Toward the fabrication of a 5-μm-resolution Wolter microscope for the National Ignition Facility (invited)

Champey, Patrick R.; Kolodziejczak, Jeffery; Kozioziemski, Bernard; Davis, Jacqueline; Griffith, Charles; Kester, Tom; Kilaru, Kiranmayee; Meekham, Amy; Menapace, Joe; Ramsey, Brian; Roberts, Oliver J.; Sanchez, Javier; Singam, Panini; Smith, W. Scott; Speegle, Chet; Stahl, Mark; Suratwala, Tayyab; Thomas, Nick; Young, Mark; Vogel, Julia K.

doi:10.1063/5.0101304

Title: Toward the fabrication of a 5-μm-resolution Wolter microscope for the National Ignition Facility (invited)

Journal Article · Wed Nov 02 00:00:00 EDT 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0101304· OSTI ID:2204948

^[1];

^[2]; Davis, Jacqueline ^[1]; Griffith, Charles ^[1]; Kester, Tom ^[1]; Kilaru, Kiranmayee ^[3]; Meekham, Amy ^[4]; Menapace, Joe ^[2];

^[1];

^[3]; Sanchez, Javier ^[4];

^[5]; Smith, W. Scott ^[1]; Speegle, Chet ^[1]; Stahl, Mark ^[1];

^[2]; Thomas, Nick ^[1]; Young, Mark ^[4];

^[6]

NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Universities Space Research Association, Huntsville, AL (United States)
Jacobs Space Exploration, Huntsville, AL (United States)
Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Universidad de Zaragoza (Spain)

Advancements in computer-controlled polishing, metrology, and replication have led to an x-ray mirror fabrication process that is capable of producing high-resolution Wolter microscopes. We present the fabrication and test of a nickel–cobalt replicated full-shell x-ray mirror that was electroformed from a finely figured and polished mandrel. This mandrel was designed for an 8-m source-to-detector-distance microscope, with 10× magnification, and was optimized to reduce shell distortions that occur within 20 mm of the shell ends. This, in combination with an improved replication tooling design and refined bath parameters informed by a detailed COMSOL Multiphysics® model, has led to reductions in replication errors in the mirrors. Mandrel surface fabrication was improved by implementing a computer-controlled polishing process that corrected the low-frequency mandrel figure error and achieved <2.0 nm RMS convergence error. X-ray tests performed on a pair of mirror shells replicated from the mandrel have demonstrated <10 μm full-width at half-maximum (FWHM) spatial resolution. Here, we discuss the development process, highlight results from metrology and x-ray testing, and define a path for achieving a program goal of 5 μm FWHM resolution.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2204948

Alternate ID(s):: OSTI ID: 1896819

Report Number(s):: LLNL-JRNL-856590; 1086166

Journal Information:: Review of Scientific Instruments, Vol. 93, Issue 11; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Toward the fabrication of a 5-μm-resolution Wolter microscope for the National Ignition Facility (invited)

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