LLE Review Quarterly Report (January-March 2001). Volume 86

Technical Report · Thu Mar 01 04:00:00 EST 2001

DOI:https://doi.org/10.2172/1191132· OSTI ID:1191132

Sources, John M. ^[1]

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1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics

This volume of LLE Review, covering January-March 2001, includes a report on the characterization of direct-drive implosion core conditions using time-resolved Ar K-shell spectroscopy. This work was carried out by a team that included S. P. Regan, J. A. Delettrez, P. A. Jaanimagi, B. Yaakobi, V. A. Smalyuk, F. J. Marshall, D. D. Meyerhofer, and W. Seka of the Laboratory for Laser Energetics (LLE), University of Rochester; D. A. Haynes, Jr. of the Department of Engineering Physics, University of Wisconsin; and C. F. Hooper, Jr. of the Department of Physics, University of Florida. The experiments involved the implosion of polymer shells filled with Ar-doped deuterium gas driven with up to 24-kJ, 1-ns square laser pulses smoothed with 1-THz, 2-D smoothing by spectral dispersion (SSD) and polarization smoothing (PS). The emissivity-averaged core electron temperature and density were inferred from the measured time-dependent Ar K-shell spectral line shapes. Electron densities in excess of 2.5 × 10²⁴ cm^-3 and electron temperatures ~2.5 keV were measured in these experiments. This represents the highest combination of electron temperature and density measured for these types of implosions in laser-driven inertial fusion experiments. Other articles in this volume are titled: Study of Direct-Drive, DT-Gas-Filled-Plastic-Capsule Implosions Using Nuclear Diagnostics on OMEGA; A Consistent Measurement-Based Picture of Core-Mix in Direct-Drive Implosions on OMEGA; High-Resolution Neutron Imaging of Laser-Imploded DT Targets; The Smoothing Performance of Ultrafast Pickets on the NIF; Tests of EXAFS on OMEGA: Feasibility for Shock Heating Measurements; and, Microhardness and Indention Fracture of Potassium Dihydrogen Phosphate (KDP).

• Research Organization: Univ. of Rochester, NY (United States). Laboratory for Laser Energetics
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
• DOE Contract Number: FC03-92SF19460
• OSTI ID: 1191132
• Report Number(s): DOE/SF/19460--393
• Country of Publication: United States
• Language: English

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