Target Fabrication Technology and New Functional Materials for Laser Fusion and Laser-Plasma Experiment

Nagai, Keiji; Norimatsu, T.; Izawa, Yasukazu

doi:10.1585/jspf.80.626

Cited by 15 publications

(9 citation statements)

References 79 publications

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“…[4][5][6][7] Fuel target technology is a key issue in fast-ignition research. 8,9) To achieve a breakeven gain, the fast-ignition realization experiment (FIREX) was designed and started with the construction of a (10 kJ)/(1 ps) laser in the first phase of FIREX (FIREX-1) 5,7,10) and a cryogenic DT fuel target.…”

mentioning

confidence: 99%

Low-Density-Plastic-Foam Capsule of Resorcinol/Formalin and (Phloroglucinolcarboxylic Acid)/Formalin Resins for Fast-Ignition Realization Experiment (FIREX) in Laser Fusion Research

Ito

Nagai

Nakai

et al. 2006

jjap

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confidence: 99%

Low-Density-Plastic-Foam Capsule of Resorcinol/Formalin and (Phloroglucinolcarboxylic Acid)/Formalin Resins for Fast-Ignition Realization Experiment (FIREX) in Laser Fusion Research

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Nagai

Nakai

et al. 2006

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“…Various hollow spherical targets have been developed for inertial confinement fusion (ICF) experiments [27,28,29]. Examples include hollow glass spheres, hollow polymer spheres (an example is shown in Fig.…”

Section: Existing Optionsmentioning

confidence: 99%

Hollow pellet injection for magnetic fusion

Wang,

Hoffbauer,

Hollmann

et al. 2019

Preprint

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Precise delivery of mass to burning plasmas is a problem of growing interest in magnetic fusion. The answers to how much mass is necessary and sufficient can vary depending on parameters such as the type of atoms involved, the type of applications, plasma conditions, mass injector, and injection timing. Motivated by edge localized mode (ELM) control in H-mode plasmas, disruption mitigation and other applications in magnetic fusion, we report progress and new possibilities in mass delivery based on hollow pellets. Here, a hollow pellet refers to a spherical shell mass structure with a hollow core. Based on an empirical model of pellet ablation, coupled with BOUT++ simulations of ELM triggering threshold, hollow pellets are found to be attractive in comparison with solid spheres for ELM control. By using hollow pellets, it is possible to tailor mass delivery to certain regions of edge plasmas while minimizing core contamination and reducing the total amount of mass needed. We also include experimental progress in mass delivery experiments, in-situ diagnostics and hollow pellet fabrication, and emphasize new experimental possibilities for ELM control based on hollow pellets. A related application is the disruption mitigation scheme using powder encapsulated inside hollow shells. Further experiments will also help to resolve known discrepancies between theoretical predictions and experiments in using mass injection for ELM control and lead to better predictive models for ELM stability and triggering.

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“…The project founded highest conversion efficiency from laser light to EUV [1,2]. The target fabrication technology has long history and has developed, recently by using nanotechnology [3][4][5][6]. To control plasma density, low density and porous materials are often used as laser targets as well as gas [7] and solid [8,9] targets.…”

Section: Introductionmentioning

confidence: 99%

Target fabrication of low-density and nanoporous tin oxide as laser targets to generate extreme ultraviolet

Nagai

Norimatsu

et al. 2005

SPIE Proceedings

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Our institute has been investigating laser-produced tin plasma and EUV emission, and found the highest conversion efficiency of 3% at 13.5 nm in 2% bandwidth. In the present paper, we introduce fabrication methods of densitycontrolled tin targets to generate relatively monochromatic EUV with keeping similar conversion efficiency.The first method is the nano-template method, where liquid tin solution was immersed into a polymer film with monodispersed size nanoparticle. The density can be controlled by tin concentration of the solution. The target can be classified into mass-limited target. We have shown a tendency of monochromatic EUV emission around 13.5 nm with decreasing of tin density. The intensity was higher than tin foil with bulk density. The tendency has a merit to mitigate heat effect of the first EUV mirror. The fabrication method has another merit to control not only density but also the poresize of tin oxide to be 100 nm ~ 10 µm. Recent experiments exhibited an EUV character depending on the poresize.The second is liquid crystalline template method to obtain porous tin oxide. The precursor with tin oxide and cellulose provides mechanically stable and transparent film. The film has wavy sub-microstructure derived from microscopic liquid crystal domain structure. The method is simple and short duration for the hydrolysis reaction to solidify tin compound. This material has a merit of feasibility of fabrication, and was applied for rotation target for 10 Hz and 5 kHz laser repetition.

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Target Fabrication Technology and New Functional Materials for Laser Fusion and Laser-Plasma Experiment

Cited by 15 publications

References 79 publications

Low-Density-Plastic-Foam Capsule of Resorcinol/Formalin and (Phloroglucinolcarboxylic Acid)/Formalin Resins for Fast-Ignition Realization Experiment (FIREX) in Laser Fusion Research

Low-Density-Plastic-Foam Capsule of Resorcinol/Formalin and (Phloroglucinolcarboxylic Acid)/Formalin Resins for Fast-Ignition Realization Experiment (FIREX) in Laser Fusion Research

Hollow pellet injection for magnetic fusion

Target fabrication of low-density and nanoporous tin oxide as laser targets to generate extreme ultraviolet

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