Collisional-Radiative modeling of the transient excitation of a carbon atoms beam crossing a tokamak plasma edge

15th International Congress on Plasma Physics; 13th Latin American Workshop on Plasma Physics

Bultel, Arnaud^1 ; Schneider, Ioan F.^2 ; Benredjem, Djamel^3 ; Monier-Garbet, Pascale^4

UMR CNRS 6614 CORIA, Université de Rouen, Avenue de l'Université, 76801 Saint-Etienne du Rouvray, France^1

FRE 3102 LOMC, Universite du Havre, rue Philippe Lebon, 76058 Le Havre, France^2

LAC, UPR CNRS 3321, University of Paris Sud-Orsay, France^3

IRFM, CEA Cadarache, Saint-Paul-lez-Durance, France^4

关键词: Beam crossings;    Collisional radiative model;    Electron-induced process;    Fusion machines;    Penetration velocity;    Population densities;    Tokamak plasmas;    Transient excitation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/511/1/012045/pdf
DOI  :  10.1088/1742-6596/511/1/012045

来源: IOP

【 摘 要 】

A time-dependent collisional-radiative (CR) model is elaborated in the purpose of modeling the penetration of an atomic carbon beam in the edge plasma of a fusion machine in order to probe it. The excited states population densities of the beam are assumed to be modified by electron-induced processes only. All momentum transfer is neglected: the penetration velocity is assumed constant. In typical conditions for the electron density and temperature gradients (ne/x 1020m-4and Te/x 107K m-1), the results illustrate the electrons efficiency to ionize the beam. With a velocity equal to 1 km s-1, the beam is ionized in 20 /is in these conditions, which corresponds to a penetration depth of 2 cm. During the conversion in ions, the atomic beam is sufficiently excited to emits spectra whose measurement in coupling with the present CR model can provide information on ne/x and Te/x.