Theoretical Studies of L-shell X-ray Line Polarization and M-shell X-ray Spectroscopic Emission from Highly Ionized Xenon Ions

The field of high-energy-density (HED) physics has important applications, such as inertial confinement fusion and the development of intense radiation sources. X-ray plasma spectroscopy and spectropolarimetry are integral to the study of HED plasmas. Comparison of x-ray line emission spectra to non-local thermodynamic equilibrium (non-LTE) modeling and inclusion of non-thermal effects provides insights to laboratory-produced plasmas and underlying atomic processes. Xenon (Xe) radiation has been extensively studied for lithography applications and Xe gas-puffs have proven to be efficient radiation sources. Consequently, a new M-shell Xe non-LTE model was constructed using atomic database calculations with the Flexible Atomic Code (FAC) and is presented in this dissertation. From this new model, plasma parameter-sensitive synthetic spectra are presented and benchmarked with two different HED plasma experiments. Notable results include a robust description of emission lines arising from ionization stages Co-like to Ar-like Xe that are identified in both experiments, the first is a laser-irradiated gas-puff and the second is a reversed polarity gas-puff Z-pinch. The difference between spectra was mostly caused by non-thermal effects manifesting in the Z-pinch as characteristic L-shell Xe lines. HED plasmas are able to produce beams of non-Maxwellian electrons that may cause partially polarized x-ray line emission. Expanding upon this work, comprehensive theoretical study of L-shell Xe and the effects of x-ray line polarization on dielectronic satellite lines is accomplished. X-ray line degree of polarization and polarization-dependent spectra of Na-like Xe influenced by electron beams were calculated using different formalism and methods. Accuracy of FAC atomic data was explored. Future development of current M-shell Xe model and L-shell Xe polarization work will focus on applications to various HED plasma experiments with Xe as dopants or uniform targets.

Level thesis:degree_level

Doctorate Degree

Year dc:date.issued

2023

Author dc:creator

• Gill, Amandeep Kaur

Advisor dc:contributor.advisor

• Safronova, Alla

Committee members dc:contributor.committeemember

• Kantsyrev, Victor
• Rodrigue, Melodi
• Tscherbul, Timur
• Tucker, Matthew

• HED Plasmas
• Non-LTE Modeling
• X-ray Line Polarization

Handle dc:identifier.uri

http://hdl.handle.net/11714/8456

OAI identifier oai:identifier

oai:scholarwolf.unr.edu:11714/8456