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Several theoretical and experimental techniques have been developed in recent years to correct the detrimental effect of nonlinear resonances on dynamic aperture, beam lifetime, injection efficiency and beam loss distribution. These issues are equally important in synchrotron light sources and high energy colliders. We present the latest theoretical and experimental results obtained at the Diamond light source on the characterization of the nonlinear resonances and on the comparison between the nonlinear model of the machine to the real accelerator.
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