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Title: X-ray tests of a two-dimensional stigmatic imaging scheme with variable magnifications

A two-dimensional stigmatic x-ray imaging scheme, consisting of two spherically bent crystals, one concave and one convex, was recently proposed [M. Bitter et al., Rev. Sci. Instrum. 83, 10E527 (2012)]. We report that the Bragg angles and the radii of curvature of the two crystals of this imaging scheme are matched to eliminate the astigmatism and to satisfy the Bragg condition across both crystal surfaces for a given x-ray energy. In this paper, we consider more general configurations of this imaging scheme, which allow us to vary the magnification for a given pair of crystals and x-ray energy. The stigmatic imaging scheme has been validated for the first time by imaging x-rays generated by a micro-focus x-ray source with source size of 8.4 μm validated by knife-edge measurements. Results are presented from imaging the tungsten Lα1 emission at 8.3976 keV, using a convex Si-422 crystal and a concave Si-533 crystal with 2d-spacings of 2.21707 Å and 1.65635 Å and radii of curvature of 500 ± 1 mm and 823 ± 1 mm, respectively, showing a spatial resolution of 54.9 μm. Finally, this imaging scheme is expected to be of interest for the two-dimensional imaging of laser produced plasmas.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4]
  1. Chongqing University (China). Key Laboratory of Optoelectronic Technology and System of Ministry of Education
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division
  4. Inrad Optics, Northvale, NJ (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-657029
Journal ID: ISSN 0034-6748
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1406457

Lu, J., Bitter, M., Hill, K. W., Delgado-Aparicio, L. F., Efthimion, P. C., Pablant, N. A., Beiersdorfer, P., Caughey, T. A., and Brunner, J.. X-ray tests of a two-dimensional stigmatic imaging scheme with variable magnifications. United States: N. p., Web. doi:10.1063/1.4890248.
Lu, J., Bitter, M., Hill, K. W., Delgado-Aparicio, L. F., Efthimion, P. C., Pablant, N. A., Beiersdorfer, P., Caughey, T. A., & Brunner, J.. X-ray tests of a two-dimensional stigmatic imaging scheme with variable magnifications. United States. doi:10.1063/1.4890248.
Lu, J., Bitter, M., Hill, K. W., Delgado-Aparicio, L. F., Efthimion, P. C., Pablant, N. A., Beiersdorfer, P., Caughey, T. A., and Brunner, J.. 2014. "X-ray tests of a two-dimensional stigmatic imaging scheme with variable magnifications". United States. doi:10.1063/1.4890248. https://www.osti.gov/servlets/purl/1406457.
@article{osti_1406457,
title = {X-ray tests of a two-dimensional stigmatic imaging scheme with variable magnifications},
author = {Lu, J. and Bitter, M. and Hill, K. W. and Delgado-Aparicio, L. F. and Efthimion, P. C. and Pablant, N. A. and Beiersdorfer, P. and Caughey, T. A. and Brunner, J.},
abstractNote = {A two-dimensional stigmatic x-ray imaging scheme, consisting of two spherically bent crystals, one concave and one convex, was recently proposed [M. Bitter et al., Rev. Sci. Instrum. 83, 10E527 (2012)]. We report that the Bragg angles and the radii of curvature of the two crystals of this imaging scheme are matched to eliminate the astigmatism and to satisfy the Bragg condition across both crystal surfaces for a given x-ray energy. In this paper, we consider more general configurations of this imaging scheme, which allow us to vary the magnification for a given pair of crystals and x-ray energy. The stigmatic imaging scheme has been validated for the first time by imaging x-rays generated by a micro-focus x-ray source with source size of 8.4 μm validated by knife-edge measurements. Results are presented from imaging the tungsten Lα1 emission at 8.3976 keV, using a convex Si-422 crystal and a concave Si-533 crystal with 2d-spacings of 2.21707 Å and 1.65635 Å and radii of curvature of 500 ± 1 mm and 823 ± 1 mm, respectively, showing a spatial resolution of 54.9 μm. Finally, this imaging scheme is expected to be of interest for the two-dimensional imaging of laser produced plasmas.},
doi = {10.1063/1.4890248},
journal = {Review of Scientific Instruments},
number = 11,
volume = 85,
place = {United States},
year = {2014},
month = {7}
}