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Title:
Low beta confinement in a Polywell modelled with conventional point cusp theories
Authors:
Carr, Matthew; Gummersall, David; Cornish, Scott; Khachan, Joe
Affiliation:
AA(Nuclear Fusion Physics Group, School of Physics A28, University of Sydney, NSW 2006, Australia), AB(Nuclear Fusion Physics Group, School of Physics A28, University of Sydney, NSW 2006, Australia), AC(Nuclear Fusion Physics Group, School of Physics A28, University of Sydney, NSW 2006, Australia), AD(Nuclear Fusion Physics Group, School of Physics A28, University of Sydney, NSW 2006, Australia)
Publication:
Physics of Plasmas, Volume 18, Issue 11, article id. 112501 9 pp. (2011). (PhPl Homepage)
Publication Date:
11/2011
Origin:
AIP
Keywords:
fusion reactor theory, magnetic traps, plasma inertial confinement, plasma transport processes
PACS Keywords:
Field-reversed configurations rotamaks astrons ion rings magnetized target fusion and cusps, Electrostatic and high-frequency confinement, Theory design and computerized simulation, Particle orbits, Transport properties
Abstract Copyright:
2011: American Institute of Physics
DOI:
10.1063/1.3655446
Bibliographic Code:
2011PhPl...18k2501C

Abstract

The magnetic field structure in a Polywell device is studied to understand both the physics underlying the electron confinement properties and its estimated performance compared to other cusped devices. Analytical expressions are presented for the magnetic field in addition to expressions for the point and line cusps as a function of device parameters. It is found that at small coil spacings, it is possible for the point cusp losses to dominate over the line cusp losses, leading to longer overall electron confinement. The types of single particle trajectories that can occur are analysed in the context of the magnetic field structure which results in the ability to define two general classes of trajectories, separated by a critical flux surface. Finally, an expression for the single particle confinement time is proposed and subsequently compared with simulation.
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