Modelling with the 2D multifluid code TECXY of TEXTOR discharges in the presence of DED

Abstract

A study of the influence of the Dynamic Ergodic Divertor (DED) on transport and radiation of intrinsic carbon in TEXTOR has been done, based on calculations with the 2D multifluid code TECXY and experimental data from spectroscopic diagnostics involving the brilliances of lines emitted by C +2 and C +4 lines in the UV range. This allows to investigate the radiation properties of carbon and the contamination of the main plasma for a variety of experimental conditions. The physical model in the TECXY code was extended to incorporate the increased radial transport in the stochastic magnetic field by applying a model of "optimal paths". Two DED operational modes (m/n = 12/4 and 3/1), both resonant at the q = 3 surface, have been experimentally studied so far. In the present paper we have concentrated on the 12/4 mode of operation. The radial decay length of the 12/4 mode is very short. In order to maximize the field penetration, the plasma column has to be shifted horizontally towards the HFS. Both the simulation and the experimental evidence indicate that the main changes are related to the horizontal shift of the plasma column rather than to the stochastic transport itself. A high recycling regime with good impurity screening is predicted for a shifted position of the plasma column.

Reactive species in Ar+H2plasma-aided nanofabrication: two-dimensional discharge modelling

“…It is also instructive to note that 2D fluid models have been extensively utilized in the study of a number of plasma physics related fields, including fusion studies [47], and are well represented in the literature (see e.g. [47][48][49][50][51][52][53][54] and references therein).…”

“…It is also instructive to note that 2D fluid models have been extensively utilized in the study of a number of plasma physics related fields, including fusion studies [47], and are well represented in the literature (see e.g. [47][48][49][50][51][52][53][54] and references therein). 2D fluid models in particular have been employed in investigations of capacitively coupled plasma (CCP), inductively coupled plasma (ICP) and RF plasma discharges [48][49][50][51] as they provide an effective way to investigate species density and electron temperature profiles with variation of parameters such as reactor pressure with acceptable accuracy and computational cost [48].…”

TECXY simulations of multi‐species impurity seeding in DEMO reactor

“…Braginskii equations are solved numerically with the use of the two‐dimensional TECXY code, which apply coupled iterative and evolutionary numerical methods . The TECXY code solves transport equations for few impurity species and all ionization stages associated with these impurities.…”

“…Braginskii equations are solved numerically with the use of the two-dimensional TECXY code, which apply coupled iterative and evolutionary numerical methods. [6,7] The TECXY code solves transport equations for few impurity species and all ionization stages associated with these impurities. Atomic processes like ionization, recombination, excitation, and charge exchange, as well as prompt re-deposition and sputtering, are involved in the TECXY code.…”