Article
Optics
Zou Lu, Geng Yuanchao, Liu Guodong, Liu Lanqin, Chen Fengdong, Liu Bingguo, Hu Dongxia, Zhou Wei, Peng Zhitao
Summary: A novel method based on ensemble deep neural networks is proposed to accurately predict the laser output energy of an inertial confinement fusion (ICF) facility. The method considers more related factors and achieves robust and stable predictions using ensemble techniques.
Review
Automation & Control Systems
Leonardo Riva, Paola Serena Ginestra, Elisabetta Ceretti
Summary: The increasing demand for wider access to additive manufacturing technologies is driving the production of metal lattice structures with powder bed fusion techniques, especially laser-based powder bed fusion. Lattice structures are suitable for applications in aerospace, automotive, and biomedicine due to their tailored porosity, low weight, and tunable mechanical properties. Despite extensive studies on their physical and mechanical properties in recent years, there is still a lack of specific standards for their characterization.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Mengqiu Fan, Shengtao Lin, Ke Yao, Yifei Qi, Jiaojiao Zhang, Junwen Zheng, Pan Wang, Longqun Ni, Xingyu Bao, Dandan Zhou, Bo Zhang, Kaibo Xiao, Handing Xia, Rui Zhang, Ping Li, Wanguo Zheng, Zinan Wang
Summary: In this study, a random fiber laser (RFL) is proposed as the seed source, and through precise pulse shaping and efficient regenerative amplification, a low-coherence and efficient spectrum-conformal output of random laser pulse is achieved.
MATTER AND RADIATION AT EXTREMES
(2023)
Article
Physics, Fluids & Plasmas
Hui Cao, Xufei Xie, Yaohua Chen, Yunsong Dong, Liquan Wang, Zhurong Cao, Xu Chen, Qiangqiang Wang, Wei Zhou, Wei Zhang, Zhichao Li, Sanwei Li, Bo Deng, Liang Hao, Shu Li, Junfeng Wu, Guoli Ren, Xudeng Hang, Wenyi Huo, Xiaoxia Huang, Xiaoshi Peng, Dong Yang, Tao Xu, Lifei Hou, Xingsen Che, Liang Guo, Huabing Du, Xiaoan He, Chaoguang Li, Pin Yang, Qianqian Gu, Yuancheng Wang, Kuixing Zheng, Yunbao Huang, Bin Feng, Guanghui Yuan, Baibin Jiang, Haijun Zhang, Feng Wang, Jiamin Yang, Shenye Liu, Jun Xie, Zhibing He, Kai Du, Jie Liu, Shiyang Zou, Yongkun Ding, Qihua Zhu, Ke Lan
Summary: The novel octahedral spherical hohlraum is a promising approach for the next generation of laser systems to achieve predictable and reproducible fusion gain. Repointing the laser beams at a cylindrically configured laser facility can approach the ideal octahedral beam configuration. The investigation and experiment at the SGIII facility showed the feasibility of the 32-beam optimum repointing scheme and demonstrated the generation of high energy inside an octahedral hohlraum.
PHYSICS OF PLASMAS
(2023)
Article
Nuclear Science & Technology
T. R. Barrett, M. Bamford, B. Chuilon, T. Deighan, P. Efthymiou, L. Fletcher, M. Gorley, T. Grant, T. Hall, D. Horsley, M. Kovari, M. Tindall
Summary: The CHIMERA fusion technology facility allows testing of large in-vessel component modules under reactor-like thermal power density and magnetic field conditions. It is equipped with a large superconducting magnet and a PWR-like water loop, making it suitable for experiments on liquid metal breeding blankets. Construction of the facility is underway and accompanied by a parallel research and development program. A bespoke infrared heating system has been developed, capable of delivering 0.5 MW/m2 of energy to component surfaces.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Optics
G. Cristoforetti, P. Koester, S. Atzeni, D. Batani, S. Fujioka, Y. Hironaka, S. Huller, T. Idesaka, K. Katagiri, K. Kawasaki, R. Kodama, D. Mancelli, Ph. Nicolai, N. Ozaki, A. Schiavi, K. Shigemori, R. Takizawa, T. Tamagawa, D. Tanaka, A. Tentori, Y. Umeda, A. Yogo, L. A. Gizzi
Summary: The interaction between laser and plasma as well as the generation of hot electrons were studied in an experiment relevant to direct-drive inertial confinement fusion. High-energy electrons with temperatures of 20-50 keV were mainly produced by the damping of electron plasma waves driven by two-plasmon decay (TPD). Stimulated Raman scattering (SRS) was observed in a near-threshold growth regime and described by an analytical model, indicating a more vigorous growth driven by multiple beams compared to single-beam laser intensity.
