Geodesic acoustic mode spectroscopy

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

Research output: Contribution to journalArticle

38 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 (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.

Original languageEnglish
Article numberL01
Pages (from-to)L7-L10
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number8
DOIs
Publication statusPublished - Aug 1 2007

Fingerprint

Spectroscopy
acoustics
Ions
spectroscopy
Plasma diagnostics
ions
toroidal plasmas
plasma diagnostics
Acoustic wave velocity
acoustic velocity
Thermal gradients
temperature gradients
Plasmas
Wavelength
radii
Chemical analysis
wavelengths
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Geodesic acoustic mode spectroscopy. / Itoh, S. I.; Itoh, K.; Sasaki, M.; Fujisawa, A.; Ido, T.; Nagashima, Y.

In: Plasma Physics and Controlled Fusion, Vol. 49, No. 8, L01, 01.08.2007, p. L7-L10.

Research output: Contribution to journalArticle

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