Spatially resolved X-ray emission measurements of the residual velocity during the stagnation phase of inertial confinement fusion implosion experiments

Ruby, J. J.; Field, J. E.; Ma, T.; Spears, B. K.; Benedetti, L. R.; Bradley, D. K.; Berzak Hopkins, L. F.; Casey, D. T.; Döppner, T.; Eder, D.; Fittinghoff, D.; Grim, G.; Hatarik, R.; Hinkel, D. E.; Izumi, N.; Khan, S. F.; Kritcher, A. L.; Moody, J. D.; Nagel, S. R.; others, and

doi:10.1063/1.4956468

Title: Spatially resolved X-ray emission measurements of the residual velocity during the stagnation phase of inertial confinement fusion implosion experiments

Journal Article · Fri Jul 15 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4956468· OSTI ID:22600044

Ruby, J. J.; Field, J. E.; Ma, T.; Spears, B. K.; Benedetti, L. R.; Bradley, D. K.; Berzak Hopkins, L. F.; Casey, D. T.; Döppner, T.; Eder, D.; Fittinghoff, D.; Grim, G.; Hatarik, R.; Hinkel, D. E.; Izumi, N.; Khan, S. F.; Kritcher, A. L.; Moody, J. D.; Nagel, S. R. ^[1]; others, and

Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)

A technique for measuring residual motion during the stagnation phase of an indirectly driven inertial confinement experiment has been implemented. This method infers a velocity from spatially and temporally resolved images of the X-ray emission from two orthogonal lines of sight. This work investigates the accuracy of recovering spatially resolved velocities from the X-ray emission data. A detailed analytical and numerical modeling of the X-ray emission measurement shows that the accuracy of this method increases as the displacement that results from a residual velocity increase. For the typical experimental configuration, signal-to-noise ratios, and duration of X-ray emission, it is estimated that the fractional error in the inferred velocity rises above 50% as the velocity of emission falls below 24 μm/ns. By inputting measured parameters into this model, error estimates of the residual velocity as inferred from the X-ray emission measurements are now able to be generated for experimental data. Details of this analysis are presented for an implosion experiment conducted with an unintentional radiation flux asymmetry. The analysis shows a bright localized region of emission that moves through the larger emitting volume at a relatively higher velocity towards the location of the imposed flux deficit. This technique allows for the possibility of spatially resolving velocity flows within the so-called central hot spot of an implosion. This information would help to refine our interpretation of the thermal temperature inferred from the neutron time of flight detectors and the effect of localized hydrodynamic instabilities during the stagnation phase. Across several experiments, along a single line of sight, the average difference in magnitude and direction of the measured residual velocity as inferred from the X-ray and neutron time of flight detectors was found to be ∼13 μm/ns and ∼14°, respectively.

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OSTI ID:: 22600044

Journal Information:: Physics of Plasmas, Vol. 23, Issue 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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Comparison of implosion core metrics: A 10 ps dilation X-ray imager vs a 100 ps gated microchannel plate Nagel, S. R.; Benedetti, L. R.; Bradley, D. K. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4959917	journal	August 2016
Dynamic high energy density plasma environments at the National Ignition Facility for nuclear science research Cerjan, Ch J.; Bernstein, L.; Hopkins, L. Berzak Journal of Physics G: Nuclear and Particle Physics, Vol. 45, Issue 3 https://doi.org/10.1088/1361-6471/aa8693	journal	February 2018
Subpercent-Scale Control of 3D Low Modes of Targets Imploded in Direct-Drive Configuration on OMEGA Michel, D. T.; Igumenshchev, I. V.; Davis, A. K. Physical Review Letters, Vol. 120, Issue 12 https://doi.org/10.1103/PhysRevLett.120.125001	journal	March 2018

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCURACY
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CONFIGURATION
EMISSION
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HOT SPOTS
IMAGES
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Title: Spatially resolved X-ray emission measurements of the residual velocity during the stagnation phase of inertial confinement fusion implosion experiments

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