Planarization of Isolated Defects on ICF Target Capsule Surfaces by Pulsed Laser Ablation

Alfonso, Noel; Carlson, Lane C.; Bunn, Thomas L.

doi:10.13182/FST15-224

Title: Planarization of Isolated Defects on ICF Target Capsule Surfaces by Pulsed Laser Ablation

Journal Article · Tue Aug 09 00:00:00 EDT 2016 · Fusion Science and Technology

DOI:https://doi.org/10.13182/FST15-224· OSTI ID:1305812

Alfonso, Noel ^[1]; Carlson, Lane C. ^[1]; Bunn, Thomas L. ^[2]

General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Demanding surface quality requirements for inertial confinement fusion (ICF) capsules motivated the development of a pulsed laser ablation method to reduce or eliminate undesirable surface defects. The pulsed laser ablation technique takes advantage of a full surface (4π) capsule manipulation system working in combination with an optical profiling (confocal) microscope. Based on the defect topography, the material removal rate, the laser pulse energy and its beam profile, a customized laser raster pattern is derived to remove the defect. The pattern is a table of coordinates and number of pulses that dictate how the defect will be vaporized until its height is level with the capsule surface. This paper explains how the raster patterns are optimized to minimize surface roughness and how surface roughness after laser ablation is simulated. The simulated surfaces are compared with actual ablated surfaces. Large defects are reduced to a size regime where a tumble finishing process produces very high quality surfaces devoid of high mode defects. The combined polishing processes of laser ablation and tumble finishing have become routine fabrication steps for National Ignition Facility capsule production.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; NA0001808

OSTI ID:: 1305812

Report Number(s):: LLNL-JRNL-677154; TRN: US1700141

Journal Information:: Fusion Science and Technology, Vol. 70, Issue 2; ISSN 1536-1055

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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