Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility
Hydrodynamic instability growth of three-dimensional modulations in radiation-driven implosions with “low-foot” and “high-foot” drives at the National Ignition Facility
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国家点火装置中“低脚”和“高脚”驱动的辐射驱动内爆中三维调制的流体动力学不稳定性增长
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发表时间：
2017
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通讯作者：
N. Rice
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作者：
V. Smalyuk;C. Weber;H. Robey;D. Casey;K. C. Chen;D. Clark;M. Farrell;S. Felker;J. Field;S. Haan;B. Hammel;A. Hamza;D. Hoover;J. Kroll;O. Landen;A. MacPhee;D. Martinez;A. Nikroo;N. Rice
在美国国家点火装置（NIF）上，利用三维宽带调制方法，通过比较高足和低足球形塑料（CH）胶囊内爆，研究了流体动力学不稳定性增长[E. M.坎贝尔等人，AIP Conf.Proc.429，3（1998）]。最初的扰动包括胶囊外表面粗糙度和胶囊安装膜（“帐篷”），这些膜与NIF上大多数内爆中使用的膜相似。在实验中使用具有31-nm、46-nm和109-nm厚度的帐篷。在“低脚”实验中的外表面粗糙度与标准规格相似，而在“高脚”实验中，外表面粗糙度增加了1.24倍，以补偿减少的生长。消融前沿不稳定性增长是使用流体动力学增长射线照相平台在收敛比为0.03时测量的。由帐篷安装产生的占主导地位的胶囊扰动，测得的扰动幅度与胶囊厚度相当，……
Hydrodynamic instability growth has been studied using three-dimensional (3-D) broadband modulations by comparing “high-foot” and “low-foot” spherical plastic (CH) capsule implosions at the National Ignition Facility (NIF) [E. M. Campbell et al., AIP Conf. Proc. 429, 3 (1998)]. The initial perturbations included capsule outer-surface roughness and capsule-mounting membranes (“tents”) that were similar to those used in a majority of implosions on NIF. The tents with thicknesses of 31-nm, 46-nm, and 109-nm were used in the experiments. The outer-surface roughness in the “low-foot” experiment was similar to the standard specification, while it was increased by ∼4 times in the “high-foot” experiment to compensate for the reduced growth. The ablation-front instability growth was measured using a Hydrodynamic Growth Radiography platform at a convergence ratio of ∼3. The dominant capsule perturbations, generated by the tent mountings, had measured perturbation amplitudes comparable to the capsule thickness with ...