Simulation of the transit-time optical stochastic cooling process in the Cornell Electron Storage Ring

TL;DR

This paper presents a particle tracking simulation to analyze optical stochastic cooling in CESR, focusing on beam dynamics, cooling rates, and the influence of bypass optics on emittance reduction.

Contribution

It introduces a detailed simulation framework for optical stochastic cooling, exploring the effects of bypass optics on cooling efficiency and beam parameters.

Findings

Cooling rates depend on bunch and lattice parameters.

Optics with different emittance and momentum acceptance affect cooling performance.

The bypass layout influences the coupling of betatron amplitude and momentum offset.

Abstract

In preparation for a demonstration of optical stochastic cooling in the Cornell Electron Storage Ring (CESR) we have developed a particle tracking simulation to study the relevant beam dynamics. Optical radiation emitted in the pickup undulator gives a momentum kick to that same particle in the kicker undulator. The optics of the electron bypass from pickup to kicker couples betatron amplitude and momentum offset to path length so that the momentum kick reduces emittance and momentum spread. Nearby electrons contribute an incoherent noise. Layout of the bypass line is presented that accommodates optics with a range of transverse and longitudinal cooling parameters. The simulation is used to determine cooling rates and their dependence on bunch and lattice parameters for bypass optics with distinct emittance and momentum acceptance.