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Title: Improving the off-axis spatial resolution and dynamic range of the NIF X-ray streak cameras (invited)

Abstract

Here, we report simulationsand experiments that demonstrate an increasein spatial resolution ofthe NIF core diagnostic x-ray streak camerasby a factor of two, especially off axis. A designwas achieved by usinga corrector electron optic to flatten the field curvature at the detector planeand corroborated by measurement. In addition, particle in cell simulations were performed to identify theregions in the streak camera that contribute most to space charge blurring. Our simulations provide a tool for convolving syntheticpre-shot spectra with the instrument functionso signal levels can be set to maximize dynamic range for the relevant part of the streak record.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [3];  [1];  [4];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [5];  [5]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Kentech Instruments Ltd, Oxfordshire (United Kingdom)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Dept. of Electrical and Computer Engineering
  4. AWE Aldermaston, Reading (United Kingdom)
  5. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1281694
Report Number(s):
LLNL-CONF-694392
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Conference: Presented at: HTPD 2016, Madison, WI, United States, Jun 05 - Jun 09, 2016; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; x-ray optics; electron optics; cameras; space charge effects; anodes

Citation Formats

MacPhee, A. G., Dymoke-Bradshaw, A. K. L., Hares, J. D., Hassett, J., Hatch, B. W., Meadowcroft, A. L., Bell, P. M., Bradley, D. K., Datte, P. S., Landen, O. L., Palmer, N. E., Piston, K. W., Rekow, V. V., Hilsabeck, T. J., and Kilkenny, J. D. Improving the off-axis spatial resolution and dynamic range of the NIF X-ray streak cameras (invited). United States: N. p., 2016. Web. doi:10.1063/1.4960376.
MacPhee, A. G., Dymoke-Bradshaw, A. K. L., Hares, J. D., Hassett, J., Hatch, B. W., Meadowcroft, A. L., Bell, P. M., Bradley, D. K., Datte, P. S., Landen, O. L., Palmer, N. E., Piston, K. W., Rekow, V. V., Hilsabeck, T. J., & Kilkenny, J. D. Improving the off-axis spatial resolution and dynamic range of the NIF X-ray streak cameras (invited). United States. doi:10.1063/1.4960376.
MacPhee, A. G., Dymoke-Bradshaw, A. K. L., Hares, J. D., Hassett, J., Hatch, B. W., Meadowcroft, A. L., Bell, P. M., Bradley, D. K., Datte, P. S., Landen, O. L., Palmer, N. E., Piston, K. W., Rekow, V. V., Hilsabeck, T. J., and Kilkenny, J. D. 2016. "Improving the off-axis spatial resolution and dynamic range of the NIF X-ray streak cameras (invited)". United States. doi:10.1063/1.4960376. https://www.osti.gov/servlets/purl/1281694.
@article{osti_1281694,
title = {Improving the off-axis spatial resolution and dynamic range of the NIF X-ray streak cameras (invited)},
author = {MacPhee, A. G. and Dymoke-Bradshaw, A. K. L. and Hares, J. D. and Hassett, J. and Hatch, B. W. and Meadowcroft, A. L. and Bell, P. M. and Bradley, D. K. and Datte, P. S. and Landen, O. L. and Palmer, N. E. and Piston, K. W. and Rekow, V. V. and Hilsabeck, T. J. and Kilkenny, J. D.},
abstractNote = {Here, we report simulationsand experiments that demonstrate an increasein spatial resolution ofthe NIF core diagnostic x-ray streak camerasby a factor of two, especially off axis. A designwas achieved by usinga corrector electron optic to flatten the field curvature at the detector planeand corroborated by measurement. In addition, particle in cell simulations were performed to identify theregions in the streak camera that contribute most to space charge blurring. Our simulations provide a tool for convolving syntheticpre-shot spectra with the instrument functionso signal levels can be set to maximize dynamic range for the relevant part of the streak record.},
doi = {10.1063/1.4960376},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
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  • We report simulations and experiments that demonstrate an increase in spatial resolution of the NIF core diagnostic x-ray streak cameras by at least a factor of two, especially off axis. A design was achieved by using a corrector electron optic to flatten the field curvature at the detector plane and corroborated by measurement. In addition, particle in cell simulations were performed to identify the regions in the streak camera that contribute the most to space charge blurring. These simulations provide a tool for convolving synthetic pre-shot spectra with the instrument function so signal levels can be set to maximize dynamicmore » range for the relevant part of the streak record.« less
  • Ultrafast two-dimensional x-ray imaging is required for diagnosing laser-driven inertial confinement fusion plasmas. Image sampling technique with x-ray streak cameras can meet this requirement. Multi-imaging x-ray streak camera method (MIXS) with temporal and spatial resolutions of 10 ps and 15 {mu}m, respectively, has been developed and successfully utilized for diagnosing the uniformity and heating process of the imploded core plasmas. The two-dimensional sampling-image x-ray streak camera method is also presented. Two types of spectroscopic applications of the MIXS have been developed recently. One is multichannel MIXS, which has three MIXS channels with various spectral responses for time-resolved two-dimensional temperature measurementmore » of the plasmas. Another is monochromatic MIXS for temperature, density, and mixing measurement, in which monochromatic images with Bragg crystals are coupled to MIXS. {copyright} {ital 1997 American Institute of Physics.}« less
  • Eight Lawrence Livermore National Laboratory (LLNL) x-ray streak cameras have been characterized for spatial resolution and for the line spread function contribution to the temporal resolution. The contrast transfer function of a gold resolution grid of varying spatial frequency was measured for each camera. In addition, the image intensifier tube normally used for LLNL streak cameras (ITT 4113) was characterized separately. Limiting visual resolution for the system was found at 10 line pairs/mm (lp/mm) at camera photocathode with a corresponding temporal line spread function of 440 ..mu..m FWHM. Limiting visual resolution for the intensifier was found at 14 lp/mm atmore » intensifier photocathode. Comparisons to commerical streak camera models are underway.« less
  • A Monte Carlo model is developed and implemented to calculate the characteristics of x-ray induced secondary electron (SE) emission from a CsI photocathode used in an x-ray streak camera. Time distributions of emitted SEs are investigated with an incident x-ray energy range from 1 to 30 keV and a CsI thickness range from 100 to 1000 nm. Simulation results indicate that SE time distribution curves have little dependence on the incident x-ray energy and CsI thickness. The calculated time dispersion within the CsI photocathode is about 70 fs, which should be the temporal resolution limit of x-ray streak cameras that use CsI asmore » the photocathode material.« less