X-ray Thomson scattering measurements of temperature and density from multi-shocked CH capsules

作者：Fletcher L B^*; Kritcher A; Pak A; Ma T; Doeppner T; Fortmann C; Divol L; Landen O L; Vorberger J; Chapman D A; Gericke D O; Falcone R W; Glenzer S H

来源：Physics of Plasmas, 2013, 20(5): 056316.

DOI：10.1063/1.4807032

Proof-of-principle measurements of the electron densities, temperatures, and ionization states of spherically compressed multi-shocked CH (polystyrene) capsules have been achieved using spectrally resolved x-ray Thomson scattering. A total energy of 13.5 kJ incident on target is used to compress a 70 mu m thick CH shell above solid-mass density using three coalescing shocks. Separately, a laser-produced zinc He-a x-ray source at 9 keV delayed 200 ps-800 ps after maximum compression is used to probe the plasma in the non-collective scattering regime. The data show that x-ray Thomson scattering enables a complete description of the time-dependent hydrodynamic evolution of shock-compressed CH capsules, with a maximum measured density of rho %26gt; 6 g cm(-3). In addition, the results demonstrate that accurate measurements of x-ray scattering from bound-free transitions in the CH plasma demonstrate strong evidence that continuum lowering is the primary ionization mechanism of carbon L-shell electrons.

• 出版日期2013-5