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Two-photon polymerization printed lattices as support structures in multi-shell ICF targets: Platform development and initial assessment
Physics of Plasmas ( IF 2.2 ) Pub Date : 2020-12-01 , DOI: 10.1063/5.0027820 Brett Scheiner 1 , Mark J. Schmitt 1 , Derek Schmidt 1 , Lynne Goodwin 1 , Frederic J. Marshall 2
Physics of Plasmas ( IF 2.2 ) Pub Date : 2020-12-01 , DOI: 10.1063/5.0027820 Brett Scheiner 1 , Mark J. Schmitt 1 , Derek Schmidt 1 , Lynne Goodwin 1 , Frederic J. Marshall 2
Affiliation
Recent interest in fielding direct drive multi-shell targets on the NIF [K. Molvig et al., Phys. Rev. Lett. 116, 255003 (2016) and S. X. Hu et al., Phys. Rev. E 100, 063204 (2019)] has highlighted the need for a low density structure to support the inner shell(s) and to avoid energy loss in the acceleration and collision process. We have developed a two-shell platform to evaluate the use of low density two-photon polymerization (2PP) printed lattices as a support structure between the shells. 2PP structures are an attractive option because they can be produced at densities as low as 5 mg/cc, which is ideal for multi-shell targets, and their 3D structure can be tailored to the user's needs. However, idealized 1D simulations of lattice strut surrogate thin shells indicate that the lattice will only isotropize before the shells collide if the strut thickness is sufficiently fine. This platform makes use of high resolution Fresnel zone plate images to evaluate the uniformity of the post-collision inner shell and provide information on how efficiently the lattice structure isotropizes. As a proof of principle, an initial experiment contrasts the case of 5 μm lattice struts that cause significant disfiguration of the inner shell with the uniform post-collision inner shell in the absence of this material. Finer lattice structures on future experiments will evaluate post-collision inner shell uniformity. This new platform and accompanying diagnostic technique can also be used to evaluate both asymmetry in capsule drive and target non-uniformities with resolution up to mode 40.
中文翻译:
双光子聚合印刷晶格作为多壳 ICF 目标中的支撑结构:平台开发和初步评估
最近对在 NIF 上部署直接驱动多壳目标的兴趣 [K. Molvig 等人,物理学。牧师莱特。116, 255003 (2016) 和 SX Hu 等人,Phys. Rev. E 100, 063204 (2019)] 强调需要低密度结构来支撑内壳并避免加速和碰撞过程中的能量损失。我们开发了一个双壳平台来评估使用低密度双光子聚合 (2PP) 印刷晶格作为壳之间的支撑结构。2PP 结构是一个有吸引力的选择,因为它们可以以低至 5 mg/cc 的密度生产,这是多壳目标的理想选择,并且它们的 3D 结构可以根据用户的需求进行定制。然而,晶格支柱替代薄壳的理想化 1D 模拟表明,如果支柱厚度足够细,则晶格只会在壳碰撞之前各向同性。该平台利用高分辨率菲涅耳波带板图像来评估碰撞后内壳的均匀性,并提供有关晶格结构各向同性化效率的信息。作为原理证明,初始实验将导致内壳显着变形的 5 μm 晶格支柱的情况与在没有这种材料的情况下均匀的碰撞后内壳进行对比。未来实验中更精细的晶格结构将评估碰撞后的内壳均匀性。
更新日期:2020-12-01
中文翻译:
双光子聚合印刷晶格作为多壳 ICF 目标中的支撑结构:平台开发和初步评估
最近对在 NIF 上部署直接驱动多壳目标的兴趣 [K. Molvig 等人,物理学。牧师莱特。116, 255003 (2016) 和 SX Hu 等人,Phys. Rev. E 100, 063204 (2019)] 强调需要低密度结构来支撑内壳并避免加速和碰撞过程中的能量损失。我们开发了一个双壳平台来评估使用低密度双光子聚合 (2PP) 印刷晶格作为壳之间的支撑结构。2PP 结构是一个有吸引力的选择,因为它们可以以低至 5 mg/cc 的密度生产,这是多壳目标的理想选择,并且它们的 3D 结构可以根据用户的需求进行定制。然而,晶格支柱替代薄壳的理想化 1D 模拟表明,如果支柱厚度足够细,则晶格只会在壳碰撞之前各向同性。该平台利用高分辨率菲涅耳波带板图像来评估碰撞后内壳的均匀性,并提供有关晶格结构各向同性化效率的信息。作为原理证明,初始实验将导致内壳显着变形的 5 μm 晶格支柱的情况与在没有这种材料的情况下均匀的碰撞后内壳进行对比。未来实验中更精细的晶格结构将评估碰撞后的内壳均匀性。