H.M. Johns , C.L. Fryer , S.R. Wood , C.J. Fontes , P.M. Kozlowski , N.E. Lanier , A. Liao , T.S. Perry , J.W. Morton , C.R.D. Brown , D.W. Schmidt , T. Cardenas , T.J. Urbatsch , P. Hakel , J. Colgan , S. Coffing , J. Cowan , D. Capelli , L.A. Goodwin , T.E. Quintana , J. Kline
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Point-projection X-ray </span>absorption spectroscopy perpendicular to the radiation flow measures the spatial profile of titanium ionization. The spectroscopic measurement utilizes a broadband capsule backlighter. Imaging and streak spectroscopy are used to characterize the size and spectrum of this source. Radiography provides an additional constraint by capturing the developing shock as the radiation flow becomes subsonic. The DANTE diagnostic is used to measure the halfraum temperature. We provide a </span></span>spectroscopic analysis of COAX data to determine temperature, and we describe experimental sources of uncertainty. The temperature is obtained by comparison to multi-temperature synthetic spectra post-processed from radiation-hydrodynamics simulations. Quantitative comparison between data and synthetic spectra generated from temperature profiles at relevant simulation times enable determination of a peak temperature of 114 </span></span><span><math><mo>±</mo></math></span> 8 eV at 265 <span><math><mo>±</mo></math></span> 22.4 <span><math><mi>μ</mi></math></span>m from the halfraum. This represents an improvement over the temperature uncertainties of previous radiation flow experiments. Further refinements to the spectroscopic analysis could achieve <span><math><mo>±</mo></math></span> 4 eV. The combination between space-resolved spectroscopy and radiography enables us to determine the distance from the halfraum of both the radiation front and the shock front at the time of measurement. For the example shown in this paper the radiation front position is 600–630 <span><math><mi>μ</mi></math></span>m at 3.43 <span><math><mo>±</mo></math></span> 0.16 ns and the shock front position is 633 <span><math><mi>μ</mi></math></span>m at 3.3 <span><math><mo>±</mo></math></span> 0.24 ns.</p></div>","PeriodicalId":49267,"journal":{"name":"High Energy Density Physics","volume":"39 ","pages":"Article 100939"},"PeriodicalIF":1.6000,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.hedp.2021.100939","citationCount":"7","resultStr":"{\"title\":\"A temperature profile diagnostic for radiation waves on OMEGA-60\",\"authors\":\"H.M. Johns , C.L. Fryer , S.R. Wood , C.J. Fontes , P.M. Kozlowski , N.E. Lanier , A. Liao , T.S. Perry , J.W. Morton , C.R.D. Brown , D.W. Schmidt , T. Cardenas , T.J. Urbatsch , P. Hakel , J. Colgan , S. Coffing , J. Cowan , D. Capelli , L.A. Goodwin , T.E. Quintana , J. Kline\",\"doi\":\"10.1016/j.hedp.2021.100939\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p><span>Predicting and matching radiation wave<span><span> propagation with computational models<span><span> has proven difficult. Information provided by experiments studying radiation flow has been limited when only radiation breakout is measured. We have developed the COAX (co-axial) diagnostic platform to provide spatial temperature profiles of a radiation wave through low density foams as a more detailed constraint for simulations. COAX uses a standard, laser-driven OMEGA-60 halfraum to drive radiation down a titanium-laden silicon oxide foam. Point-projection X-ray </span>absorption spectroscopy perpendicular to the radiation flow measures the spatial profile of titanium ionization. The spectroscopic measurement utilizes a broadband capsule backlighter. Imaging and streak spectroscopy are used to characterize the size and spectrum of this source. Radiography provides an additional constraint by capturing the developing shock as the radiation flow becomes subsonic. The DANTE diagnostic is used to measure the halfraum temperature. We provide a </span></span>spectroscopic analysis of COAX data to determine temperature, and we describe experimental sources of uncertainty. The temperature is obtained by comparison to multi-temperature synthetic spectra post-processed from radiation-hydrodynamics simulations. Quantitative comparison between data and synthetic spectra generated from temperature profiles at relevant simulation times enable determination of a peak temperature of 114 </span></span><span><math><mo>±</mo></math></span> 8 eV at 265 <span><math><mo>±</mo></math></span> 22.4 <span><math><mi>μ</mi></math></span>m from the halfraum. This represents an improvement over the temperature uncertainties of previous radiation flow experiments. 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A temperature profile diagnostic for radiation waves on OMEGA-60
Predicting and matching radiation wave propagation with computational models has proven difficult. Information provided by experiments studying radiation flow has been limited when only radiation breakout is measured. We have developed the COAX (co-axial) diagnostic platform to provide spatial temperature profiles of a radiation wave through low density foams as a more detailed constraint for simulations. COAX uses a standard, laser-driven OMEGA-60 halfraum to drive radiation down a titanium-laden silicon oxide foam. Point-projection X-ray absorption spectroscopy perpendicular to the radiation flow measures the spatial profile of titanium ionization. The spectroscopic measurement utilizes a broadband capsule backlighter. Imaging and streak spectroscopy are used to characterize the size and spectrum of this source. Radiography provides an additional constraint by capturing the developing shock as the radiation flow becomes subsonic. The DANTE diagnostic is used to measure the halfraum temperature. We provide a spectroscopic analysis of COAX data to determine temperature, and we describe experimental sources of uncertainty. The temperature is obtained by comparison to multi-temperature synthetic spectra post-processed from radiation-hydrodynamics simulations. Quantitative comparison between data and synthetic spectra generated from temperature profiles at relevant simulation times enable determination of a peak temperature of 114 8 eV at 265 22.4 m from the halfraum. This represents an improvement over the temperature uncertainties of previous radiation flow experiments. Further refinements to the spectroscopic analysis could achieve 4 eV. The combination between space-resolved spectroscopy and radiography enables us to determine the distance from the halfraum of both the radiation front and the shock front at the time of measurement. For the example shown in this paper the radiation front position is 600–630 m at 3.43 0.16 ns and the shock front position is 633 m at 3.3 0.24 ns.
期刊介绍：
High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings.
Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.
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