A temperature profile diagnostic for radiation waves on OMEGA-60

Johns, Heather Marie; Fryer, Christopher Lee; Wood, Suzannah; Fontes, Christopher John; Kozlowski, Pawel Marek; Lanier, Nicholas Edward; Liao, Andy Sha; Perry, Theodore Sonne; Morton, John W.; Brown, Colin R. D; Schmidt, Derek William; Cardenas, Tana; Urbatsch, Todd James; Hakel, Peter; Colgan, James Patrick; Coffing, Shane Xavier; Cowan, Joseph Sarno; Capelli, Deanna; Goodwin, Lynne Alese; Quintana, Theresa E.; Hamilton, Christopher Eric; Fierro, Franklin; Wilson, Christopher Talker; Randolph, Randall Blaine; Donovan, Patrick Mark; Sedillo, Tom J.; Gonzales, Raymond Paul; Sherrill, Manolo Edgar; Douglas, Melissa Rae; Garbett, Warren; Hager, Jonathan D.; Kline, John L.

doi:10.1016/j.hedp.2021.100939

A temperature profile diagnostic for radiation waves on OMEGA-60

Journal Article · Mon May 17 00:00:00 EDT 2021 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2021.100939· OSTI ID:1784699

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Atomic Weapons Establishment (AWE) Plc., Readings (United Kingdom)
Lockheed Martin Corp., Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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. Here, 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 μm 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 μm at 3.43 ± 0.16 ns and the shock front position is 633 μm at 3.3 ± 0.24 ns.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1784699

Alternate ID(s):: OSTI ID: 1784470

Report Number(s):: LA-UR--20-22563

Journal Information:: High Energy Density Physics, Journal Name: High Energy Density Physics Vol. 39; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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