### Abstract

Two examples of non-perturbative models of intermittency in drift-wave (DW) turbulence are presented. The first is a calculation of the probability distribution function (PDF) of ion heat flux due to structures in ion temperature gradient turbulence. The instanton calculus predicts the PDF to be a stretched exponential. The second is a derivation of a bi-variate Burgers equation for the evolution of the DW population density in the presence of radially extended streamer flows. The PDF of fluctuation intensity avalanches is determined. The relation of this to turbulence spreading, observed in simulations, is discussed.

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

Pages (from-to) | 961-968 |

Number of pages | 8 |

Journal | Nuclear Fusion |

Volume | 43 |

Issue number | 9 |

DOIs | |

Publication status | Published - Sep 1 2003 |

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### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics
- Condensed Matter Physics

### Cite this

*Nuclear Fusion*,

*43*(9), 961-968. https://doi.org/10.1088/0029-5515/43/9/321

**Non-perturbative models of intermittency in drift-wave turbulence : Towards a probabilistic theory of anomalous transport.** / Kim, Eun Jin; Diamond, P. H.; Malkov, M.; Hahm, T. S.; Itoh, K.; Itoh, S. I.; Champeaux, S.; Gruzinov, I.; Gurcan, O.; Holland, C.; Rosenbluth, M. N.; Smolyakov, A.

Research output: Contribution to journal › Article

*Nuclear Fusion*, vol. 43, no. 9, pp. 961-968. https://doi.org/10.1088/0029-5515/43/9/321

}

TY - JOUR

T1 - Non-perturbative models of intermittency in drift-wave turbulence

T2 - Towards a probabilistic theory of anomalous transport

AU - Kim, Eun Jin

AU - Diamond, P. H.

AU - Malkov, M.

AU - Hahm, T. S.

AU - Itoh, K.

AU - Itoh, S. I.

AU - Champeaux, S.

AU - Gruzinov, I.

AU - Gurcan, O.

AU - Holland, C.

AU - Rosenbluth, M. N.

AU - Smolyakov, A.

PY - 2003/9/1

Y1 - 2003/9/1

N2 - Two examples of non-perturbative models of intermittency in drift-wave (DW) turbulence are presented. The first is a calculation of the probability distribution function (PDF) of ion heat flux due to structures in ion temperature gradient turbulence. The instanton calculus predicts the PDF to be a stretched exponential. The second is a derivation of a bi-variate Burgers equation for the evolution of the DW population density in the presence of radially extended streamer flows. The PDF of fluctuation intensity avalanches is determined. The relation of this to turbulence spreading, observed in simulations, is discussed.

AB - Two examples of non-perturbative models of intermittency in drift-wave (DW) turbulence are presented. The first is a calculation of the probability distribution function (PDF) of ion heat flux due to structures in ion temperature gradient turbulence. The instanton calculus predicts the PDF to be a stretched exponential. The second is a derivation of a bi-variate Burgers equation for the evolution of the DW population density in the presence of radially extended streamer flows. The PDF of fluctuation intensity avalanches is determined. The relation of this to turbulence spreading, observed in simulations, is discussed.

UR - http://www.scopus.com/inward/record.url?scp=0141508033&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0141508033&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/43/9/321

DO - 10.1088/0029-5515/43/9/321

M3 - Article

AN - SCOPUS:0141508033

VL - 43

SP - 961

EP - 968

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 9

ER -