Skip to Main content Skip to Navigation

Spectroscopic Study of Highly Ionised Plasmas : Detailed and Statistical Approaches

Abstract : The description of spectralproperties of highly ionized plasmas – asthose studied in stellar atmospheres, facilitiesfor nuclear fusion, or laser-plasmasexperiments – may require different types ofinterpretation, among which the detailed line by-line accounting which relies on Hamiltoniandiagonalization and the statistical approachbased on the characterization of spectralstructures through distribution moments.My PhD work aims at developing statisticalmethods dealing with situations whereabundant lines gather in Unresolved TransitionArrays (UTA).To this end, analytical and numerical analysishave been carried out. On one hand, high-ordermoments of spin-orbit energy have beenderived using averaging calculation techniquesbased on second quantization results andangular momentum algebra. On the other hand,after implementing a post-processing programfor both detailed and UTA computations of theFlexible Atomic Code (FAC), emission andabsorption spectra of tungsten plasmas havebeen studied in tokamak-equivalentthermodynamic conditions.Results of this thesis should hopefully stimulatefurther analysis on averages computationinvolving complex transition processes.
Complete list of metadatas
Contributor : Abes Star :  Contact
Submitted on : Tuesday, January 30, 2018 - 4:16:08 PM
Last modification on : Wednesday, October 14, 2020 - 3:40:39 AM
Long-term archiving on: : Friday, May 25, 2018 - 9:54:05 PM


Version validated by the jury (STAR)


  • HAL Id : tel-01696804, version 1


Xieyu Na. Spectroscopic Study of Highly Ionised Plasmas : Detailed and Statistical Approaches. High Energy Physics - Theory [hep-th]. Université Paris Saclay (COmUE), 2017. English. ⟨NNT : 2017SACLS592⟩. ⟨tel-01696804⟩



Record views


Files downloads