Reconstruction of vacuum magnetic flux in QUEST

Masaki Ishiguro, Kazuaki Hanada, Kazuo Nakamura, Osamu Mitarai, Hideki Zushi, Hiroshi Idei, Mizuki Sakamoto, Makoto Hasegawa, Yuta Higashizono, Yuichi Takase, Takashi Maekawa, Yasuaki Kishimoto, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


It is important to determine the best method for reconstructing the magnetic flux when eddy currents are significantly induced during magnetic measurement in spherical tokamaks (STs). Four methods for this reconstruction are investigated, and the calculated magnetic fluxes are compared to those measured in the cavity of a vacuum vessel. The results show that the best method is the one that uses currents from virtual coils for reconstruction. In this method, the placement of the virtual coils is optimized with numerical simulations using the Akaike information criterion (AIC), which indicates the goodness of fit of models used to fit measured data. The virtual coils are set on a line 15 cm outside the vacuum vessel.

Original languageEnglish
Article numberS2083
JournalPlasma and Fusion Research
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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