In-flight measurements of capsule shell adiabats in laser-driven implosions |
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Authors: | Kritcher A L Döppner T Fortmann C Ma T Landen O L Wallace R Glenzer S H |
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Affiliation: | Lawrence Livermore National Laboratory, California 94551, USA. |
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Abstract: | We present the first x-ray Thomson scattering measurements of temperature and density from spherically imploding matter. The shape of the Compton downscattered spectrum provides a first-principles measurement of the electron velocity distribution function, dependent on T(e) and the Fermi temperature T(F)~n(e)(2/3). In-flight compressions of Be and CH targets reach 6-13 times solid density, with T(e)/T(F)~0.4-0.7 and Γ(ii)~5, resulting in minimum adiabats of ~1.6-2. These measurements are consistent with low-entropy implosions and predictions by radiation-hydrodynamic modeling. |
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