Abstract
To diagnose recombining plasmas obtained under detachment conditions in axisymmetric divertor regions of tokamaks (fusion devices) like JET, a spectroscopic analysis method has been developed. The method is based on the modeling of entire deuterium emission spectra composed of high- n Balmer lines extending to or beyond the series limit. A numerical code has been constructed by coupling a Stark line shape code to both an analytical approach developed for the smooth merging of lines into the continuum and a collisional-radiative model for the deuterium atomic level populations. The code has been incorporated into a fitting procedure allowing the simultaneous determination of the electron density and temperature of JET detached plasmas from deuterium line and continuum spectra.
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