HIGH POWER LASER SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Ji Yan, Jiwei Li, X. T. He, Lifeng Wang, Yaohua Chen, Feng Wang, Xiaoying Han, Kaiqiang Pan, Juxi Liang, Yulong Li, Zanyang Guan, Xiangming Liu, Xingsen Che, Zhongjing Chen, Xing Zhang, Yan Xu, Bin Li, Minqing He, Hongbo Cai, Liang Hao, Zhanjun Liu, Chunyang Zheng, Zhensheng Dai, Zhengfeng Fan, Bin Qiao, Fuquan Li, Shaoen Jiang, M. Y. Yu, Shaoping Zhu
Summary: The authors report a proposed hybrid-drive scheme in which stable implosion and nonstagnation ignition are achieved through the use of hemispherical and planar ablator targets installed in a semicylindrical hohlraum. The experiments demonstrate significant pressure smoothing and the suppression of asymmetric shockwaves by symmetric strong shockwaves, as well as backscattering and hot-electron energy fractions one-third of that in the direct-drive scheme.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Manufacturing
H. C. Taylor, E. A. Garibay, R. B. Wicker
Summary: A test artifact has been designed to evaluate various performance indicators of LPBF systems, including geometric feature accuracy, residual stress, and chemical composition, to support optimization, qualification, and wider application of LPBF.
ADDITIVE MANUFACTURING
(2021)
Article
Physics, Fluids & Plasmas
Mauro Temporal, Benoit Canaud, Rafael Ramis
Summary: This study aims to analyze the potential of directly driven imploding spherical targets for generating energetic particles, considering different absorbed laser intensities and ablated glass layer amounts. Two distinct regimes, a massive pusher and an exploding pusher, have been identified based on the absorbed laser intensity and ablated glass layer. Energetic particle time-resolved spectra were calculated to infer ionic temperatures and total areal densities, with a parametric study varying the shell thickness and target inner radius for both laser absorbed intensities.
JOURNAL OF PLASMA PHYSICS
(2021)
Article
Optics
D. Thul, R. Bernath, N. Bodnar, H. Kerrigan, D. Reyes, J. Pena, P. Roumayah, L. Shah, D. Maukonen, J. Bradford, M. Baudelet, S. Rostami Fairchild, M. Richardson
Summary: The Mobile Ultrafast High Energy Laser Facility is a compact and transportable 5 TW near-infrared laser source located at Kennedy Space Center, suitable for long range studies of high intensity laser propagation. With stand-alone beam diagnostic stations and atmospheric monitoring capabilities, this facility is ideal for the development of stand-off high energy ultrafast applications and atmospheric laser science studies.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Physics, Fluids & Plasmas
A. B. Zylstra, A. L. Kritcher, O. A. Hurricane, D. A. Callahan, J. E. Ralph, D. T. Casey, A. Pak, O. L. Landen, B. Bachmann, K. L. Baker, L. Berzak Hopkins, S. D. Bhandarkar, J. Biener, R. M. Bionta, N. W. Birge, T. Braun, T. M. Briggs, P. M. Celliers, H. Chen, C. Choate, D. S. Clark, L. Divol, T. Doppner, D. Fittinghoff, M. J. Edwards, M. Gatu Johnson, N. Gharibyan, S. Haan, K. D. Hahn, E. Hartouni, D. E. Hinkel, D. D. Ho, M. Hohenberger, J. P. Holder, H. Huang, N. Izumi, J. Jeet, O. Jones, S. M. Kerr, S. F. Khan, H. Geppert Kleinrath, V. Geppert Kleinrath, C. Kong, K. M. Lamb, S. Le Pape, N. C. Lemos, J. D. Lindl, B. J. MacGowan, A. J. Mackinnon, A. G. MacPhee, E. Marley, K. Meaney, M. Millot, A. S. Moore, K. Newman, J-M G. Di Nicola, A. Nikroo, R. Nora, P. K. Patel, N. G. Rice, M. S. Rubery, J. Sater, D. J. Schlossberg, S. M. Sepke, K. Sequoia, S. J. Shin, M. Stadermann, S. Stoupin, D. J. Strozzi, C. A. Thomas, R. Tommasini, C. Trosseille, E. R. Tubman, P. L. Volegov, C. R. Weber, C. Wild, D. T. Woods, S. T. Yang, C. Young
Summary: On August 8, 2021, an inertial fusion implosion on the National Ignition Facility achieved a fusion yield of over a megajoule and met Lawson's criterion for ignition. Experimental measurements show significant improvements in burn rate and hot-spot conditions, reaching unprecedented levels in inertial fusion research.
