Formation of visco-dissipative vortex and quasi-neutrality breaking in a magnetoplasma

M. Y. Tanaka, K. Nagaoka, Atsushi Okamoto, S. Yoshimura, M. Kono

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

A monopole vortex with a density cavity in its core has been observed in a cylindrical magnetized plasma. It looks like an eye of a typhoon and is called "plasma hole". Velocity field measurement revealed that there exists a radially converging flow and the vorticity distribution is localized in the central hole region. This vorticity localization is identified as a Burgers vortex, which is intrinsic in viscous fluids and has never been observed in a plasma. The effective viscosity of the hole plasma determined by the characteristic scale length of the vorticity localization exhibits an extremely large value compared with the classical one. Potential measurements also revealed that the degree of non-neutrality is three orders of magnitude higher than that without the plasma hole. This result strongly suggests a correlation between the viscosity anomaly and the quasi-neutrality breaking.

Original languageEnglish
Pages (from-to)49-53
Number of pages5
JournalPhysica Scripta T
VolumeT107
DOIs
Publication statusPublished - 2004 Dec 1
EventInternational Topical Conference on Plasma Physics: Complex Plasmas in the New Millennium - Santorini Island, Greece
Duration: 2003 Sep 82003 Sep 12

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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