A new and convenient method to experimentally determine nonlinear dynamical models of plasma turbulence is described. It is based on a novel use of feedback control which generates information about the model without introducing additional unknowns. The method is applied to an E×B turbulence in the Columbia Linear Machine to determine the linear eigenfrequencies and nonlinear coupling coefficients of a three wave coupling model directly from experimental data.
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Chiu et al. (1999) studied this question.
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