Ensemble Reservoir Computing for Dynamical Systems: Prediction of Phase-Space Stable Region for Hadron Storage Rings

TL;DR

This paper demonstrates that ensemble reservoir computing, specifically Echo State Networks, can effectively predict the long-term phase-space stability regions in hadron storage rings, offering a computationally efficient alternative to traditional simulations.

Contribution

The study introduces an ensemble ESN approach for predicting dynamic aperture regions, outperforming analytical scaling laws and serving as an efficient surrogate model.

Findings

ESN ensemble approach accurately predicts phase-space stability.

Outperforms analytical scaling laws in prediction accuracy.

Provides a computationally efficient alternative to simulations.

Abstract

We investigate the ability of an ensemble reservoir computing approach to predict the long-term behaviour of the phase-space region in which the motion of charged particles in hadron storage rings is bounded, the so-called dynamic aperture. Currently, the calculation of the phase-space stability region of hadron storage rings is performed through direct computer simulations, which are resource- and time-intensive processes. Echo State Networks (ESN) are a class of recurrent neural networks that are computationally effective, since they avoid backpropagation and require only cross-validation. Furthermore, they have been proven to be universal approximants of dynamical systems. In this paper, we present the performance reached by ESN based on an ensemble approach for the prediction of the phase-space stability region and compare it with analytical scaling laws based on the stability-time estimate of the Nekhoroshev theorem for Hamiltonian systems. We observe that the proposed ESN approach is capable of effectively predicting the time evolution of the extent of the dynamic aperture, improving the predictions by analytical scaling laws, thus providing an efficient surrogate model.