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Recent and planned hydrodynamic instability experiments on indirect-drive implosions on the National Ignition Facility
High Energy Density Physics ( IF 1.6 ) Pub Date : 2020-05-07 , DOI: 10.1016/j.hedp.2020.100820
V.A. Smalyuk , C.R. Weber , O.L. Landen , S. Ali , B. Bachmann , P.M. Celliers , E. Dewald , A. Fernandez , B.A. Hammel , G. Hall , A.G. MacPhee , L. Pickworth , H.F. Robey , N. Alfonso , K.L. Baker , L.F. Berzak Hopkins , L. Carlson , D.T. Casey , D.S. Clark , J. Crippen , L. Divol , T. Döppner , J. Edwards , M. Farrell , S. Felker , J.E. Field , S.W. Haan , A.V. Hamza , M. Havre , M.C. Herrmann , W.W. Hsing , S. Khan , J. Kline , J.J. Kroll , S. LePape , E. Loomis , B.J. MacGowan , D. Martinez , L. Masse , M. Mauldin , J.L. Milovich , A.S. Moore , A. Nikroo , A. Pak , P.K. Patel , J.L. Peterson , K. Raman , B.A. Remington , N. Rice , M. Schoff , M. Stadermann , S.A. Yi

At National Ignition Facility (NIF), yield amplification due to alpha particle heating approached ~3 in the highest performing inertial confinement fusion (ICF) implosions, while yield amplification of ~15-30 is needed for ignition. Hydrodynamic instabilities are a major factor in degradation of implosions while understanding and mitigation of the instabilities are critical to achieving ignition. This article describes recent and planned hydrodynamic instability experiments with several focused platforms that have been developed to directly measure these instabilities in all phases of ICF implosions. Measurements of ripple-shock generation at OMEGA laser have indicated initial seeds for the instabilities in three ablators - plastic (CH), beryllium, and high-density carbon (HDC). Hydrodynamic Growth Radiography (HGR) platform was used to measure instability growth at the ablation front in the acceleration phase of implosions. This platform used pre-imposed 2-D perturbations for growth factor measurements at different perturbation wavelengths and was also used to measure growth of “native roughness” modulations, fill tubes, and capsule support membranes or “tents”. Also, in the acceleration phase several new experimental platforms have been or are being developed to measure instability growth at the ablator-ice interface. In the deceleration phase of implosions, “self-emission” and “self-backlighting” platforms were developed to measure perturbations near peak compression. This article reviews recent progress and results.



中文翻译:

国家点火装置间接驱动内爆的最新和计划的水动力不稳定性实验

在国家点火设施(NIF),在最高性能的惯性约束聚变(ICF)内爆中,由于α粒子加热导致的收率放大接近3,而点火所需的收率放大约为15-30。流体力学的不稳定性是导致内爆性降低的主要因素,而对不稳定性的理解和缓解对实现点火至关重要。本文介绍了最近和计划中的具有几个重点平台的水动力不稳定性实验,这些重点平台已经开发出来,可以直接测量ICF内爆所有阶段的不稳定性。在OMEGA激光器上测量波纹激波的现象已表明,最初的种子是三种烧蚀器(塑料(CH),铍和高密度碳(HDC))不稳定的原因。使用流体动力学生长成像(HGR)平台来测量内爆加速阶段消融前沿的不稳定性增长。该平台使用预先设置的二维扰动在不同扰动波长下测量生长因子,还用于测量“自然粗糙度”调制,填充管和胶囊支撑膜或“帐篷”的生长。同样,在加速阶段,已经或正在开发一些新的实验平台来测量消融冰界面的不稳定性增长。在内爆的减速阶段,开发了“自发射”和“自背光”平台来测量峰值压缩附近的扰动。本文回顾了最新进展和结果。该平台使用预先设置的二维扰动在不同扰动波长下测量生长因子,还用于测量“自然粗糙度”调制,填充管和胶囊支撑膜或“帐篷”的生长。同样,在加速阶段,已经或正在开发一些新的实验平台来测量消融冰界面的不稳定性增长。在内爆的减速阶段,开发了“自发射”和“自背光”平台来测量峰值压缩附近的扰动。本文回顾了最新进展和结果。该平台使用预先设置的二维扰动在不同扰动波长下测量生长因子,还用于测量“自然粗糙度”调制,填充管和胶囊支撑膜或“帐篷”的生长。同样,在加速阶段,已经或正在开发一些新的实验平台,以测量消融冰界面的不稳定性增长。在内爆的减速阶段,开发了“自发射”和“自背光”平台来测量峰值压缩附近的扰动。本文回顾了最近的进展和结果。在加速阶段,已经或正在开发一些新的实验平台来测量消融冰界面的不稳定性增长。在内爆的减速阶段,开发了“自发射”和“自背光”平台来测量峰值压缩附近的扰动。本文回顾了最新进展和结果。在加速阶段,已经或正在开发一些新的实验平台来测量消融冰界面的不稳定性增长。在内爆的减速阶段,开发了“自发射”和“自背光”平台来测量峰值压缩附近的扰动。本文回顾了最新进展和结果。

更新日期:2020-05-07
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