Article
Physics, Multidisciplinary
Jing Xie, Li Wang, Chong Liu, Yan-Li Zhang, Qiang Liu, Tao Wang, Zhi-Hao Chai, Zhi-Qiang Xia, Lin Yang, Pan-Zheng Zhang, Bao-Qiang Zhu
Summary: The SGII-UP laser facility in China, as one of the most important high power laser systems, has been improved to meet higher physical requirements by increasing the number of neodymium glasses and improving the energy configuration. The improvement shows significant increase in output and modulation suppression.
ACTA PHYSICA SINICA
(2023)
Article
Multidisciplinary Sciences
M. Temporal, A. R. Piriz, B. Canaud, R. Ramis, R. S. Craxton
Summary: This study proposes an improved laser beam configuration and utilizes zooming technique to enhance the laser-target coupling efficiency. The simulations show that this approach can achieve an optimistic one-dimensional thermonuclear energy gain greater than one.
SCIENTIFIC REPORTS
(2023)
Review
Materials Science, Multidisciplinary
Nana Kwabena Adomako, Nima Haghdadi, Sophie Primig
Summary: The application of additive manufacturing (AM) for Ni-based superalloys is important in aerospace and power-generation industries. However, challenges arise due to heterogeneity in printing complex alloys. Understanding the relationship between AM process and microstructure heterogeneity is crucial for developing mitigation strategies. Fabricating more homogeneous Ni-based superalloy parts is expected to enhance mechanical properties and expand applications.
MATERIALS & DESIGN
(2022)
Article
Physics, Fluids & Plasmas
Chuanying Li, Fengjun Ge, Changshu Wu, Jianfa Gu, Zhongjing Chen, Zhensheng Dai, Xin Li, Tianxuan Huang, Bolun Chen, Bo Deng, Keli Deng, Wudi Zheng, Shiyang Zou
Summary: Achieving ignition requires understanding and controlling time-dependent implosion asymmetry. A recent experiment demonstrated effective time-dependent symmetry control by modifying the ratio of inner beam power to outer beam power. Analysis of hohlraum radiation and P2 drive asymmetry illustrated the sensitivity of P2 shell asymmetry to drive asymmetry.
PHYSICS OF PLASMAS
(2021)
Article
Nuclear Science & Technology
S. P. Regan, V. N. Goncharov, T. C. Sangster, E. M. Campbell, R. Betti, K. S. Anderson, T. Bernat, A. Bose, T. R. Boehly, M. J. Bonino, D. Cao, R. Chapman, T. J. B. Collins, R. S. Craxton, A. K. Davis, J. A. Delettrez, D. H. Edgell, R. Epstein, M. Farrell, C. J. Forrest, J. A. Frenje, D. H. Froula, M. Gatu Johnson, C. Gibson, V. Yu. Glebov, A. Greenwood, D. R. Harding, M. Hohenberger, S. X. Hu, H. Huang, J. Hund, I. V. Igumenshchev, D. W. Jacobs-Perkins, R. T. Janezic, M. Karasik, R. L. Keck, J. H. Kelly, T. J. Kessler, J. P. Knauer, T. Z. Kosc, S. J. Loucks, J. A. Marozas, F. J. Marshall, R. L. McCrory, P. W. McKenty, D. D. Meyerhofer, D. T. Michel, J. F. Myatt, S. P. Obenschain, R. D. Petrasso, N. Petta, P. B. Radha, M. J. Rosenberg, A. J. Schmitt, M. J. Schmitt, M. Schoff, W. Seka, W. T. Shmayda, M. J. Shoup, A. Shvydky, A. A. Solodov, C. Stoeckl, W. Sweet, C. Taylor, R. Taylor, W. Theobald, J. Ulreich, M. D. Wittman, K. M. Woo, J. D. Zuegel
FUSION SCIENCE AND TECHNOLOGY
(2018)
Article
Physics, Fluids & Plasmas
Wallace Manheimer, Denis Colombant, Andrew Schmitt
PHYSICS OF PLASMAS
(2018)
Article
Physics, Fluids & Plasmas
Wallace Manheimer, Denis Colombant, Andrew Schmitt
PHYSICS OF PLASMAS
(2018)
Article
Physics, Fluids & Plasmas
