Experimental and Simulated Neon spectra in the 10 NM Wavelength Region from the Tore Supra Tokamak and the Reversed Field Pinch RFX
Experimental neon spectra, from the tokamak Tore Supra and the reversed field pinch RFX, have been simulated. The spectra include lines from three neon ionization states, and three neon ions. Collisional radiative models have been built for these three Ne ions, considering electron collisional excitation and radiative decay as populating processes of the excited states. These models give photon emission coefficients for the emitted lines at electron density and temperature values responding to experimental situations. Impurity modelling is performed using a 1-D impurity transport code, calculating the steady state radial distribution of the Neon ions. The neon line brightness' are evaluated in a post-process subroutine and simulated spectra are obtained. The parts of the spectra corresponding to a single ionization state do not depend on the experimental conditions and show good agreement with the single ionization state spectra. On the other hand, the superposition of the three spectra depends on the experimental conditions, as a consequence of the fact that the ion charge distribution depends not only on the radial profiles of the electron density and temperature, but also of the impurity transport coefficients. Simulations of the Neon spectra give confidence in the atomic physics calculations; moreover, they allow the determination of the transport coefficients in the plasma region emitting the considered ionization states.
Bibliographic Reference: Article: CEA EURATOM, (1999), 1663
Record Number: 199910908 / Last updated on: 1999-07-05
Original language: en
Available languages: en