Beam Induced Electron Cloud Resonances in Dipole Magnetic Fields

Abstract

The buildup of low energy electrons in an accelerator, known as electron cloud, can be severely detrimental to machine performance. Under certain beam conditions, the beam can become resonant with the cloud dynamics, accelerating the buildup of electrons. This paper will examine two such effects: multipacting resonances, in which the cloud development time is resonant with the bunch spacing, and cyclotron resonances, in which the cyclotron period of electrons in a magnetic field is a multiple of bunch spacing. Both resonances have been studied directly in dipole fields using retarding field analyzers installed in the Cornell Electron Storage Ring (CESR). These measurements are supported by both analytical models and computer simulations.

References in corpus (5)

• The Conversion of CESR to Operate as the Test Accelerator, CesrTA, Part 1: Overview
• Comparison of Electron Cloud Mitigating Coatings Using Retarding Field Analyzers
• Measurements of Electron Cloud Growth and Mitigation in Dipole, Quadrupole, and Wiggler Magnets
• Investigation into electron cloud effects in the International Linear Collider positron damping ring
• Measurement and Modeling of Electron Cloud in a Field Free Environment Using Retarding Field Analyzers

Cited by in corpus (1)

• Measurement Techniques for Low Emittance Tuning and Beam Dynamics at CESR