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Uniformity of fuel target implosion in heavy ion fusion

Published online by Cambridge University Press:  09 July 2015

S. Kawata*
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan Center for Optical Research and Education (CORE), Utsunomiya University, Utsunomiya, Japan
K. Noguchi
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
T. Suzuki
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
T. Karino
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
D. Barada
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan Center for Optical Research and Education (CORE), Utsunomiya University, Utsunomiya, Japan
A.I. Ogoyski
Affiliation:
Department of Physics, Technical University of Varna, Ulitska, Varna, Bulgaria
Y.Y. Ma
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan Center for Optical Research and Education (CORE), Utsunomiya University, Utsunomiya, Japan
*
Address correspondence and reprint requests to: Shigeo Kawata, Graduate School of Engineering, Utsunomiya University, Yohtoh 7-1-2, Utsunomiya 321-8585, Japan. E-mail: kwt@cc.utsunomiya-u.ac.jp

Abstract

In inertial confinement fusion the target implosion non-uniformity is introduced by a driver beams’ illumination non-uniformity, a fuel target alignment error in a fusion reactor, the target fabrication defect, etc. For a steady operation of a fusion power plant the target implosion should be robust against the implosion non-uniformities. In this paper the requirement for the implosion uniformity is first discussed. The implosion uniformity should be less than a few percent. A study on the fuel hotspot dynamics is also presented and shows that the stagnating plasma fluid provides a significant enhancement of vorticity at the final stage of the fuel stagnation. Then non-uniformity mitigation mechanisms of the heavy-ion beam (HIB) illumination are also briefly discussed in heavy ion inertial fusion (HIF). A density valley appears in the energy absorber, and the large-scale density valley also works as a radiation energy confinement layer, which contributes to a radiation energy smoothing. In HIF a wobbling HIB illumination was also introduced to realize a uniform implosion. In the wobbling HIBs illumination, the illumination non-uniformity oscillates in time and space on a HIF target. The oscillating-HIB energy deposition may contribute to the reduction of the HIBs’ illumination non-uniformity by its smoothing effect on the HIB illumination non-uniformity and also by a growth mitigation effect on the Rayleigh–Taylor instability.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2015 

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