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17 January 2006
Christina Back
ABSTRACT: Outstanding discrepancies between data and calculations of laser-produced plasmas in recombination have been observed since the 1980's. Although modeling of the hydrodynamics may partially account for differences, there are indications that non-LTE atomic kinetics may be the dominant cause of discrepancies. ÊExperiments to investigate non-LTE effects were recently performed at the NIKE laser on low density Ti-doped aerogels. ÊÊTi L-shell data spanning a range of 0.5 to 4 keV were obtained with a transmission grating diagnostic coupled to Si diodes. The data is examined and compared to calculations with a goal of developing absolute emission measurements that can provide new tests of the non-LTE physics.
Christina Back is an experimental physicist with an expertise in the study of radiation in high energy density plasmas. ÊShe received her B. S. in Physics from Yale in 1984 and earned her Ph.D. in plasma physics from the University of Florida in 1989. ÊAfter a 2 year postdoc with the CNRS at the Ecole Polytechnique in France, she spent 13 years at LLNL in the ICF and HEDS programs, specializing in the study of radiation transport and spectroscopy. ÊIn addition to serving on APS and National Research Council committees, Dr. Back is a fellow of the American Physical Society, and has been elected a General Councillor of the APS. Currrently Christina Back is Target Production coordinator and Radiation Physics manager at General Atomics. ÊShe is responsible for identifying new opportunities for target fabrication advances in HEDP as well as conducting research to develop novel radiation sources for lithographic and other applications. ÊWith her knowledge of experimental methods and target requirements, she interfaces closely with colleagues in the national and international ICF and HEDP research programs.
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