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Title: Surface oxygen micropatterns on glow discharge polymer targets by photo irradiation

Abstract

Recent simulations predict surface oxygen may be a significant source of disruptive perturbations in the implosion process of glow-discharge polymers (GDP) ablators at the National Ignition Facility. GDP material held in ambient atmospheric conditions showed an increase in mass when stored in light transparent containers, which suggests that photo exposure is a driving force for oxygen absorption. To investigate if surface oxygen is a contributing factor of disruptive perturbations during implosion, a method to imprint a periodic micropattern of oxygen on the surface of GDP was developed and used to fabricate a flat sample for empirical testing. Photo exposure using collimated blue light was used to generate micropatterns of surface oxygen on the GDP material. The periodic oxygen micropattern was confirmed by secondary ion mass spectrometry (SIMS) and energy dispersive spectroscopy. A SIMS depth profile showed the atomic percent of oxygen ranged from 8 at. % near the surface to 1 at. % at a depth of 2 μm in a sample exposed for 4 min. The molecular interactions formed between the GDP and oxygen molecules were characterized using Fourier transform infrared resonance (FTIR), which showed the formation of hydroxyl (O–H) and carbonyl (C=O) bonds. The FTIR enabled the oxygen mass uptake asmore » a function of photo exposure time to be quantified (resolved to typically 0.05 at. % oxygen). This experimental protocol was then applied to produce a GDP flat part with a periodic 75 μm wavelength micropattern of photo exposed (oxygen rich) and masked (oxygen deficient) regions. The micropatterned GDP ablators developed in this work are being used to assess the effect of surface oxygen on disruptive perturbations during the inertial confinement fusion implosion process.« less

Authors:
 [1];  [2]; ORCiD logo [2];  [1];  [1]; ORCiD logo [1];  [2]; ORCiD logo [1]
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  1. General Atomics, San Diego, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1240959
Alternate Identifier(s):
OSTI ID: 1421162
Report Number(s):
LLNL-JRNL-677957
Journal ID: ISSN 0021-8979; JAPIAU
Grant/Contract Number:  
AC52-07NA27344; NA0001808
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 8; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Reynolds, Hannah, Baxamusa, Salmaan, Haan, Steven W., Fitzsimmons, Paul, Carlson, Lane, Farrell, Mike, Nikroo, Abbas, and Watson, Brian J. Surface oxygen micropatterns on glow discharge polymer targets by photo irradiation. United States: N. p., 2016. Web. doi:10.1063/1.4942219.
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Reynolds, Hannah, Baxamusa, Salmaan, Haan, Steven W., Fitzsimmons, Paul, Carlson, Lane, Farrell, Mike, Nikroo, Abbas, & Watson, Brian J. Surface oxygen micropatterns on glow discharge polymer targets by photo irradiation. United States. https://doi.org/10.1063/1.4942219
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Reynolds, Hannah, Baxamusa, Salmaan, Haan, Steven W., Fitzsimmons, Paul, Carlson, Lane, Farrell, Mike, Nikroo, Abbas, and Watson, Brian J. Wed . "Surface oxygen micropatterns on glow discharge polymer targets by photo irradiation". United States. https://doi.org/10.1063/1.4942219. https://www.osti.gov/servlets/purl/1240959.
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@article{osti_1240959,
title = {Surface oxygen micropatterns on glow discharge polymer targets by photo irradiation},
author = {Reynolds, Hannah and Baxamusa, Salmaan and Haan, Steven W. and Fitzsimmons, Paul and Carlson, Lane and Farrell, Mike and Nikroo, Abbas and Watson, Brian J.},
abstractNote = {Recent simulations predict surface oxygen may be a significant source of disruptive perturbations in the implosion process of glow-discharge polymers (GDP) ablators at the National Ignition Facility. GDP material held in ambient atmospheric conditions showed an increase in mass when stored in light transparent containers, which suggests that photo exposure is a driving force for oxygen absorption. To investigate if surface oxygen is a contributing factor of disruptive perturbations during implosion, a method to imprint a periodic micropattern of oxygen on the surface of GDP was developed and used to fabricate a flat sample for empirical testing. Photo exposure using collimated blue light was used to generate micropatterns of surface oxygen on the GDP material. The periodic oxygen micropattern was confirmed by secondary ion mass spectrometry (SIMS) and energy dispersive spectroscopy. A SIMS depth profile showed the atomic percent of oxygen ranged from 8 at. % near the surface to 1 at. % at a depth of 2 μm in a sample exposed for 4 min. The molecular interactions formed between the GDP and oxygen molecules were characterized using Fourier transform infrared resonance (FTIR), which showed the formation of hydroxyl (O–H) and carbonyl (C=O) bonds. The FTIR enabled the oxygen mass uptake as a function of photo exposure time to be quantified (resolved to typically 0.05 at. % oxygen). This experimental protocol was then applied to produce a GDP flat part with a periodic 75 μm wavelength micropattern of photo exposed (oxygen rich) and masked (oxygen deficient) regions. The micropatterned GDP ablators developed in this work are being used to assess the effect of surface oxygen on disruptive perturbations during the inertial confinement fusion implosion process.},
doi = {10.1063/1.4942219},
journal = {Journal of Applied Physics},
number = 8,
volume = 119,
place = {United States},
year = {Wed Feb 24 00:00:00 EST 2016},
month = {Wed Feb 24 00:00:00 EST 2016}
}
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    Works referencing / citing this record:

    Improving ICF implosion performance with alternative capsule supports
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    Probing the seeding of hydrodynamic instabilities from nonuniformities in ablator materials using 2D velocimetry
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    • Physics of Plasmas, Vol. 25, Issue 9
    • DOI: 10.1063/1.5047943

    Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators
    journal, September 2018

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