Geodesic Acoustic Mode Spectroscopy II

Sanae-I. ITOH; Seiya NISHIMURA; Kimitaka ITOH; Akihide FUJISAWA; Yoshihiko NAGASHIMA; Shigeru INAGAKI

doi:10.1585/pfr.4.014

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Geodesic Acoustic Mode Spectroscopy II

Sanae-I. ITOH, Seiya NISHIMURA, Kimitaka ITOH, Akihide FUJISAWA, Yoshihiko NAGASHIMA, Shigeru INAGAKI

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Keywords: geodesic acoustic mode, ion acoustic mode, toroidal plasma, safety factor, new diagnostics, bicoherence

JOURNAL FREE ACCESS

2009 Volume 4 Pages 014

DOI https://doi.org/10.1585/pfr.4.014

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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.

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