### Abstract

The statistical theory of strong turbulence in inhomogeneous plasmas is developed for the cases where fluctuations with different scale lengths coexist. Statistical nonlinear interactions between semimicro and micro modes are first kept in the analysis as the drag, noise and drive. The nonlinear dynamics determines both the fluctuation levels and the cross field turbulent transport for the fixed global parameters. A quenching or suppressing effect is induced by their nonlinear interplay, even if both modes are unstable when analyzed independently. Influence of the inhomogeneous global radial electric field is discussed. A new insight is given for the physics of the internal transport barrier. The thermal fluctuation of the scale length of λ _{D} is assumed to be statistically independent. The hierarchical structure is constructed according to the scale lengths. Transitions in turbulence are found and phase diagrams with cusp type catastrophe are obtained. Dynamics is followed. Statistical properties of the subcritical excitation are discussed. The probability density function (PDF) and transition probability are obtained. Power laws are obtained in the PDF as well as in the transition probability. Generalization for the case where turbulence is composed of three classes of modes is also developed. A new catastrophe of turbulent states is obtained.

Original language | English |
---|---|

Pages (from-to) | 1947-1954 |

Number of pages | 8 |

Journal | Physics of Plasmas |

Volume | 9 |

Issue number | 5 |

DOIs | |

Publication status | Published - May 1 2002 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics

### Cite this

*Physics of Plasmas*,

*9*(5), 1947-1954. https://doi.org/10.1063/1.1455005

**Transition in multiple-scale-lengths turbulence in plasmas.** / Itoh, S. I.; Itoh, K.; Yagi, M.; Kawasaki, M.; Kitazawa, A.

Research output: Contribution to journal › Article

*Physics of Plasmas*, vol. 9, no. 5, pp. 1947-1954. https://doi.org/10.1063/1.1455005

}

TY - JOUR

T1 - Transition in multiple-scale-lengths turbulence in plasmas

AU - Itoh, S. I.

AU - Itoh, K.

AU - Yagi, M.

AU - Kawasaki, M.

AU - Kitazawa, A.

PY - 2002/5/1

Y1 - 2002/5/1

N2 - The statistical theory of strong turbulence in inhomogeneous plasmas is developed for the cases where fluctuations with different scale lengths coexist. Statistical nonlinear interactions between semimicro and micro modes are first kept in the analysis as the drag, noise and drive. The nonlinear dynamics determines both the fluctuation levels and the cross field turbulent transport for the fixed global parameters. A quenching or suppressing effect is induced by their nonlinear interplay, even if both modes are unstable when analyzed independently. Influence of the inhomogeneous global radial electric field is discussed. A new insight is given for the physics of the internal transport barrier. The thermal fluctuation of the scale length of λ D is assumed to be statistically independent. The hierarchical structure is constructed according to the scale lengths. Transitions in turbulence are found and phase diagrams with cusp type catastrophe are obtained. Dynamics is followed. Statistical properties of the subcritical excitation are discussed. The probability density function (PDF) and transition probability are obtained. Power laws are obtained in the PDF as well as in the transition probability. Generalization for the case where turbulence is composed of three classes of modes is also developed. A new catastrophe of turbulent states is obtained.

AB - The statistical theory of strong turbulence in inhomogeneous plasmas is developed for the cases where fluctuations with different scale lengths coexist. Statistical nonlinear interactions between semimicro and micro modes are first kept in the analysis as the drag, noise and drive. The nonlinear dynamics determines both the fluctuation levels and the cross field turbulent transport for the fixed global parameters. A quenching or suppressing effect is induced by their nonlinear interplay, even if both modes are unstable when analyzed independently. Influence of the inhomogeneous global radial electric field is discussed. A new insight is given for the physics of the internal transport barrier. The thermal fluctuation of the scale length of λ D is assumed to be statistically independent. The hierarchical structure is constructed according to the scale lengths. Transitions in turbulence are found and phase diagrams with cusp type catastrophe are obtained. Dynamics is followed. Statistical properties of the subcritical excitation are discussed. The probability density function (PDF) and transition probability are obtained. Power laws are obtained in the PDF as well as in the transition probability. Generalization for the case where turbulence is composed of three classes of modes is also developed. A new catastrophe of turbulent states is obtained.

UR - http://www.scopus.com/inward/record.url?scp=0037548968&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037548968&partnerID=8YFLogxK

U2 - 10.1063/1.1455005

DO - 10.1063/1.1455005

M3 - Article

AN - SCOPUS:0037548968

VL - 9

SP - 1947

EP - 1954

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 5

ER -