Impurity Seeding in ASDEX Upgrade Tokamak Modeled by COREDIV Code

The self‐consistent COREDIV code is used to simulate discharges in a tokamak plasma, especially the influence of impurities during nitrogen and argon seeding on the key plasma parameters. The calculations are performed with and without taking into account the W prompt redeposition in the divertor ar...

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Bibliographic Details
Published in:Contributions to plasma physics (1988) 2016-08, Vol.56 (6-8), p.772-777
Main Authors: Gała̧zka, K., Ivanova-Stanik, I., Bernert, M., Czarnecka, A., Kallenbach, A., Zagörski, R., ASDEX Upgrade Team
Format: Article
Language:English
Subjects:
ASDEX Upgrade
core plasma
edge plasma
Flushing
Impurities
impurity seeding
impurity transport
integrated modelling
Mathematical models
Nucleation
Plasma
Plasma (physics)
Power loss
Tokamak
Tokamak devices
Transport
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Summary:The self‐consistent COREDIV code is used to simulate discharges in a tokamak plasma, especially the influence of impurities during nitrogen and argon seeding on the key plasma parameters. The calculations are performed with and without taking into account the W prompt redeposition in the divertor area and are compared to the experimental results acquired on ASDEX Upgrade tokamak (shots #29254 and #29257). For both impurities the modeling shows a better agreement with the experiment in the case without prompt redeposition. It is attributed to higher average tungsten concentration, which on the other hand seriously exceeds the experimental value. By turning the prompt redeposition process on, the W concentration is lowered, what, in turn, results in underestimation of the radiative power losses. By analyzing the influence of the transport coefficients on the radiative power loss and average W concentration it is concluded that the way to compromise the opposing tendencies is to include the edge‐localized mode flushing mechanism into the code, which dominates the experimental particle and energy balance. Also performing the calculations with both anomalous and neoclassical diffusion transport mechanisms included is suggested.
ISSN:0863-1042
1521-3986
DOI:10.1002/ctpp.201610008