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Title: Investigating high speed phenomena in laser plasma interactions using dilation x-ray imager (invited)

The DIlation X-ray Imager (DIXI) is a new, high-speed x-ray framing camera at the National Ignition Facility (NIF) sensitive to x-rays in the range of ≈2–17 keV. DIXI uses the pulse-dilation technique to achieve a temporal resolution of less than 10 ps, a ≈10× improvement over conventional framing cameras currently employed on the NIF (≈100 ps resolution), and otherwise only attainable with 1D streaked imaging. The pulse-dilation technique utilizes a voltage ramp to impart a velocity gradient on the signal-bearing electrons. The temporal response, spatial resolution, and x-ray sensitivity of DIXI are characterized with a short x-ray impulse generated using the COMET laser facility at Lawrence Livermore National Laboratory. At the NIF a pinhole array at 10 cm from target chamber center (tcc) projects images onto the photocathode situated outside the NIF chamber wall with a magnification of ≈64×. DIXI will provide important capabilities for warm-dense-matter physics, high-energy-density science, and inertial confinement fusion, adding important capabilities to temporally resolve hot-spot formation, x-ray emission, fuel motion, and mix levels in the hot-spot at neutron yields of up to 10{sup 17}. We present characterization data as well as first results on electron-transport phenomena in buried-layer foil experiments.
Authors:
; ; ; ; ;  [1] ; ; ; ;  [2] ; ;  [3]
  1. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States)
  2. General Atomics, P.O. Box 85608, San Diego, California 92186-5608 (United States)
  3. Kentech Instruments Ltd., Wallingford, Oxfordshire OX10 (United Kingdom)
Publication Date:
OSTI Identifier:
22308955
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; CAMERAS; ELECTRIC POTENTIAL; ELECTRONS; ENERGY DENSITY; FOILS; HOT SPOTS; INERTIAL CONFINEMENT; KEV RANGE; LASER-PRODUCED PLASMA; LASERS; LAWRENCE LIVERMORE NATIONAL LABORATORY; NEUTRONS; PHOTOCATHODES; PULSE TECHNIQUES; SENSITIVITY; SPATIAL RESOLUTION; TARGET CHAMBERS; THERMONUCLEAR FUELS; X-RAY RADIOGRAPHY