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Title:
Energy gain calculations in Penning fusion systems using a bounce-averaged Fokker-Planck model
Authors:
Chacón, L.; Miley, G. H.; Barnes, D. C.; Knoll, D. A.
Affiliation:
AA(University of Illinois at Urbana-Champaign, 103 South Goodwin Avenue, Urbana, Illinois 61801), AB(University of Illinois at Urbana-Champaign, 103 South Goodwin Avenue, Urbana, Illinois 61801), AC(Los Alamos National Laboratory, Los Alamos, New Mexico 87545), AD(Los Alamos National Laboratory, Los Alamos, New Mexico 87545)
Publication:
Physics of Plasmas, Volume 7, Issue 11, pp. 4547-4560 (2000). (PhPl Homepage)
Publication Date:
11/2000
Origin:
AIP
PACS Keywords:
Plasma kinetic equations, Electrostatic and high-frequency confinement, Fokker-Planck and Vlasov equation
Abstract Copyright:
2000: American Institute of Physics
DOI:
10.1063/1.1310199
Bibliographic Code:
2000PhPl....7.4547C

Abstract

In spherical Penning fusion devices, a spherical cloud of electrons, confined in a Penning-like trap, creates the ion-confining electrostatic well. Fusion energy gains for these systems have been calculated in optimistic conditions (i.e., spherically uniform electrostatic well, no collisional ion-electron interactions, single ion species) using a bounce-averaged Fokker-Planck (BAFP) model. Results show that steady-state distributions in which the Maxwellian ion population is dominant correspond to lowest ion recirculation powers (and hence highest fusion energy gains). It is also shown that realistic parabolic-like wells result in better energy gains than square wells, particularly at large well depths (>100 kV). Operating regimes with fusion power to ion input power ratios (Q-value) >100 have been identified. The effect of electron losses on the Q-value has been addressed heuristically using a semianalytic model, indicating that large Q-values are still possible provided that electron particle losses are kept small and well depths are large.
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