title: Spatiotemporal mode structure of nonlinearly coupled drift wave modes.
abstract: This paper presents full cross-section measurements of drift waves in the linear magnetized plasma of the Mirabelle device. Drift wave modes are studied in regimes of weakly developed turbulence. The drift wave modes develop azimuthal space-time structures of plasma density, plasma potential, and visible light fluctuations. A fast camera diagnostic is used to record visible light fluctuations of the plasma column in an azimuthal cross section with a temporal resolution of 10 μs corresponding approximately to 10% of the typical drift wave period. Mode coupling and drift wave dispersion are studied by spatiotemporal Fourier decomposition of the camera frames. The observed coupling between modes is compared to calculations of nonlinearly coupled oscillators described by the Kuramoto model.
authors.affiliation: Max-Planck-Institut für Plasmaphysik, Greifswald, Germany. christian.brandt@ipp.mpg.de
authors.forename: Christian
authors.initials: C
authors.lastname: Brandt
authors.forename: Olaf
authors.initials: O
authors.lastname: Grulke
authors.forename: Thomas
authors.initials: T
authors.lastname: Klinger
authors.forename: José
authors.initials: J
authors.lastname: Negrete
authors.forename: Guillaume
authors.initials: G
authors.lastname: Bousselin
authors.forename: Frédéric
authors.initials: F
authors.lastname: Brochard
authors.forename: Gérard
authors.initials: G
authors.lastname: Bonhomme
authors.forename: Stella
authors.initials: S
authors.lastname: Oldenbürger