitation.issue | 6 | |
local.bibliographicCitation.startpage | 7400 | |
local.bibliographicCitation.lastpage | 7411 | |
local.identifier.doi | 10.1103/PhysRevE.60.7400 | |
dc.date.updated | 2015-12-12T09:36:39Z | |
local.identifier.scopusID | 2-s2.0-0442319798 | |
Collections | ANU Research Publications |
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