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Title: Diagnosing residual motion via the x-ray self emission from indirectly driven inertial confinement implosions

In an indirectly driven implosion, non-radial translational motion of the compressed fusion capsule is a signature of residual kinetic energy not coupled into the compressional heating of the target. A reduction in compression reduces the peak pressure and nuclear performance of the implosion. Measuring and reducing the residual motion of the implosion is therefore necessary to improve performance and isolate other effects that degrade performance. Using the gated x-ray diagnostic, the x-ray Bremsstrahlung emission from the compressed capsule is spatially and temporally resolved at x-ray energies of >8.7 keV, allowing for measurements of the residual velocity. Here details of the x-ray velocity measurement and fitting routine will be discussed and measurements will be compared to the velocities inferred from the neutron time of flight detectors.
Authors:
; ; ; ; ; ; ; ; ; ;  [1] ;  [2]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  2. Laboratory for Laser Energetics, Rochester, New York 14623 (United States)
Publication Date:
OSTI Identifier:
22308647
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BREMSSTRAHLUNG; CAPSULES; HEATING; IMPLOSIONS; INERTIAL CONFINEMENT; KEV RANGE; KINETIC ENERGY; NEUTRON DETECTORS; PERFORMANCE; TARGETS; THERMONUCLEAR REACTIONS; TIME-OF-FLIGHT METHOD; VELOCITY; X-RAY EMISSION ANALYSIS