Frustraum 1100 experimental campaign on the national ignition facility

IF 1.6 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS High Energy Density Physics Pub Date : 2024-09-16 DOI:10.1016/j.hedp.2024.101158

K.L. Baker , P.A. Amendt , D.A. Mariscal , H. Sio , O.L. Landen , D.D. Ho , V.A. Smalyuk , J.D. Lindl , J.S. Ross , L. Aghaian , A. Allen , N. Aybar , N.W. Birge , D.T. Casey , P.M. Celliers , H. Chen , T. Fehrenbach , D. Fittinghoff , H. Geppert-Kleinrath , V. Geppert-Kleinrath , C.V. Young

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Abstract

We present findings from an experimental tuning campaign aimed at igniting larger DT cryogenic layered implosions using a dual frustum shaped hohlraum, denoted “frustraum”. The frustraum's distinctive shape reduces hohlraum wall losses while concurrently enhancing minimum capsule clearance with the hohlraum wall and sensitivity to pointing changes. Compared to current cylindrical hohlraum (6.4 × 11.24 mm), the frustraum has a wall area approximately 20 % smaller, resulting in a measured improvement in efficiency of around 12 %. Consequently, 12 % less laser energy is required to implode a capsule within the same acceleration timeframe. Conversely, directing the same laser energy into the frustraum yields higher ion temperatures within symmetry capsules, along with increased radiation temperatures and reduced implosion acceleration times compared to current cylindrical hohlraums.

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Frustraum 1100 国家点火装置实验活动

我们介绍了一项实验调整活动的研究结果，该活动旨在使用双 "穹隆"（即 "穹隆"）形状的穹隆点燃较大的 DT 低温分层内爆。穹隆的独特形状降低了穹隆壁的损耗，同时增强了囊体与穹隆壁的最小间隙以及对指向变化的灵敏度。与目前的圆柱形光室（6.4 × 11.24 毫米）相比，frustraum 的光室壁面积小了约 20%，效率提高了约 12%。因此，在相同的加速时间内，内爆一个太空舱所需的激光能量减少了 12%。相反，与目前的圆柱形内爆腔相比，将相同的激光能量射入内爆腔可提高对称胶囊内的离子温度，同时提高辐射温度并缩短内爆加速时间。

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来源期刊

High Energy Density Physics PHYSICS, FLUIDS & PLASMAS-

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings. Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.