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The Relative Importance of Wall and Target Impurity Sources in Divertor Tokamaks
Author(s) -
Stangeby P. C.,
Elder J. D.
Publication year - 1992
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150320328
Subject(s) - divertor , tokamak , plasma , impurity , core (optical fiber) , jet (fluid) , atomic physics , materials science , point source , physics , mechanics , monte carlo method , diii d , nuclear engineering , nuclear physics , optics , statistics , mathematics , quantum mechanics , engineering
Experiments in JET operated with X‐point discharges have shown that wall‐produced impurity influxes can be significantly more effective at contaminating the core plasma than plate‐produced influxes. The DIVIMP (Divertor Impurity) Monte Carlo impurity production/transport code is used to study core contamination efficiency assuming a wide variety of models/assumptions for the plasma edge behaviour, including forced fuel recirculation (pumped divertor mode) and spontaneous flow reversal. It is found that for an open (X‐point) divertor geometry and for plasma conditions typical of low e operation that a wall source is ∼3‐5x more effective at contaminating the core than a target source of equal strength. For high n̄ e conditions the wall source is >10x more effective than the target source.