Ion kinetic effect on bifurcated relaxation to a field-reversed configuration in TS-4 CT experiment

E. Kawamori, Y. Murata, K. Umeda, D. Hirota, T. Ogawa, T. Sumikawa, T. Iwama, K. Ishii, T. Kado, T. Itagaki, M. Katsurai, A. Balandin, Y. Ono

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Abstract

The ion kinetic effect on the bifurcated relaxation of merging spheromaks to a field-reversed configuration (FRC) was studied experimentally using varied S*, which is the ratio of the minor radius to the ion skin depth from 1 to 7. The two merging spheromaks were observed to relax to an FRC or a new spheromak depending on whether the initial poloidal eigenvalue was smaller or larger than a threshold value. The threshold initial poloidal eigenvalue for the relaxation to an FRC increased with the decreasing S * value. A decrease in S* promoted the relaxation to an FRC, annihilating the magnetic helicity, in sharp contrast with the conventional Taylor relaxation. Suppression of the low-n mode by the rotation shear of the toroidal modes is the most probable reason why the low-S* condition promotes the relaxation into an FRC.

Original languageEnglish
Pages (from-to)843-848
Number of pages6
JournalNuclear Fusion
Volume45
Issue number8
DOIs
Publication statusPublished - 2005 Aug 1

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Kawamori, E., Murata, Y., Umeda, K., Hirota, D., Ogawa, T., Sumikawa, T., Iwama, T., Ishii, K., Kado, T., Itagaki, T., Katsurai, M., Balandin, A., & Ono, Y. (2005). Ion kinetic effect on bifurcated relaxation to a field-reversed configuration in TS-4 CT experiment. Nuclear Fusion, 45(8), 843-848. https://doi.org/10.1088/0029-5515/45/8/010