Controlling dispersive chaos in binary-fluid convection

We report observations of stabilized traveling-wave (TW) convection in a re gime in which the uncontrolled system exhibits repeated, erratic growth and abrupt decay of spatially localized bursts of TW. By applying as feedback a spatially varying Rayleigh-number profile computed from the measured conv ection pattern, we suppress this behavior and stabilize states of unidirect ional TW with spatially uniform amplitude on the unstable branch of the sub critical bifurcation to convection. This allows us to measure the nonlinear coefficients of the corresponding quintic complex Ginzburg-Landau equation .