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Direct-indirect mixture implosion in heavy ion fusion

Published online by Cambridge University Press:  21 September 2006

TETSUO SOMEYA ,
KENTAROU MIYAZAWA ,
TAKASHI KIKUCHI  and
SHIGEO KAWATA
TETSUO SOMEYA
Affiliation:
Department of Energy and Environmental Science, Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
KENTAROU MIYAZAWA
Affiliation:
Department of Energy and Environmental Science, Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
TAKASHI KIKUCHI
Affiliation:
Department of Energy and Environmental Science, Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
SHIGEO KAWATA
Affiliation:
Department of Energy and Environmental Science, Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
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Abstract

In order to realize an effective implosion, the beam illumination non-uniformity and implosion non-uniformity must be suppressed to less than a few percent. In this paper, a direct-indirect mixture implosion mode is proposed and discussed in heavy ion beam (HIB) inertial confinement fusion (HIF) in order to release sufficient fusion energy in a robust manner. On the other hand, the HIB illumination non-uniformity depends strongly on a target displacement (dz) in a reactor. In a direct-driven implosion mode dz of ∼20 μm was tolerance and in an indirect-implosion mode dz of ∼100 μm was allowable. In the direct-indirect mixture mode target, a low-density foam layer is inserted, and radiation is confined in the foam layer. In the foam layer the radiation transport is expected in the lateral direction for the HIB illumination non-uniformity smoothing. Two-dimensional implosion simulations are performed and show that the HIB illumination non-uniformity is well smoothed. The simulation results present that a large pellet displacement of ∼300 μm is tolerable in order to obtain sufficient fusion energy in HIF.

Keywords

Heavy ion beamImplosion non-uniformityInertial confinement fusionPellet gainRadiation transport
Type
Research Article
Information
Laser and Particle Beams , Volume 24 , Issue 3 , September 2006 , pp. 359 - 369
Copyright
© 2006 Cambridge University Press

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