Coherent Synchrotron Radiation in Whispering Gallery Modes: Theory and Evidence

TL;DR

This paper explores the theoretical prediction and experimental evidence of Coherent Synchrotron Radiation occurring in whispering gallery modes within electron storage rings, highlighting high-frequency resonances and their effects on beam dynamics.

Contribution

It provides a comprehensive analysis combining theory and experimental data on CSR in whispering gallery modes, a phenomenon not thoroughly characterized before.

Findings

Identification of sharp spectral peaks in CSR

Evidence of long-range wake fields affecting bunch communication

Confirmation of whispering gallery mode resonances in experiments

Abstract

Theory predicts that Coherent Synchrotron Radiation (CSR) in electron storage rings should appear in whispering gallery modes. In an idealized model these are resonances of the vacuum chamber that are characterized by their high frequencies and concentration of the field near the outer wall of the chamber. The resonant modes imply a series of sharp peaks in the frequency spectrum of CSR, and very long wake fields which lead to interbunch communication. Theory and experimental evidence for this behavior will be reviewed.