[Table of Contents]

Plasma and Fusion Research

Volume 6, 2403140 (2011)

Regular Articles

Internal Transport Barrier Analysis Including Impurities in Tokamak and Helical Reactor Plasmas
Yoshihito HORI, Kozo YAMAZAKI, Tetsutarou OISHI, Hideki ARIMOTO and Tatsuo SHOJI
Nagoya University, Furo-cho, Chikusaku, Nagoya 464-8603, Japan
(Received 10 December 2010 / Accepted 21 April 2011 / Published 11 November 2011)


The operation with Internal Transport Barrier (ITB) is expected as a high performance operation. ITB is utilized to improve core plasma confinement in the reversed magnetic shear. It is considered that the changes of core plasma profile by the ITB cause changes of impurity transport. In a large fusion reactor, high-Z materials will be used as plasma facing components because high loads of heat and particles concentrate there. However, high-Z impurities from these components cause large radiation loss and dilute the fuel even if the amount of impurities is small. Therefore, in this study, firstly, the ITB formation which includes the effects of the magnetic shear and perturbed profiles by the pellet injection was simulated using the Toroidal Transport Analysis Linkage code TOTAL. Secondly, we analyzed transport of the tungsten impurities using an impurity model in TOTAL code, and compared the impurity profile in the case with ITB to the one without ITB in the tokamak reactor. The impurities decreased in the ITB formation region when ITB was formed, and the outward flux of total impurity density was observed there. It can be expected that outward flux of impurities is generated by the temperature and the density gradients.


transport simulation, internal transport barrier, impurity, pellet injection, tokamak reactor

DOI: 10.1585/pfr.6.2403140


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This paper may be cited as follows:

Yoshihito HORI, Kozo YAMAZAKI, Tetsutarou OISHI, Hideki ARIMOTO and Tatsuo SHOJI, Plasma Fusion Res. 6, 2403140 (2011).