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

Abstract

Rayleigh--Taylor instabilities during implosions of inertially confined fusion 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 one-dimensional (1D) surface height power spectra obtained with this instrument are converted to two-dimensional mode spectra that 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. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}

Authors:
; ;  [1]
  1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
64943
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology, A
Additional Journal Information:
Journal Volume: 13; Journal Issue: 3; Other Information: PBD: May 1995
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; LASER TARGETS; LASER IMPLOSIONS; INERTIAL CONFINEMENT; RAYLEIGH-TAYLOR INSTABILITY; COMPUTERIZED SIMULATION; MEASURING INSTRUMENTS; MICROSCOPES; DESIGN; PERFORMANCE

Citation Formats

McEachern, R L, Moore, C E, and Wallace, R J. The design, performance, and application of an atomic force microscope-based profilometer. United States: N. p., 1995. Web. doi:10.1116/1.579662.
McEachern, R L, Moore, C E, & Wallace, R J. The design, performance, and application of an atomic force microscope-based profilometer. United States. doi:10.1116/1.579662.
McEachern, R L, Moore, C E, and Wallace, R J. Mon . "The design, performance, and application of an atomic force microscope-based profilometer". United States. doi:10.1116/1.579662.
@article{osti_64943,
title = {The design, performance, and application of an atomic force microscope-based profilometer},
author = {McEachern, R L and Moore, C E and Wallace, R J},
abstractNote = {Rayleigh--Taylor instabilities during implosions of inertially confined fusion 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 one-dimensional (1D) surface height power spectra obtained with this instrument are converted to two-dimensional mode spectra that 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. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}},
doi = {10.1116/1.579662},
journal = {Journal of Vacuum Science and Technology, A},
number = 3,
volume = 13,
place = {United States},
year = {1995},
month = {5}
}