Measuring the hot-electron population using time-resolved hard x-ray detectors on the NIF

M. Hohenberger; N. E. Palmer; G. LaCaille; E. L. Dewald; L. Divol; E. J. Bond; T. Döppner; J. J. Lee; R. L. Kauffman; J. D. Salmonson; C. A. Thomas; D. K. Bradley; C. Stoeckl; T. C. Sangster

doi:10.1117/12.2024960

26 September 2013 Measuring the hot-electron population using time-resolved hard x-ray detectors on the NIF

M. Hohenberger, N. E. Palmer, G. LaCaille, E. L. Dewald, L. Divol, E. J. Bond, T. Döppner, J. J. Lee, R. L. Kauffman, J. D. Salmonson, C. A. Thomas, D. K. Bradley, C. Stoeckl, T. C. Sangster

Author Affiliations +

Proceedings Volume 8850, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion II; 88500F (2013) https://doi.org/10.1117/12.2024960
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

Abstract

In laser-driven inertial confinement fusion, hot electrons can preheat the fuel and prevent compression of the capsule to ignition conditions. Measuring the hot-electron population in these high-intensity, laser-driven experiments is key to understanding the laser–plasma interaction and the resulting target evolution. This can be inferred from the bremsstrahlung generated by the interaction of the hot electrons with the target. At the National Ignition Facility (NIF), the filter-fluorescer x-ray diagnostic (FFLEX), a multichannel, hard x-ray spectrometer operating in the 20- to 500-keV range, was recently upgraded to provide time-resolved measurements of the bremsstrahlung spectrum. Characterization data is presented for the upgraded setup, as well as recent results from ignition-scale experiments.

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M. Hohenberger, N. E. Palmer, G. LaCaille, E. L. Dewald, L. Divol, E. J. Bond, T. Döppner, J. J. Lee, R. L. Kauffman, J. D. Salmonson, C. A. Thomas, D. K. Bradley, C. Stoeckl, and T. C. Sangster "Measuring the hot-electron population using time-resolved hard x-ray detectors on the NIF", Proc. SPIE 8850, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion II, 88500F (26 September 2013); https://doi.org/10.1117/12.2024960

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