S. P. Regan, V. N. Goncharov, T. C. Sangster, E. M. Campbell, R. Betti, J. W. Bates, K. Bauer, T. Bernat, S. Bhandarkar, T. R. Boehly, M. J. Bonino, A. Bose, D. Cao, L. Carlson, R. Chapman, T. Chapman, G. W. Collins, T. J. B. Collins, R. S. Craxton, J. A. Delettrez, D. H. Edgell, R. Epstein, M. Farrell, C. J. Forrest, R. K. Follett, J. A. Frenje, D. H. Froula, M. Gatu Johnson, C. R. Gibson, L. Gonzalez, C. Goyon, V. Yu Glebov, V. Gopalaswamy, A. Greenwood, D. R. Harding, M. Hohenberger, S. X. Hu, H. Huang, J. Hund, I. V. Igumenshchev, D. W. Jacobs-Perkins, R. T. Janezic, M. Karasik, J. H. Kelly, T. J. Kessler, J. P. Knauer, T. Z. Kosc, R. Luo, S. J. Loucks, J. A. Marozas, F. J. Marshall, M. Mauldin, R. L. McCrory, P. W. Mckenty, D. T. Michel, P. Michel, J. D. Moody, J. F. Myatt, A. Nikroo, P. M. Nilson, S. P. Obenschain, J. P. Palastro, J. Peebles, R. D. Petrasso, N. Petta, P. B. Radha, J. E. Ralph, M. J. Rosenberg, S. Sampat, A. J. Schmitt, M. J. Schmitt, M. Schoff, W. Seka, R. Shah, J. R. Rygg, J. G. Shaw, R. Short, W. T. Shmayda, M. J. Shoup, A. Shvydky, A. A. Solodov, C. Sorce, M. Stadermann, C. Stoeckl, W. Sweet, C. Taylor, R. Taylor, D. P. Turnbull, J. Ulreich, M. D. Wittman, K. M. Woo, K. Youngblood, J. D. Zuegel
Article
Physics, Multidisciplinary
I. Igumenshchev, A. L. Velikovich, V. N. Goncharov, R. Betti, E. M. Campbell, J. P. Knauer, S. P. Regan, A. J. Schmitt, R. C. Shah, A. Shvydky
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
C. Zulick, Y. Aglitskiy, M. Karasik, A. J. Schmitt, A. L. Velikovich, S. P. Obenschain
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Fluids & Plasmas
C. Zulick, Y. Aglitskiy, M. Karasik, A. J. Schmitt, A. L. Velikovich, S. P. Obenschain
PHYSICS OF PLASMAS
(2020)
Article
Physics, Fluids & Plasmas
M. F. Wolford, M. C. Myers, Tz B. Petrova, J. L. Giuliani, T. J. Kessler, M. W. McGeoch, G. M. Petrov, A. J. Schmitt, T. A. Mehlhorn, S. P. Obenschain
HIGH ENERGY DENSITY PHYSICS
(2020)
Article
Physics, Fluids & Plasmas
T. -G. Lee, W. Jarrah, D. Benredjem, J. -C. Pain, M. Busquet, M. Klapisch, A. J. Schmitt, J. W. Bates, J. Giuliani
HIGH ENERGY DENSITY PHYSICS
(2020)
Article
Multidisciplinary Sciences
S. P. Obenschain, A. J. Schmitt, J. W. Bates, M. F. Wolford, M. C. Myers, M. W. McGeoch, M. Karasik, J. L. Weaver
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2020)
Article
Physics, Fluids & Plasmas
A. L. Velikovich, A. J. Schmitt, C. Zulick, Y. Aglitskiy, M. Karasik, S. P. Obenschain, J. G. Wouchuk, F. Cobos Campos
PHYSICS OF PLASMAS
(2020)
Article
Physics, Fluids & Plasmas
Jaechul Oh, Andrew J. Schmitt, Max Karasik, Stephen P. Obenschain
Summary: The direct-drive laser imprint experiments conducted on the Nike krypton fluoride laser facility demonstrated that increasing the number of overlapping laser beams can reduce shock velocity perturbations, as expected by the beam averaging effect. Additionally, experiments on high-Z coated targets showed a further reduction in shock velocity perturbations compared to uncoated targets, providing valuable quantitative data for calibrating radiation-hydrodynamic simulations of laser imprint.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Fluids & Plasmas
Max Karasik, Jaechul Oh, S. P. Obenschain, A. J. Schmitt, Y. Aglitskiy, C. Stoeckl
Summary: The study shows that pre-expansion of the high-Z coating before use can effectively reduce laser imprint. Results from experiments using a frequency tripled Nd: glass laser system demonstrate reduction in imprint, but require an externally generated low level soft x-ray prepulse. Additionally, the highest imprint reduction is observed with Pd and Au coatings of at least 400 angstrom thickness.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Fluids & Plasmas
Y. Aglitskiy, C. Zulick, J. Oh, A. L. Velikovich, A. J. Schmitt, S. P. Obenschain, M. Karasik, J. L. Weaver
HIGH ENERGY DENSITY PHYSICS
(2020)
Article
Physics, Fluids & Plasmas
T. -G. Lee, M. Busquet, M. Klapisch, J. W. Bates, A. J. Schmitt, S. X. Hu, J. Giuliani