Diagnostics for Fast Ignition Science

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The concept for Electron Fast Ignition Inertial Confinement Fusion demands sufficient laser energy be transferred from the ignitor pulse to the assembled fuel core via {approx}MeV electrons. We have assembled a suite of diagnostics to characterize such transfer. Recent experiments have simultaneously fielded absolutely calibrated extreme ultraviolet multilayer imagers at 68 and 256eV; spherically bent crystal imagers at 4 and 8keV; multi-keV crystal spectrometers; MeV x-ray bremmstrahlung and electron and proton spectrometers (along the same line of sight); nuclear activation samples and a picosecond optical probe based interferometer. These diagnostics allow careful measurement of energy transport and deposition during and ... continued below

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PDF-file: 12 pages; size: 0.1 Mbytes

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MacPhee, A; Akli, K; Beg, F; Chen, C; Chen, H; Clarke, R et al. May 6, 2008.

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Description

The concept for Electron Fast Ignition Inertial Confinement Fusion demands sufficient laser energy be transferred from the ignitor pulse to the assembled fuel core via {approx}MeV electrons. We have assembled a suite of diagnostics to characterize such transfer. Recent experiments have simultaneously fielded absolutely calibrated extreme ultraviolet multilayer imagers at 68 and 256eV; spherically bent crystal imagers at 4 and 8keV; multi-keV crystal spectrometers; MeV x-ray bremmstrahlung and electron and proton spectrometers (along the same line of sight); nuclear activation samples and a picosecond optical probe based interferometer. These diagnostics allow careful measurement of energy transport and deposition during and following laser-plasma interactions at extremely high intensities in both planar and conical targets. Augmented with accurate on-shot laser focal spot and pre-pulse characterization, these measurements are yielding new insight into energy coupling and are providing critical data for validating numerical PIC and hybrid PIC simulation codes in an area that is crucial for many applications, particularly fast ignition. Novel aspects of these diagnostics and how they are combined to extract quantitative data on ultra high intensity laser plasma interactions are discussed, together with implications for full-scale fast ignition experiments.

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PDF-file: 12 pages; size: 0.1 Mbytes

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  • Presented at: High Temperature Plasma Diagnostics, Albuquerque, NM, United States, May 11 - May 15, 2008

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  • Report No.: LLNL-CONF-403625
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 938478
  • Archival Resource Key: ark:/67531/metadc898815

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 6, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 5, 2016, 2:15 p.m.

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MacPhee, A; Akli, K; Beg, F; Chen, C; Chen, H; Clarke, R et al. Diagnostics for Fast Ignition Science, article, May 6, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898815/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.