Beam cavity interaction

Details Beam cavity interaction Beam cavity interaction

2011-12-14

arxiv.org/abs/1112.3203v1

CERN Yellow Report CERN-2011-007, pp. 149-171

Physics

Accelerator Physics

23 pages, contribution to the CAS - CERN Accelerator School: Specialised Course on RF for Accelerators; 8 - 17 Jun 2010, Ebelt

Scientific paper

We begin by giving a description of the rf generator-cavity-beam coupled system in terms of basic quantities. Taking beam loading and cavity detuning into account, expressions for the cavity impedance as seen by the generator and as seen by the beam are derived. Subsequently methods of beam-loading compensation by cavity detuning, rf feedback, and feed-forward are described. Examples of digital rf phase and amplitude control for the special case of superconducting cavities are also given. Finally, a dedicated phase loop for damping synchrotron oscillations is discussed.

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