Plasma and Fusion Research

Volume 15, 2402047 (2020)

Regular Articles


Equilibrium Analysis of Tokamak Plasma Including the Eddy Current Effects in TOKASTAR-2
Ryohei IKEDA, Takaaki FUJITA, Hideki ARIMOTO, Atsushi OKAMOTO, Kouhei YASUDA, Sora KIMATA and Keitaro KADO
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
(Received 6 January 2020 / Accepted 22 May 2020 / Published 24 June 2020)

Abstract

The equilibrium analysis including the eddy current effect was performed for TOKASTAR-2 tokamak plasma by using TOSCA code that treated the vacuum vessel as the 2D axisymmetric model. In measurement of the vacuum magnetic field without plasma, it was found that the measured magnetic field and the calculated one using the model configuration which was based on the TOKASTAR-2 design did not agree. To improve the model, some parameters in the model (e.g. coil positions) were adjusted to minimize the difference between the calculated field and the measured one. In the equilibrium analysis, the poloidal beta βP and the plasma internal inductance li were determined minimizing the difference between the calculated field and the measured one for external probes. It was found that the solution calculated by the external measurement was roughly consistent with the internal field measurement, with difference in the plasma internal inductance of 0.10. The high-speed camera and the internal measurement results indicated that the shape and position of the plasma also have small errors. More improvement in the wall model would be needed to resolve these discrepancies.


Keywords

TOKASTAR-2, tokamak plasma, eddy current, MHD equilibrium analysis

DOI: 10.1585/pfr.15.2402047


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