Thomson scattering measurements from asymmetric interpenetrating plasma flows

Abstract

Imaging Thomson scattering measurements of collective ion-acoustic fluctuations have been utilized to determine ion temperature and density from laser produced counter-streaming asymmetric flows. Two foils are heated with 8 laser beams each, 500 J per beam, at the Omega Laser facility. Measurements are made 4 mm from the foil surface using a 60 J 2ω probe laser with a 200 ps pulse length. Measuring the electron density and temperature from the electron-plasma fluctuations constrains the fit of the multi-ion species, asymmetric flows theoretical form factor for the ion feature such that the ion temperatures, ion densities, and flow velocities for each plasma flow are determined.

Development of a krypton-doped gas symmetry capsule platform for x-ray spectroscopy of implosion cores on the NIF

“…The x-ray emission was recorded with the NIF X-ray spectrometer (NXS). 19 The NXS consists of a singly curved elliptical Bragg crystal, and for this set of experiments covered a spectral range of 10.8-18.2 keV at a resolving power E/∆E of ≥60. Three separate channels are simultaneously run on the NXS, allowing for different filtrations and the establishment of spectral dispersion by the use of the filter K-edges.…”