Surface Modification of ICF Target Capsules by Pulsed Laser Ablation

Carlson, Lane C.; Johnson, Michael A.; Bunn, Thomas L.

doi:10.13182/FST15-248

Title: Surface Modification of ICF Target Capsules by Pulsed Laser Ablation

Journal Article · 30 June 2016 · Fusion Science and Technology

DOI: https://doi.org/10.13182/FST15-248 · OSTI ID:1305842

Carlson, Lane C. ^[1]; Johnson, Michael A. ^[2]; Bunn, Thomas L. ^[2]

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

Topographical modifications of spherical surfaces are imprinted on National Ignition Facility (NIF) target capsules by extending the capabilities of a recently developed full surface (4π) laser ablation and mapping apparatus. The laser ablation method combines the precision, energy density and long reach of a focused laser beam to pre-impose sinusoidal modulations on the outside surface of High Density Carbon (HDC) capsules and the inside surface of Glow Discharge Polymer (GDP) capsules. Sinusoidal modulations described in this paper have sub-micron to 10’s of microns vertical scale and wavelengths as small as 30 μm and as large as 200 μm. The modulated patterns are created by rastering a focused laser fired at discrete capsule surface locations for a specified number of pulses. The computer program developed to create these raster patterns uses inputs such as laser beam intensity profile, the material removal function, the starting surface figure and the desired surface figure. The patterns are optimized to minimize surface roughness. Lastly, in this paper, simulated surfaces are compared with actual ablated surfaces measured using confocal microscopy.

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

Sponsoring Organization:: USDOE

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

OSTI ID:: 1305842

Report Number(s):: LLNL-JRNL--678552

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

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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