TY - JOUR
T1 - Anatomy of plasma turbulence
AU - Yamada, Takuma
AU - Itoh, Sanae I.
AU - Maruta, Takashi
AU - Kasuya, Naohiro
AU - Nagashima, Yoshihiko
AU - Shinohara, Shunjiro
AU - Terasaka, Kenichiro
AU - Yagi, Masatoshi
AU - Inagaki, Shigeru
AU - Kawai, Yoshinobu
AU - Fujisawa, Akihide
AU - Itoh, Kimitaka
N1 - Funding Information:
We are grateful to P. H. Diamond, A. Fukuyama and G. R. Tynan for useful discussions, and F. Greiner and M. Kawaguchi for support in the experimental work. This work was supported by Grant-in-Aid for Specially-Promoted Research of MEXT, Japan (16002005) (Itoh project), Grant-in-Aid for Young Scientists (B) of JSPS, Japan (19760597), the collaboration programmes of the National Institute for Fusion Science (NIFS07KOAP017) and RIAM, Kyushu University and Asada Eiichi Research Foundation.
PY - 2008/9
Y1 - 2008/9
N2 - Turbulence is a state of fluids and plasma where nonlinear interactions including cascades to finer scales take place to generate chaotic structure and dynamics. However, turbulence could generate global structures, such as dynamo magnetic field, zonal flows, transport barriers, enhanced transport and quenching transport. Therefore, in turbulence, multiscale phenomena coevolve in space and time, and the character of plasma turbulence has been investigated in the laboratory as a modern and historical scientific mystery. Here, we report anatomical features of the plasma turbulence in the wavenumber-frequency domain by using nonlinear spectral analysis including the bi-spectrum. First, the formation of the plasma turbulence can be regarded as a result of nonlinear interaction of a small number of irreducible parent modes that satisfy the linear dispersion relation. Second, the highlighted finding here, is the first identification of a streamer (state of bunching of drift waves) that should degrade the quality of plasmas for magnetic confinement fusion. The streamer is a poloidally localized, radially elongated global structure that lives longer than the characteristic turbulence correlation time, and our results reveal that the streamer is produced as the result of the nonlinear condensation, or nonlinear phase locking of the major triplet modes.
AB - Turbulence is a state of fluids and plasma where nonlinear interactions including cascades to finer scales take place to generate chaotic structure and dynamics. However, turbulence could generate global structures, such as dynamo magnetic field, zonal flows, transport barriers, enhanced transport and quenching transport. Therefore, in turbulence, multiscale phenomena coevolve in space and time, and the character of plasma turbulence has been investigated in the laboratory as a modern and historical scientific mystery. Here, we report anatomical features of the plasma turbulence in the wavenumber-frequency domain by using nonlinear spectral analysis including the bi-spectrum. First, the formation of the plasma turbulence can be regarded as a result of nonlinear interaction of a small number of irreducible parent modes that satisfy the linear dispersion relation. Second, the highlighted finding here, is the first identification of a streamer (state of bunching of drift waves) that should degrade the quality of plasmas for magnetic confinement fusion. The streamer is a poloidally localized, radially elongated global structure that lives longer than the characteristic turbulence correlation time, and our results reveal that the streamer is produced as the result of the nonlinear condensation, or nonlinear phase locking of the major triplet modes.
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U2 - 10.1038/nphys1029
DO - 10.1038/nphys1029
M3 - Article
AN - SCOPUS:51049114012
SN - 1745-2473
VL - 4
SP - 721
EP - 725
JO - Nature Physics
JF - Nature Physics
IS - 9
ER -