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Analogous saturation mechanisms of the ion and electron temperature gradient drift wave turbulence
1Plasma Research Laboratory, Columbia University, New York, New York 10027, USA.
Abstract:
New experimental results and theoretical arguments indicate that a novel saturation mechanism of the electron temperature gradient modes is related to its coupling to a damped ion acoustic mode. The experimental bicoherence data show multimode coupling between two high frequency radial harmonics of electron temperature gradient in the vicinity of (∼2 MHz) and one low frequency ion acoustic (∼45 kHz) mode. A unique feedback diagnostic also verifies this coupling. It is pointed out that a near identical mechanism is responsible for ITG mode saturation [V. Sokolov, and A. K. Sen, Phys. Rev. Lett. 92, 165002 (2004)], indicating its plausible generic nature.
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