Abstract
Harmonic cavities have been used in storage rings to increase beam lifetime and Landau damping by lengthening the bunch.The need for lifetime increase is particularly great in the present generation of low to medium energy synchrotron light sources where the small transverse beam sizes lead to relatively short lifetimes from large-angle intrabeam (Touschek) scattering. We review the beam dynamics of harmonic radiofrequency (RF) systems and discuss optimization of the beam lifetime using passive harmonic cavities.
Highlights
To a user of synchrotron radiation, the beam lifetime is one of the most important aspects of a synchrotron light source
The need for lifetime increase is great in the present generation of low to medium energy synchrotron light sources where the small transverse beam sizes lead to relatively short lifetimes from large-angle intrabeam (Touschek) scattering
This process is important for storage rings such as the Advanced Light Source (ALS) because of the high density of electrons resulting from the small transverse beam size
Summary
Given a Gaussian energy spread, the resulting longitudinal distribution is Gaussian If another voltage is added to the main rf voltage with an amplitude and phase such that the slope at the bunch center is zero, the energy distribution is unaffected but the bunch lengthens and the peak charge density decreases and the lifetime improves. This mode of operation may be of interest to some users where lifetime is a secondary concern
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