# On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas

## Abstract

The effect of strong thermal radiation on the structure of quasi-stationary laser ablation fronts is investigated under the assumption that all the laser flux is absorbed at the critical surface. Special attention is paid to adequate formulation of the boundary-value problem for a steady-state planar ablation flow. The dependence of the laser-to-x-ray conversion efficiency ϕ{sub r} on the laser intensity I{sub L} and wavelength λ{sub L} is analyzed within the non-equilibrium diffusion approximation for radiation transfer. The scaling of the main ablation parameters with I{sub L} and λ{sub L} in the strongly radiative regime 1−ϕ{sub r}≪1 is derived. It is demonstrated that strongly radiating ablation fronts develop a characteristic extended cushion of “radiation-soaked” plasma between the condensed ablated material and the critical surface, which can efficiently suppress perturbations from the instabilities at the critical surface.

- Authors:

- Keldysh Institute of Applied Mathematics, Moscow (Russian Federation)
- (Russian Federation)

- Publication Date:

- OSTI Identifier:
- 22410338

- Resource Type:
- Journal Article

- Journal Name:
- Physics of Plasmas

- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; BOUNDARY-VALUE PROBLEMS; CONVERSION; DIFFUSION; DIFFUSION EQUATIONS; DISTURBANCES; EFFICIENCY; INSTABILITY; LASER RADIATION; PLASMA; STEADY-STATE CONDITIONS; THERMAL RADIATION; X RADIATION

### Citation Formats

```
Basko, M. M., E-mail: mmbasko@gmail.com, Novikov, V. G., National Research Nuclear University “MEPhI,” Moscow, Grushin, A. S., and RnD-ISAN/EUV Labs, Moscow, Troitsk.
```*On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas*. United States: N. p., 2015.
Web. doi:10.1063/1.4921334.

```
Basko, M. M., E-mail: mmbasko@gmail.com, Novikov, V. G., National Research Nuclear University “MEPhI,” Moscow, Grushin, A. S., & RnD-ISAN/EUV Labs, Moscow, Troitsk.
```*On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas*. United States. doi:10.1063/1.4921334.

```
Basko, M. M., E-mail: mmbasko@gmail.com, Novikov, V. G., National Research Nuclear University “MEPhI,” Moscow, Grushin, A. S., and RnD-ISAN/EUV Labs, Moscow, Troitsk. Fri .
"On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas". United States. doi:10.1063/1.4921334.
```

```
@article{osti_22410338,
```

title = {On the structure of quasi-stationary laser ablation fronts in strongly radiating plasmas},

author = {Basko, M. M., E-mail: mmbasko@gmail.com and Novikov, V. G. and National Research Nuclear University “MEPhI,” Moscow and Grushin, A. S. and RnD-ISAN/EUV Labs, Moscow, Troitsk},

abstractNote = {The effect of strong thermal radiation on the structure of quasi-stationary laser ablation fronts is investigated under the assumption that all the laser flux is absorbed at the critical surface. Special attention is paid to adequate formulation of the boundary-value problem for a steady-state planar ablation flow. The dependence of the laser-to-x-ray conversion efficiency ϕ{sub r} on the laser intensity I{sub L} and wavelength λ{sub L} is analyzed within the non-equilibrium diffusion approximation for radiation transfer. The scaling of the main ablation parameters with I{sub L} and λ{sub L} in the strongly radiative regime 1−ϕ{sub r}≪1 is derived. It is demonstrated that strongly radiating ablation fronts develop a characteristic extended cushion of “radiation-soaked” plasma between the condensed ablated material and the critical surface, which can efficiently suppress perturbations from the instabilities at the critical surface.},

doi = {10.1063/1.4921334},

journal = {Physics of Plasmas},

issn = {1070-664X},

number = 5,

volume = 22,

place = {United States},

year = {2015},

month = {5}

}