Evolution of the Hot Spot Density and Temperature on the National Ignition Facility
Abstract
The electron density and temperature and their evolution in the hot spot of a Kr-doped, big-foot implosion target were measured for the first time using an absolutely calibrated, streaked, high-resolution x-ray spectrometer named dHIRES on the National Ignition Facility (NIF). The electron density was inferred through Stark-broadened line shapes and the temperature was derived from the relative intensities of dielectronic satellites to the resonance line. The data show that the hot spot density peaks after the x-ray bang time while its temperature peaks before the x-ray bang time. Such trend is compared with a 1-D calculation of the Symcap implosion using a self-similar temperature profile, as well as collisional-radiative calculations for line intensities and shapes.
This work was performed under the auspices of the U.S. Department of Energy by Princeton Plasma Physics Laboratory under contract DE-AC02-09CH11466 and by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DPPBO4001G