Time- and polarization-dependent spectroscopic analysis of Mo x-pinches at the NTF.
Abstract
Time- and polarization-dependent L-shell radiation of Mo x-pinches at 0.9 MA has been studied in detail. The time histories of several F- and Ne-like Mo lines and the characteristic Ka line of Fe have been continuously recorded with a 6-channel Polychromator. A time-dependent collisional-radiative kinetic model has been developed and used to interpret time-gated L-shell Mo spectra and the Polychromator line histories. The model includes the ground state of every ionization stage of Mo and detailed structure for the O-, F-, Ne-, Na-, and Mg-like ionization stages. Hot electron beams generated in the x-pinch are incorporated in the model by integrating collision cross sections over a non-Maxwellian EDF. Since the effects of hot electrons on synthetic L-shell spectra are quite similar to the effects of increasing the electron temperature, additional information provided by polarization spectroscopy is essential for characterizing the electron beam. Recently, we have presented results on the K-shell spectropolarimetry of Ti x-pinches. Now, results of the first experiments on L-shell spectropolarimetry of Mo x-pinches are reported. This work demonstrates the importance of time histories and polarization properties in studies of the evolution and dynamics of pinch plasmas.
- Publication:
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APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2001
- Bibcode:
- 2001APS..DPPBO2011S