• Special Issue
  • Target Fabrication
  • 19 Article (s)
Development of target fabrication for laser-driven inertial confinement fusion at research center of laser fusion
Tao Wang, Kai Du , Zhibing He, and Xiaoshan He
High Power Laser Science and Engineering
  • Publication Date: Mar. 01, 2017
  • Vol.5 Issue, 1 010000e5 (2017)
Permeation fill-tube design for inertial confinement fusion target capsules
B.S. Rice, J. Ulreich, C. Fella, J. Crippen, P. Fitzsimmons, and A. Nikroo
High Power Laser Science and Engineering
  • Publication Date: Mar. 22, 2017
  • Vol.5 Issue, 1 010000e6 (2017)
Fluid sample injectors for x-ray free electron laser at SACLA
Kensuke Tono
This paper provides a review on sample injectors which are provided at SPring-8 Angstrom Compact free electron LAser (SACLA) for conducting serial measurement in a ‘diffract-before-destroy’ scheme using an x-ray free electron laser (XFEL). Versatile experimental platforms at SACLA are able to accept various types of injectors, among which liquid-jet, droplet and viscous carrier injectors are frequently utilized. These injectors produce different forms of fluid targets such as a liquid filament with a diameter in the order of micrometer, micro-droplet synchronized to XFEL pulses, and slowly flowing column of highly viscous fluid with a rate below $1~\unicode[STIX]{x03BC}\text{L}~\text{min}^{-1}$. Characteristics and applications of the injectors are described.
High Power Laser Science and Engineering
  • Publication Date: Apr. 07, 2017
  • Vol.5 Issue, 2 020000e7 (2017)
Efficient offline production of freestanding thin plastic foils for laser-driven ion sources
Sebastian Seuferling, Matthias Alexander Otto Haug, Peter Hilz, Daniel Haffa, Christian Kreuzer, and Jörg Schreiber
Modern chirped pulse amplification laser systems with continuously improving controllability and increasing power are about to reach intensities of up to $10^{22}~\text{W}~\text{cm}^{-2}$ and have proven their potential to accelerate ions out of plasma to several tens percent of the speed of light. For enabling application, one important step is to increase the repetition rate at which ion bunches are at the disposal. In particular, techniques used so far for thin foil target production can require several days of preparing reasonable amounts for a single campaign. In this paper we describe the reasonably droplet method which we have tested and improved so that the emerging foils with thicknesses of a few nanometres up to micrometre can be used as targets for laser ion acceleration. Their quality and performance can compete with so far employed techniques thereby enabling the production of hundreds of targets per day.
High Power Laser Science and Engineering
  • Publication Date: Apr. 03, 2017
  • Vol.5 Issue, 2 020000e8 (2017)
A new spatial angle assembly method of the ICF target
Wenrong Wu, Lie Bi, Kai Du, Juan Zhang, Honggang Yang, and Honglian Wang
The designs of inertial confinement fusion (ICF) targets, which field on ShenGuang III, are becoming more complex and more stringent in terms of assembly precision. A key specification of these targets is the spatial angle alignment accuracy. To meet these needs, we present a new spatial angle assembly method, using target part’s 3D model-based dual orthogonal camera vision, which is better suited for the flexible automation of target assembly processes. The two-hands structure micromanipulate system and dual orthogonal structure visual feedback system were investigated by considering the kinematics, spatial angle measuring, and motion control in an integrated way. In this paper, we discuss the measurement accuracy of spatial angle assembly method, which compared the real-time image acquisition with the redrawing 2D projection. The result shows that the assembly method proposed is very effective and meets the requirements of angle assembly accuracy, which is less than $1^{\circ }$. Also, this work is expected to contribute greatly to the advancement of other target microassembly equipments.
High Power Laser Science and Engineering
  • Publication Date: May. 03, 2017
  • Vol.5 Issue, 2 020000e9 (2017)
An investigation progress toward Be-based ablator materials for the inertial confinement fusion
Bingchi Luo, Jiqiang Zhang, Yudan He, Long Chen, Jiangshan Luo, Kai Li, and Weidong Wu
The Be-based materials with many particular properties lead to an important research subject. The investigation progresses in the fabrication technologies are introduced here, including main three kinds of Be-based materials, such as Be–Cu capsule, $\text{Be}_{2}\text{C}$ ablator and high-purity Be material. Compared with the pioneer workgroup on Be-based materials, the differences in Be–Cu target fabrication were described, and a grain refinement technique by an active hydrogen reaction for Be coating was proposed uniquely. $\text{Be}_{2}\text{C}$ coatings were first prepared by the DC reactive magnetron sputtering with a high deposition rate $({\sim}300~\text{nm}/\text{h})$. Pure polycrystalline $\text{Be}_{2}\text{C}$ films with uniform microstructures, smooth surface, high density $({\sim}2.2~\text{g}\cdot \text{cm}^{3})$ and good optical transparency were fabricated. In addition, the high-purity Be materials with metal impurities in a ppm magnitude were fabricated by the pyrolysis of organometallic Be.
High Power Laser Science and Engineering
  • Publication Date: May. 05, 2017
  • Vol.5 Issue, 2 02000e10 (2017)
An automated, 0.5 Hz nano-foil target positioning system for intense laser plasma experiments
Ying Gao, Jianhui Bin, Daniel Haffa, Christian Kreuzer, Jens Hartmann, Martin Speicher, Florian H. Lindner, Tobias M. Ostermayr, Peter Hilz, Thomas F. Rösch, Sebastian Lehrack, Franz Englbrecht, Sebastian Seuferling, Max Gilljohann, Hao Ding, Wenjun Ma, Katia Parodi, and Jörg Schreiber
We report on a target system supporting automated positioning of nano-targets with a precision resolution of $4~\unicode[STIX]{x03BC}\text{m}$ in three dimensions. It relies on a confocal distance sensor and a microscope. The system has been commissioned to position nanometer targets with 1 Hz repetition rate. Integrating our prototype into the table-top ATLAS 300 TW-laser system at the Laboratory for Extreme Photonics in Garching, we demonstrate the operation of a 0.5 Hz laser-driven proton source with a shot-to-shot variation of the maximum energy about 27% for a level of confidence of 0.95. The reason of laser shooting experiments operated at 0.5 Hz rather than 1 Hz is because the synchronization between the nano-foil target positioning system and the laser trigger needs to improve.
High Power Laser Science and Engineering
  • Publication Date: Jun. 19, 2017
  • Vol.5 Issue, 2 02000e12 (2017)
Laser-induced microstructures on silicon for laser-driven acceleration experiments
Tina Ebert, Nico W. Neumann, Torsten Abel, Gabriel Schaumann, and Markus Roth
High Power Laser Science and Engineering
  • Publication Date: Jun. 19, 2017
  • Vol.5 Issue, 2 02000e13 (2017)