The design and characterization of toroidal-shaped NOVA hohlraums that simulate National Ignition Facility plasma conditions for plasma instability experiments

Wilde, B. H.; Fernández, J. C.; Hsing, W. W.; Cobble, J. A.; Delamater, N. D.; Failor, B. H.; Krauser, William J.; Lindman, E. L.

doi:10.1063/1.50440

Cited by 1 publication

(2 citation statements)

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“…An alternative approach to producing long-scale-length, low-Z plasmas on Nova was pursued that used large toroidally shaped gas-filled hohlraums ͑Fernandez et al, 1996a; Wilde et al, 1996;Fernandez et al, 2000͒. The hohlraum is illustrated in Fig.…”

Section: Toroidal Hohlraumsmentioning

confidence: 99%

“…Note that the n e /n c plateau is about 1 mm in length, with a value dependent on the gas fill. For C 5 H 12 , T e Ϸ3 keV has been measured spectroscopically ͑Fernandez et Wilde et al, 1996͒, and T e ϭ2.50 Ϯ0.25 keV has been measured by collective Thomson scattering ͑Glenzer, 1998͒ along the hohlraum axis near the hohl- raum midplane ͑Fig. 3-31, bottom left͒.…”

Section: Toroidal Hohlraumsmentioning

confidence: 99%

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The physics basis for ignition using indirect-drive targets on the National Ignition Facility

Lindl¹,

Amendt²,

Berger³

et al. 2004

Physics of Plasmas

1,719

997

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The 1990 National Academy of Science final report of its review of the Inertial Confinement Fusion Program recommended completion of a series of target physics objectives on the 10-beam Nova laser at the Lawrence Livermore National Laboratory as the highest-priority prerequisite for proceeding with construction of an ignition-scale laser facility, now called the National Ignition Facility ͑NIF͒. These objectives were chosen to demonstrate that there was sufficient understanding of the physics of ignition targets that the laser requirements for laboratory ignition could be accurately specified. This research on Nova, as well as additional research on the Omega laser at the University of Rochester, is the subject of this review. The objectives of the U.S. indirect-drive target physics program have been to experimentally demonstrate and predictively model hohlraum characteristics, as well as capsule performance in targets that have been scaled in key physics variables from NIF targets. To address the hohlraum and hydrodynamic constraints on indirect-drive ignition, the target physics program was divided into the Hohlraum and Laser-Plasma Physics ͑HLP͒ program and the Hydrodynamically Equivalent Physics ͑HEP͒ program. The HLP program addresses laser-plasma coupling, x-ray generation and transport, and the development of energy-efficient hohlraums that provide the appropriate spectral, temporal, and spatial x-ray drive. The HEP experiments address the issues of hydrodynamic instability and mix, as well as the effects of flux asymmetry on capsules that are scaled as closely as possible to ignition capsules ͑hydrodynamic equivalence͒. The HEP program also addresses other capsule physics issues associated with ignition, such as energy gain and energy loss to the fuel during implosion in the absence of alpha-particle deposition. The results from the Nova and Omega experiments approach the NIF requirements for most of the important ignition capsule parameters, including drive temperature, drive symmetry, and hydrodynamic instability. This paper starts with a review of the NIF target designs that have formed the motivation for the goals of the target physics program. Following that are theoretical and experimental results from Nova and Omega relevant to the requirements of those targets. Some elements of this work were covered in a 1995 review of indirect-drive ͓J. D. Lindl, ''Development of the indirect-drive approach to inertial confinement fusion and the target physics basis for ignition and gain,'' Phys. Plasmas 2, 3933 ͑1995͔͒. In order to present as complete a picture as possible of the research that has been carried out on indirect drive, key elements of that earlier review are also covered here, along with a review of work carried out since 1995.

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Section: Toroidal Hohlraumsmentioning

confidence: 99%

Section: Toroidal Hohlraumsmentioning

confidence: 99%