Geodesic Acoustic Mode Spectroscopy II

• ITOH Sanae-I.

  Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

• NISHIMURA Seiya

  National Institute for Fusion Science, Toki 509-5292, Japan

• ITOH Kimitaka

  National Institute for Fusion Science, Toki 509-5292, Japan

• FUJISAWA Akihide

  National Institute for Fusion Science, Toki 509-5292, Japan

• NAGASHIMA Yoshihiko

  Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan

• INAGAKI Shigeru

  Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

Abstract

An extension of geodesic acoustic mode (GAM) spectroscopy [Plasma Phys. Control. Fusion 49, L7 (2007)] is proposed. The ratio between the lowest frequency of the co-existing ion acoustic mode (IAM) and the frequency of GAM enables us to identify the safety factor of toroidal plasmas. The lowest frequency can be detected by bispectrum analysis when both GAM and IAM are excited. The possibility of measuring the safety factor is discussed.

Journal

• Plasma and Fusion Research

  Plasma and Fusion Research 4 014-014, 2009

  The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

• geodesic acoustic mode
• ion acoustic mode
• toroidal plasma
• safety factor
• new diagnostics
• bicoherence

Details

• CRID: 1390001205253275648
• NII Article ID: 130000138152
• DOI: 10.1585/pfr.4.014
• ISSN: 18806821
• Web Site: http://www.jstage.jst.go.jp/article/pfr/4/0/4_0_014/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed