Effect of ion skin depth on relaxation of merging spheromaks to a field-reversed configuration

Eiichirou Kawamori, Yasushi Ono

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The effect of ion skin depth on the relaxation of merging spheromaks to a field-reversed configuration (FRC) is studied experimentally for a wide range of size parameter S* (ratio of minor radius to ion skin depth) from 1 to 7. The two merging spheromaks are observed to relax to an FRC or a new spheromak depending on whether the initial poloidal eigenvalue is smaller or larger than a threshold value. The bifurcation value is found to increase with decreasing size parameter S*, indicating that the low-S* condition provides a wide bifurcated range of relaxation to an FRC. The FRC-style relaxation under the low-S* conditions was accompanied by the suppression of the low-n modes (n is the toroidal mode number) activity. The fast rotations of the modes were followed by suppression of the low-n modes.

Original languageEnglish
Article number085003
JournalPhysical review letters
Volume95
Issue number8
DOIs
Publication statusPublished - 2005 Aug 19

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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