Magnetic analysis of ohmic discharges in the superconducting tokamak TRIAM-1M

M. Abe, H. Fukumoto, K. Takeuchi, M. Shimizu, M. Otsuka, K. Yoshioka, S. Moriyama, Eriko Jotaki, Kazuo Nakamura, Sanae Itoh

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Abstract

A magnetic analysis to determine the plasma cross-sectional shape and equilibrium parameters in the superconducting tokamak TRIAM-1M is discussed using magnetic data obtained in ohmic discharges. First, it is shown that the eddy currents in the tokamak structures should be taken into account. Two magnetic analysis codes are applied. One is the SHP code in which the plasma current is replaced by several filamental loop currents and the other is the FITEQ code in which the plasma current density is consistent with the MHD equilibrium. The magnetic fields due to eddy currents are expanded into multipole fields. The central safety factor q(0) is fixed at 1.0. The eddy currents reduce the vertical field by 10%. Taking account of them, the accuracy of the magnetic analysis is improved and estimation of the stored thermal energy in a plasma becomes possible. The SHP code has the difficulty that the local plasma surface position can be distorted by the eddy current magnetic field. In addition, it is also noted that the pressure profile analysed by the FITEQ code is consistent with the Thomson scattering measurement and that the energy confinement characteristics are consistent with the neo-Alcator scaling.

Original languageEnglish
Pages (from-to)405-419
Number of pages15
JournalNuclear Fusion
Volume36
Issue number4
DOIs
Publication statusPublished - Apr 1 1996

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eddy currents
plasma currents
safety factors
Thomson scattering
thermal energy
magnetic fields
multipoles
current density
scaling
profiles
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Abe, M., Fukumoto, H., Takeuchi, K., Shimizu, M., Otsuka, M., Yoshioka, K., ... Itoh, S. (1996). Magnetic analysis of ohmic discharges in the superconducting tokamak TRIAM-1M. Nuclear Fusion, 36(4), 405-419. https://doi.org/10.1088/0029-5515/36/4/I01

Magnetic analysis of ohmic discharges in the superconducting tokamak TRIAM-1M. / Abe, M.; Fukumoto, H.; Takeuchi, K.; Shimizu, M.; Otsuka, M.; Yoshioka, K.; Moriyama, S.; Jotaki, Eriko; Nakamura, Kazuo; Itoh, Sanae.

In: Nuclear Fusion, Vol. 36, No. 4, 01.04.1996, p. 405-419.

Research output: Contribution to journalArticle

Abe, M, Fukumoto, H, Takeuchi, K, Shimizu, M, Otsuka, M, Yoshioka, K, Moriyama, S, Jotaki, E, Nakamura, K & Itoh, S 1996, 'Magnetic analysis of ohmic discharges in the superconducting tokamak TRIAM-1M', Nuclear Fusion, vol. 36, no. 4, pp. 405-419. https://doi.org/10.1088/0029-5515/36/4/I01
Abe M, Fukumoto H, Takeuchi K, Shimizu M, Otsuka M, Yoshioka K et al. Magnetic analysis of ohmic discharges in the superconducting tokamak TRIAM-1M. Nuclear Fusion. 1996 Apr 1;36(4):405-419. https://doi.org/10.1088/0029-5515/36/4/I01
Abe, M. ; Fukumoto, H. ; Takeuchi, K. ; Shimizu, M. ; Otsuka, M. ; Yoshioka, K. ; Moriyama, S. ; Jotaki, Eriko ; Nakamura, Kazuo ; Itoh, Sanae. / Magnetic analysis of ohmic discharges in the superconducting tokamak TRIAM-1M. In: Nuclear Fusion. 1996 ; Vol. 36, No. 4. pp. 405-419.
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