Characterization of an imploding cylindrical plasma for electron transport studies using x-ray emission spectroscopy

Dozières, M.; Hansen, S.; Forestier-Colleoni, P.; McGuffey, C.; Kawahito, D.; Bailly-Grandvaux, M.; Bhutwala, K.; Krauland, C. M.; Wei, M. S.; Gourdain, P.; Davies, J. R.; Matsuo, K.; Fujioka, S.; Campbell, E. M.; Peebles, J. L.; Santos, J. J.; Batani, D.; Zhang, S.; Beg, Farhat N.

doi:10.1063/1.5125271

DOE OSTI · 1633763

Characterization of an imploding cylindrical plasma for electron transport studies using x-ray emission spectroscopy

Dozières, M.·Hansen, S.·Forestier-Colleoni, P.·McGuffey, C.·Kawahito, D.·Bailly-Grandvaux, M.·Bhutwala, K.·Krauland, C. M.·Wei, M. S.·Gourdain, P.·Davies, J. R.·Matsuo, K.·Fujioka, S.·Campbell, E. M.·Peebles, J. L.·Santos, J. J.·Batani, D.·Zhang, S.·Beg, Farhat N.

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Abstract

We report here on the characterization of the conditions of an imploding cylindrical plasma by time-resolved x-ray emission spectroscopy. Knowledge about this implosion platform can be applied to studies of particle transport for inertial confinement fusion schemes or to astrophysical plasmas. A cylindrical Cl-doped CH foam within a tube of solid CH was irradiated by 36 beams (I total ~5×10 14 W/cm 2 , 1.5ns square pulse, and E total ~ 16.2kJ) of the OMEGA-60 laser to radially compress the CH toward the axis. The analysis of the time-resolved spectra showed that the compression can be described by four distinct phases, each presenting different plasma conditions. First the ablation of the cylinder is dominant; second, the foam is heated and induces a significant jump in emission intensities; third, the temperature and density of the foam reaches a maximum; and finally, the plasma expands. Ranges for the plasma temperature were inferred with the atomic physics code SCRAM (Spectroscopic Collisional-Radiative Atomic Model) and the experimental data have been compared to hydrodynamic simulations performed with the 2D code FLASH, which showed a similar implosion dynamic over time.

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70 PLASMA PHYSICS AND FUSION TECHNOLOGY atomic physics computer graphics electron beams electronic transport hydrodynamics simulations molecular physics optical properties plasma confinement plasma temperature x-ray emission spectroscopy x-ray fluorescence

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Dozières, M., Hansen, S., Forestier-Colleoni, P., McGuffey, C., Kawahito, D., Bailly-Grandvaux, M., Bhutwala, K., Krauland, C. M., Wei, M. S., Gourdain, P., Davies, J. R., Matsuo, K., Fujioka, S., Campbell, E. M., Peebles, J. L., Santos, J. J., Batani, D., Zhang, S., Beg, Farhat N.. 2020-02-04. Characterization of an imploding cylindrical plasma for electron transport studies using x-ray emission spectroscopy. https://doi.org/10.1063/1.5125271

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