- Conference date: 19-23 Mar 2000
- Location: Reno,Nevada (USA)
Frequently, the most energetic radiation emitted in abundance from a Z pinch is photons from the H- and He-like stages of the load element(s), i.e., the K shell. Consequently, the K-shell spectroscopy of Z pinches is well established and often used for diagnostics. Four recent advances are described in this paper that have been made in the diagnostic use and interpretation of K-shell radiation emitted from Z pinches. First, use of a trace element in double shell gas puff loads on Double EAGLE (at Maxwell Physics International) has demonstrated that it is the subsequently heated inner puff gas that radiates most of the K-shell photons from the assembled pinch. This finding is consistent with previous data analyses and theory which showed that the hot pinch interior radiates most of the K-shell energy, and shows that little or no mixing of the outer and inner puffs occurs during the implosion and assembly. Second, the use of the intercombination to resonance line ratio to infer density has been reconciled with density determinations based on absolute power. Third, photoexcitations have been shown to substantially alter the interpretation of this line ratio when it is applied to diagnosing the density profile from spatially resolved spectroscopy. Lastly, some wire array experiments using Al:Mg alloy loads at Sandia National Laboratories have specifically demonstrated how more spectral data, properly analyzed, translates into more detailed information about the pinch conditions.
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