Geodesic acoustic mode spectroscopy

S. I. Itoh; K. Itoh; M. Sasaki; A. Fujisawa; T. Ido; Y. Nagashima

doi:10.1088/0741-3335/49/8/L01

Geodesic acoustic mode spectroscopy

S. I. Itoh, K. Itoh, M. Sasaki, A. Fujisawa, T. Ido, Y. Nagashima

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

A new kind of plasma diagnostics, geodesic acoustic mode (GAM) spectroscopy, is proposed. Radial eigenmodes of GAMs with discrete eigenfrequencies in toroidal plasmas are analysed. The eigenmode has a wavelength of the order of (ρ_i the ion gyroradius, L_T the temperature gradient scale length) and has the highest peak near the radius where the eigenfrequency coincides with the local GAM frequency. Therefore, observing the radial position of the highest peak of the eigenmode provides a method to measure the local ion sound velocity. A novel method to measure the ion composition is given, combined with densities and temperatures.

Original language	English
Article number	L01
Pages (from-to)	L7-L10
Journal	Plasma Physics and Controlled Fusion
Volume	49
Issue number	8
DOIs	https://doi.org/10.1088/0741-3335/49/8/L01
Publication status	Published - Aug 1 2007

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/49/8/L01

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T1 - Geodesic acoustic mode spectroscopy

AU - Itoh, S. I.

AU - Itoh, K.

AU - Sasaki, M.

AU - Fujisawa, A.

AU - Ido, T.

AU - Nagashima, Y.

PY - 2007/8/1

Y1 - 2007/8/1

N2 - A new kind of plasma diagnostics, geodesic acoustic mode (GAM) spectroscopy, is proposed. Radial eigenmodes of GAMs with discrete eigenfrequencies in toroidal plasmas are analysed. The eigenmode has a wavelength of the order of (ρi the ion gyroradius, LT the temperature gradient scale length) and has the highest peak near the radius where the eigenfrequency coincides with the local GAM frequency. Therefore, observing the radial position of the highest peak of the eigenmode provides a method to measure the local ion sound velocity. A novel method to measure the ion composition is given, combined with densities and temperatures.

AB - A new kind of plasma diagnostics, geodesic acoustic mode (GAM) spectroscopy, is proposed. Radial eigenmodes of GAMs with discrete eigenfrequencies in toroidal plasmas are analysed. The eigenmode has a wavelength of the order of (ρi the ion gyroradius, LT the temperature gradient scale length) and has the highest peak near the radius where the eigenfrequency coincides with the local GAM frequency. Therefore, observing the radial position of the highest peak of the eigenmode provides a method to measure the local ion sound velocity. A novel method to measure the ion composition is given, combined with densities and temperatures.

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JO - Plasma Physics and Controlled Fusion

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Geodesic acoustic mode spectroscopy

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