Opacity of germanium and silicon in ICF plasmas

Djamel Benredjem (1) , Guillaume Mondet (1) , Annette Calisti (2) , Frank Gilleron (3) , Jean-Christophe Pain (3)

1 LAC - Laboratoire Aimé Cotton
2 PIIM - Physique des interactions ioniques et moléculaires
3 DAM/DIF - DAM Île-de-France

Because germanium and silicon may be used as dopants in the ablator of ignition target, the knowledge of their opacities is crucial. We have calculated the opacity by using two approaches. The first one utilizes a detailed line calculation in which the atomic database is provided by the MCDF code. A lineshape code was then adapted to the calculation of opacity profiles. Because the calculation time is prohibitive when the number of lines is huge, a second approach, combining detailed line calculations and statistical calculations is used. This approach necessitates much smaller calculation than the first one and is then well suited for extensive calculations. The monochromatic opacity and the Rosseland and Planck mean opacities are calculated for various relevant densities and temperatures.

Domaines: Physique des plasmas [physics.plasm-ph]

Djamel Benredjem, Guillaume Mondet, Annette Calisti, Frank Gilleron, Jean-Christophe Pain. Opacity of germanium and silicon in ICF plasmas. SPIE LASE, Feb 2013, San Francisco, United States. ⟨10.1117/12.2008508⟩. ⟨hal-00910189⟩