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

doi:10.1585/pfr.5.S2083

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

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

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 language	English
Article number	S2083
Journal	Plasma and Fusion Research
Volume	5
DOIs	https://doi.org/10.1585/pfr.5.S2083
Publication status	Published - 2010

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.5.S2083

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title = "Reconstruction of vacuum magnetic flux in QUEST",

abstract = "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.",

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

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doi = "10.1585/pfr.5.S2083",

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journal = "Plasma and Fusion Research",

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T1 - Reconstruction of vacuum magnetic flux in QUEST

AU - Ishiguro, Masaki

AU - Hanada, Kazuaki

AU - Nakamura, Kazuo

AU - Mitarai, Osamu

AU - Zushi, Hideki

AU - Idei, Hiroshi

AU - Sakamoto, Mizuki

AU - Hasegawa, Makoto

AU - Higashizono, Yuta

AU - Takase, Yuichi

AU - Maekawa, Takashi

AU - Kishimoto, Yasuaki

AU - Kawasaki, Shoji

AU - Nakashima, Hisatoshi

AU - Higashijima, Aki

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

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JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

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Reconstruction of vacuum magnetic flux in QUEST

Abstract

All Science Journal Classification (ASJC) codes

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