Speaker
Description
An experiment has been done at the National Ignition Facility (NIF) using a buried layer platform to study the radiative properties of non-local thermodynamic equilibrium (NLTE) gold plasma at an electron temperature of ∼3 keV and an electron density of ∼10$^{21}$cm$^{−3}$. The targets used consisted of a 625 μm diameter, 1900 Å thick dot with two different mixtures of Au and Zn: one at 1:2.25 atomic mix of Au and Zn and the other 1:4.5. The dot was placed in the center of a 2500 μm diameter, 10 μm thick beryllium tamper. Lasers heat the target from both sides for 4.0 ns. The size of the emitting volume vs time was measured side-on with time resolved x-ray imaging to infer the ion density versus time. The radiant x-ray power was measured with a low-resolution, absolutely calibrated x-ray spectrometer (DANTE). The Au L-shell and the Zn K-shell were measured simultaneously and time resolved with the same spectrometer and streak camera. The electron temperature was inferred from the measured zinc K-shell emission. A comparison is made of the relative sensitivities to the plasma conditions of the Au and Zn ionization which were inferred from the time resolved L- and K-shell emissions respectively.
This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-ABS-840296
| Presenting Author | Edward Marley |
|---|---|
| Presenting Author Email Address | marley2@llnl.gov |
| Presenting Author Affiliation | Lawrence Livermore National Laboratory |
| Country | United States of America |
| Presenting Author Gender | Male |
