Centre-solenoid-free merging start-up of spherical tokamak plasmas in UTST

M. Inomoto; T. G. Watanabe; K. Gi; K. Yamasaki; S. Kamio; R. Imazawa; T. Yamada; X. Guo; T. Ushiki; H. Ishikawa; H. Nakamata; N. Kawakami; T. Sugawara; K. Matsuyama; K. Noma; A. Kuwahata; H. Tanabe

doi:10.1088/0029-5515/55/3/033013

Centre-solenoid-free merging start-up of spherical tokamak plasmas in UTST

M. Inomoto, T. G. Watanabe, K. Gi, K. Yamasaki, S. Kamio, R. Imazawa, T. Yamada, X. Guo, T. Ushiki, H. Ishikawa, H. Nakamata, N. Kawakami, T. Sugawara, K. Matsuyama, K. Noma, A. Kuwahata, H. Tanabe

Division for Experimental Natural Science

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

29 Citations (Scopus)

Abstract

A centre-solenoid-free merging start-up scheme for spherical tokamak plasmas was developed in a University of Tokyo spherical tokamak (UTST) experiment by using outer poloidal field coils. Torus breakdown was initiated at null points and two spherical tokamak plasmas with a total current up to 80kA were generated inductively. Their merging process provided substantial ion and electron heating by magnetic reconnection. The obtained dependence of heating on plasma current suggests that high-temperature and high-current plasma suitable for neutral beam injection is attainable under the realistic conditions in the merging start-up method.

Original language	English
Article number	033013
Journal	Nuclear Fusion
Volume	55
Issue number	3
DOIs	https://doi.org/10.1088/0029-5515/55/3/033013
Publication status	Published - Mar 1 2015

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Inomoto, M., Watanabe, T. G., Gi, K., Yamasaki, K., Kamio, S., Imazawa, R., Yamada, T., Guo, X., Ushiki, T., Ishikawa, H., Nakamata, H., Kawakami, N., Sugawara, T., Matsuyama, K., Noma, K., Kuwahata, A., & Tanabe, H. (2015). Centre-solenoid-free merging start-up of spherical tokamak plasmas in UTST. Nuclear Fusion, 55(3), Article 033013. https://doi.org/10.1088/0029-5515/55/3/033013

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abstract = "A centre-solenoid-free merging start-up scheme for spherical tokamak plasmas was developed in a University of Tokyo spherical tokamak (UTST) experiment by using outer poloidal field coils. Torus breakdown was initiated at null points and two spherical tokamak plasmas with a total current up to 80kA were generated inductively. Their merging process provided substantial ion and electron heating by magnetic reconnection. The obtained dependence of heating on plasma current suggests that high-temperature and high-current plasma suitable for neutral beam injection is attainable under the realistic conditions in the merging start-up method.",

author = "M. Inomoto and Watanabe, {T. G.} and K. Gi and K. Yamasaki and S. Kamio and R. Imazawa and T. Yamada and X. Guo and T. Ushiki and H. Ishikawa and H. Nakamata and N. Kawakami and T. Sugawara and K. Matsuyama and K. Noma and A. Kuwahata and H. Tanabe",

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T1 - Centre-solenoid-free merging start-up of spherical tokamak plasmas in UTST

AU - Inomoto, M.

AU - Watanabe, T. G.

AU - Gi, K.

AU - Yamasaki, K.

AU - Kamio, S.

AU - Imazawa, R.

AU - Yamada, T.

AU - Guo, X.

AU - Ushiki, T.

AU - Ishikawa, H.

AU - Nakamata, H.

AU - Kawakami, N.

AU - Sugawara, T.

AU - Matsuyama, K.

AU - Noma, K.

AU - Kuwahata, A.

AU - Tanabe, H.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - A centre-solenoid-free merging start-up scheme for spherical tokamak plasmas was developed in a University of Tokyo spherical tokamak (UTST) experiment by using outer poloidal field coils. Torus breakdown was initiated at null points and two spherical tokamak plasmas with a total current up to 80kA were generated inductively. Their merging process provided substantial ion and electron heating by magnetic reconnection. The obtained dependence of heating on plasma current suggests that high-temperature and high-current plasma suitable for neutral beam injection is attainable under the realistic conditions in the merging start-up method.

AB - A centre-solenoid-free merging start-up scheme for spherical tokamak plasmas was developed in a University of Tokyo spherical tokamak (UTST) experiment by using outer poloidal field coils. Torus breakdown was initiated at null points and two spherical tokamak plasmas with a total current up to 80kA were generated inductively. Their merging process provided substantial ion and electron heating by magnetic reconnection. The obtained dependence of heating on plasma current suggests that high-temperature and high-current plasma suitable for neutral beam injection is attainable under the realistic conditions in the merging start-up method.

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Centre-solenoid-free merging start-up of spherical tokamak plasmas in UTST

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