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Author(s):
S-I. Itoh and K. Itoh
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Title:
Transition in Multiple-scale-lengthsTurbulence in Plasmas
Date of publication:
May 2001
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Key words:
plasma turbulence, multiple scale lengths, turbulence transition, internal transport barrier, extended fluctuation-dissipation theorem, cusp type catastrophe, phase diagram, radial electric field
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Abstract:
Statistical theory of strong turbulence in inhomogeneous plasmas is extended to the state where fluctuations with different scale lengths, micro and semi-micro modes, coexist. Their nonlinear interactions give several states of turbulence: in one state, the micro mode is excited while the semi-micro mode is quenched; in another state, the latter is excited while the micro mode is suppressed. A new turbulence transition with a hard bifurcation was obtained. A phase diagram was obtained. A new insight is given for the physics of internal transport barrier.
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