Diagnosis of laser-compressed shells based on absorption of core radiation
- 1 December 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 44 (12), 8429-8432
- https://doi.org/10.1103/physreva.44.8429
Abstract
A diagnostic method for laser-imploded targets, particularly plastic shells, is described. It is based on the observation of a peak in the continuum x-ray spectrum emitted from the target. The peak is the result of the high absorption of low-energy x rays from the implosion core by the cooler, compressed shell surrounding the core. In glass targets, where the shell absorption is typically dominated by bound-free transitions (photoionization), the position of this peak in the spectrum depends on the shell ρ Δr. In plastic targets, where the shell absorption is due mainly to free-free transitions (inverse bremsstrahlung), the position of the peak depends on the Δr/ for the shell. We study the relationship between the position of the peak and these two quantities, both analytically as well as with a simulation code.
Keywords
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