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Late-time simulation of National Ignition Facility hohlraums

D.C. Eder, A.E. Koniges, O.S. Jones, M.M. Marinak, M.T. Tobin, B.J. MacGowan2004年被引用 7Nuclear FusionIF 3出版社

The late-time (t ≥ 80 ns) behaviour of hohlraums designed for the National Ignition Facility (NIF) is simulated using the multiphysics radiation hydrodynamics codes LASNEX and HYDRA. The spatial distribution of x-radiation outside the hohlraum is shown as a function of time. The energy spectrum of the x-ray emission is presented for various hohlraum viewing angles. We have made refinements to the grid motion algorithms in the arbitrary Lagrangian Eulerian (ALE) hydrodynamics code HYDRA to obtain the first late-time simulations of a hohlraum that can be used to give the spatial distribution of the vaporized hohlraum wall. The importance of late-time simulations in determining the lifetimes of debris shields on NIF is discussed.

日本語訳

NIF(国立点火施設)用に設計されたホーラムの後期(t ≥ 80 ns)挙動を、多物理放射流体力学コードLASNEXおよびHYDRAを用いてシミュレーションする。ホーラム外部のX線放射の空間分布を時間の関数として示す。X線放射のエネルギースペクトルを、様々なホーラム観測角度について提示する。我々は、任意ラグランジュ・オイラー(ALE)流体力学コードHYDRAにおけるグリッド移動アルゴリズムを改良し、蒸発したホーラム壁の空間分布を与えることができるホーラムの初の後期シミュレーションを実現した。NIFにおけるデブリシールドの寿命を決定する上での後期シミュレーションの重要性について議論する。

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