Diagnosis of core-shell mixing using absorption and emission spectra of a doped layer

We present theoretical analysis of a diagnostic method for detecting core-shell mixing in laser-fusion experiments, based on measuring the emission and absorption spectrum of a Ti-doped layer embedded within the target shell. The doped target layer is placed away from the shell-fuel interface so that the Ti remains relatively cool throughout the implosion. As a result, only absorption lines are observed, of 1s-2l transitions in ions with an unfilled L shell. However, for a sufficiently strong mixing, some Ti material migrates to the interface region and emits He- and H-like lines. A particular target experiment is simulated and the expected experimental signature calculated and analyzed. Copyright (C) 1996 Published by Elsevier Science Ltd