A number of codes are in use at JET to model the edge plasma. The range of edge codes is described as is the range of physics issues being explored by these codes. The balance between focussed modelling (that looking at particular physics effects) and integrated modelling (attempting to combine codes or encapsulate the physics from some codes into other codes) is examined.
[Show abstract][Hide abstract] ABSTRACT: The dust particle dynamics in tokamak plasmas, with emphasis on dust particle transport in the near surface region was investigated. The characteristics of the particle transport was examined for both smooth and rough wall surfaces. The implications of dust particle transport in the divertor region on the core plasma contamination with impurities was also examined. Interactions of dust particles with surface inhomogeneities can cause an escape of dust particles from near the wall region and flights toward the tokamak core. It was predicted that dust formation in and transport from the divertor region can play an important role in core plasma contamination.
Physics of Plasmas 05/2004; 11:3141. DOI:10.1063/1.1724834 · 2.14 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The EIRENE neutral gas transport Monte Carlo code has been developed initially for TEXTOR since the early 1980s. It is currently applied worldwide in most fusion laboratories for a large variety of different purposes. The main goal of code development was to provide a tool to investigate neutral gas transport in magnetically confined plasmas. But, due to its flexibility, it also can be used to solve more general linear kinetic transport equations by applying a stochastic rather than a numerical or analytical method of solution. Major applications of EIRENE are in connection with plasma fluid codes, in particular with the various versions of the B2 two-dimensional plasma edge fluid code. The combined code package B2-EIRENE was developed, again initially for TEXTOR applications, in the late 1980s. It too has become a standard tool in plasma edge science. It is currently mainly used for divertor configurations, such as by the ITER central team, to assist the design of the ITER divertor. Both the EIRENE and B2-EIRENE concepts are introduced and illustrated with sample applications.
Fusion Science and Technology 02/2005; 47(2). · 0.49 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: In JET, hydrocarbon transport in the inner divertor has been studied on a shot to shot basis by means of a quartz microbalance (QMB) mounted at the entrance of the inner divertor pump duct. Movement of the strike point down the vertical divertor target in the direction of the QMB increases the deposition. Largest carbon deposition is found with the strike point located at the corner of the horizontal divertor plate which offers a direct line-of-sight to the QMB. Monte-Carlo modelling with the ERO transport code reproduces the dependence of material deposition at the QMB on the plasma configuration. A further enhanced carbon flux to the QMB is detected if the strike point is moved for the first time to a location where a carbon layer was built up in former shots. This can be understood in terms of a much larger erosion yield for re-deposited carbon compared with bulk material.
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