Experimental evidence of a zonal magnetic field in a toroidal plasma |
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Authors: | Fujisawa A Itoh K Shimizu A Nakano H Ohshima S Iguchi H Matsuoka K Okamura S Minami T Yoshimura Y Nagaoka K Ida K Toi K Takahashi C Kojima M Nishimura S Isobe M Suzuki C Akiyama T Nagashima Y Itoh S-I Diamond P H |
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Institution: | National Institute for Fusion Science, Oroshi-cho, Toki-shi 509-52, Japan. |
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Abstract: | A zonal magnetic field is found in a toroidal plasma. The magnetic field has a symmetric bandlike structure, which is uniform in the toroidal and poloidal directions and varies radially with a finite wavelength of mesoscale, which is analogous to zonal flows. A time-dependent bicoherence analysis reveals that the magnetic field should be generated by the background plasma turbulence. The discovery is classified as a new kind of phenomenon of structured magnetic field generation, giving insight into phenomena such as dipole field generation in rotational planets. |
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