Numerical study of an X-ray-driven carbon foil
The radiation hydrodynamics of a 125 micron thin carbon layer illuminated by thermal radiation of T(rad) = 200 eV temperature is studied within a multigroup radiation model. Whereas a major part of the incident photons deposit their energy by K-shell absorption close to the surface, soft photons below the K edge and hard photons (frequencies above 800 eV) penetrate deeper into the material and drive a heat wave with a sharp front. A nonablated mass fraction of 20% is accelerated with a hydrodynamic efficiency of 11%. About half of the incident radiation flux is re-emitted by the heated carbon plasma. The heat front trajectory can be reproduced by the analytical heating wave model when effective opacity parameters corresponding to the most penetrating components are used.
Bibliographic Reference: Article: Laser and Particle Beams, Vol. 9 (1991) No. 3, pp. 759-768
Record Number: 199210154 / Last updated on: 1994-12-02
Original language: en
Available languages: en