Electron Cloud Simulations In The Fermilab Recycler

TL;DR

This paper uses advanced electron cloud simulations to analyze stability thresholds in Fermilab's Recycler, focusing on secondary emission effects and their impact on beam stability.

Contribution

It integrates the Furman-Pivi model into PyECLOUD to improve understanding of electron cloud-induced instabilities in the Recycler.

Findings

Identified stability thresholds for various beam parameters

Enhanced simulation accuracy with the Furman-Pivi model

Provided insights into electron cloud effects on beam stability

Abstract

We present a simulation study to characterize the stability region of the Fermilab (FNAL) Recycler in the context of secondary emission yield (SEY). Interactions between electrons and beam pipe material can produce electron clouds that jeopardize beam stability in certain focusing configurations. Such an instability was documented in the Recycler, and the work presented here reflects improvements to better understand that finding. We incorporated the Furman-Pivi Model into a PyECLOUD analysis, and we determined the instability threshold given various bunch lengths, intensities, SEY magnitudes, and model parameters.