L -shell spectroscopy of Au as a temperature diagnostic tool

Abstract

In order to develop plasma diagnostic for reduced-size hot Hohlraums under laser irradiation, we have studied the $L$ -shell emission from highly charged gold ions in the SuperEBIT electron beam ion trap. The resolving power necessary to identify emission features from individual charge states in a picket-fence pattern has been estimated, and the observed radiation features have been compared with atomic structure calculations. We find that the strong $3d_{5∕2}\to 2p_{3∕2}$ emission features are particularly useful in determining the charge state distribution and average ion charge $⟨Z⟩$ , which are strongly sensitive to the electron temperature.