The design, performance, and application of an atomic-force microscope-based profilometer

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Rayleigh-Taylor instabilities during implosions of inertially confined fusion (ICF) capsules affect capsule performance. During acceleration, surface imperfections grow and can, if large enough, lead to an asymmetric implosion or even shell breakup. For this reason, characterizing the topography of target capsules is extremely important. We have developed a profilometer based on an atomic force microscope combined with a precision rotary air bearing. Averaged 1D surface height power spectra obtained with this instrument are converted to 2D mode spectra, which are used as input to hydrodynamic simulations. We describe the design of the system and its performance in terms of runout ... continued below

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21 p.

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McEachern, R.L.; Moore, C.E. & Wallace, R.J. October 1, 1994.

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Description

Rayleigh-Taylor instabilities during implosions of inertially confined fusion (ICF) capsules affect capsule performance. During acceleration, surface imperfections grow and can, if large enough, lead to an asymmetric implosion or even shell breakup. For this reason, characterizing the topography of target capsules is extremely important. We have developed a profilometer based on an atomic force microscope combined with a precision rotary air bearing. Averaged 1D surface height power spectra obtained with this instrument are converted to 2D mode spectra, which are used as input to hydrodynamic simulations. We describe the design of the system and its performance in terms of runout and repeatability. We also discuss the simulation of these measurements and the statistics involved in averaging 1D power spectra. Finally, we show the application of this measurement technique to capsules whose surfaces have been modified by laser ablation, resulting in a well-defined surface topography. This special case provides an excellent test for the system, since the expected results are exactly calculable.

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21 p.

Notes

OSTI as DE96002739

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  • 41. annual American Vacuum Society symposium, Denver, CO (United States), 24-28 Oct 1994

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  • Other: DE96002739
  • Report No.: UCRL-JC--117322
  • Report No.: CONF-941001--17
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 147728
  • Archival Resource Key: ark:/67531/metadc621933

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1994

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 1:25 p.m.

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McEachern, R.L.; Moore, C.E. & Wallace, R.J. The design, performance, and application of an atomic-force microscope-based profilometer, article, October 1, 1994; California. (digital.library.unt.edu/ark:/67531/metadc621933/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.