Observation of long-distance radial correlation in toroidal plasma turbulence |
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Authors: | 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 Yamada H Komori A;LHD Experiment Group |
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Institution: | Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan. |
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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 ~1-3 kHz, 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. |
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