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In order to minimize the emittance at the Cornell Electron Storage Ring(CESR), we measure and correct the orbit, dispersion, and transverse couplingof the beam. However, this method is limited by finite measurement resolutionof the dispersion, and so a new procedure must be used to further reduce theemittance due to dispersion. In order to achieve this, we use a method basedupon the theory of sloppy models. We use a model of the accelerator to createthe Hessian matrix which encodes the effects of various corrector magnets onthe vertical emittance. A singular value decomposition of this matrix yieldsthe magnet combinations which have the greatest effect on the emittance. We canthen adjust these magnet "knobs" sequentially in order to decrease thedispersion and the emittance. We present here comparisons of the effectivenessof this procedure in both experiment and simulation using a variety of CESRlattices. We also discuss techniques to minimize changes to parameters we havealready corrected.

Using Sloppy Models for Constrained Emittance Minimization at the Cornell Electron Storage Ring (CESR)