Ideas for fast accelerator model calibration

With the advent of a simple matrix inversion technique, measurement-based storage ring modeling has made rapid progress in recent years. Using fast computers with large memory, the matrix inversion procedure typically adjusts up to 10³ model variables to fit the order of 10⁵ measurements. The results have been surprisingly accurate. Physics aside, one of the next frontiers is to simplify the process and to reduce computation time. In this paper, we discuss two approaches to speed up the model calibration process: recursive least-squares fitting and a piecewise fitting approach