Observation of long-distance radial correlation in toroidal plasma turbulence

S. Inagaki, T. Tokuzawa, K. Itoh, K. Ida, S. I. Itoh, N. Tamura, S. Sakakibara, N. Kasuya, A. Fujisawa, S. Kubo, T. Shimozuma, T. Ido, S. Nishimura, H. Arakawa, T. Kobayashi, K. Tanaka, Y. Nagayama, K. Kawahata, S. Sudo, H. YamadaA. Komori

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Abstract

This Letter presents the discovery of macroscale electron temperature fluctuations with a long radial correlation length comparable to the plasma minor radius in a toroidal plasma. Their spatiotemporal structure is characterized by a low frequency of ∼1-3kHz, ballistic radial propagation, a poloidal or toroidal mode number of m/n=1/1 (or 2/1), and an amplitude of ∼2% at maximum. Nonlinear coupling between the long-range fluctuations and the microscopic fluctuations is identified. A change of the amplitude of the long-range fluctuation is transmitted across the plasma radius at the velocity which is of the order of the drift velocity.

Original languageEnglish
Article number115001
JournalPhysical review letters
Volume107
Issue number11
DOIs
Publication statusPublished - Sep 7 2011

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Inagaki, S., Tokuzawa, T., Itoh, K., Ida, K., Itoh, S. I., Tamura, N., Sakakibara, S., Kasuya, N., Fujisawa, A., Kubo, S., Shimozuma, T., Ido, T., Nishimura, S., Arakawa, H., Kobayashi, T., Tanaka, K., Nagayama, Y., Kawahata, K., Sudo, S., ... Komori, A. (2011). Observation of long-distance radial correlation in toroidal plasma turbulence. Physical review letters, 107(11), [115001]. https://doi.org/10.1103/PhysRevLett.107.115001