U.S. Particle Accelerator School

Beam Stability at Light Sources course

Sponsoring University:

University of California, Santa Barbara


Beam Stability at Light Sources


Glen Decker, John Carwardine, Nick Sereno, ANL and Robert Hettel, SLAC

This course will investigate the ever-increasing requirements for photon beam stability and the means to achieve them at synchrotron radiation facilities. The principal types of synchrotron radiation sources, including storage rings, FELs, energy recovery linacs and others, will be reviewed together with their specific photon beam properties. Photon beam stability criteria, and consequent charged particle beam stability needs, will be derived based on the requirements of synchrotron radiation experiments at these facilities. Stability metrics in the time and frequency domains and the diagnostic instrumentation and measurement methods used to quantify stability will be reviewed. Sources of beam instability, including electrical and mechanical elements and collective beam effects, and their disturbance magnitudes will be discussed and quantified. Noise-reducing accelerator component design and various types of beam stabilizing systems and methods, such as orbit and multibunch feedback systems and Landau damping systems, will be explored. Finally, methods to meet the demanding stability needs for near-future light sources and experiments will be probed. Prerequisites: basic understanding of accelerator physics and electromagnetism. Familiarity with spectral analysis, Laplace transforms and electrical engineering concepts, including feedback systems, desirable.