Quantifying equation-of-state and opacity errors using integrated supersonic diffusive radiation flow experiments on the National Ignition Facility

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4919025· OSTI ID:22408361

Moore, A. S.; Morton, J.; Allan, S.; Bazin, N.; Benstead, J.; Bentley, C.; Comley, A. J.; Garbett, W.; Reed, L.; Stevenson, R. M. ^[1]; Kline, J. L.; Cowan, J.; Flippo, K.; Hamilton, C.; Lanier, N. E.; Mussack, K.; Obrey, K.; Schmidt, D. W.; Taccetti, J. M. ^[2]; others, and

---

1. AWE Plc., Aldermaston, Reading RG7 4PR (United Kingdom)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

A well diagnosed campaign of supersonic, diffusive radiation flow experiments has been fielded on the National Ignition Facility. These experiments have used the accurate measurements of delivered laser energy and foam density to enable an investigation into SESAME's tabulated equation-of-state values and CASSANDRA's predicted opacity values for the low-density C{sub 8}H{sub 7}Cl foam used throughout the campaign. We report that the results from initial simulations under-predicted the arrival time of the radiation wave through the foam by ≈22%. A simulation study was conducted that artificially scaled the equation-of-state and opacity with the intended aim of quantifying the systematic offsets in both CASSANDRA and SESAME. Two separate hypotheses which describe these errors have been tested using the entire ensemble of data, with one being supported by these data.

• OSTI ID: 22408361
• Journal Information: Physics of Plasmas, Vol. 22, Issue 4; Other Information: (c) 2015 Crown; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPUTERIZED SIMULATION
DENSITY
DIFFUSION
EQUATIONS OF STATE
ERRORS
EXPERIMENTAL DATA
FOAMS
HYPOTHESIS
LASER RADIATION
OPACITY
RADIATION TRANSPORT
SUPERSONIC FLOW
US NATIONAL IGNITION FACILITY