Diagnosis of core-shell mixing with absorption and emission spectra of a doped layer. Final technical report [report]

1998 unpublished
We carried out the proposed program as planned. The research work has resulted in several publications, see attachments. The objective of this proposal was to develop a diagnostic method for core-shell mixing, based on the observation of absorption and emission lines of a doped layer, embedded within the shell, and correlate these sipatures with nuclear signatures of target performance. We showed the results of a numerical analysis applied to a particular doped target imploded on the OMEGA
more » ... m as a feasibility demonstration. Shell-core mixing which can occur during the deceleration phase of laserdriven implosion is believed to be the major limitation on target performance. We propose here a diagnostic method for detecting core-shell mixing based on the comparison of absorption and emission spectra due to a signature layer embedded in the target shell. Experimentally the method is simple as it does not require backlighting nor imaging. We have developed a mixing and radiation transport model used here to demonstrate the proposed diagnostic method. The proposal consists of target experiments on OMEGA as well as the interpretation and analysis of these experiments. We show that a signature layer of a high-Z dopant can be placed within the shell such that, in the absence of mixing, the emergent spectrum will only show absorption lines (of L-shell ionic species). Mixing causes the appearance of K-shell lines in emission. The more severe the mixing, the higher is the intensity of emission lines, as compared with that of the absorption MASTER
doi:10.2172/594468 fatcat:7xceltg73rhktow3rx4zzdar54