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

## TL;DR

This paper introduces a novel approach using sloppy models and Hessian analysis to optimize magnet adjustments for reducing beam emittance at CESR, surpassing traditional measurement limitations.

## Contribution

It applies the theory of sloppy models and Hessian analysis to improve emittance minimization in particle accelerators, providing a new method for optimizing magnet settings.

## Key findings

- Effective reduction of emittance demonstrated in experiments.
- Simulation results confirm the method's robustness.
- Techniques to preserve corrected parameters are discussed.

## Abstract

In order to minimize the emittance at the Cornell Electron Storage Ring (CESR), we measure and correct the orbit, dispersion, and transverse coupling of the beam. However, this method is limited by finite measurement resolution of the dispersion, and so a new procedure must be used to further reduce the emittance due to dispersion. In order to achieve this, we use a method based upon the theory of sloppy models. We use a model of the accelerator to create the Hessian matrix which encodes the effects of various corrector magnets on the vertical emittance. A singular value decomposition of this matrix yields the magnet combinations which have the greatest effect on the emittance. We can then adjust these magnet "knobs" sequentially in order to decrease the dispersion and the emittance. We present here comparisons of the effectiveness of this procedure in both experiment and simulation using a variety of CESR lattices. We also discuss techniques to minimize changes to parameters we have already corrected.