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Abstract:
Higher Order Modes (HOMs) can severely limit the operation
of superconducting cavities in a linac with high beam current, high duty factor and complex pulse structure.
The full HOM spectrum has to be analyzed in order to identify potentially dangerous modes already during the
design phase and to define their damping requirements. For
this purpose a dedicated beam simulation code focused on
beam-HOMinteraction was developed, taking into account important effects like the HOMfrequency spread, beam input
jitter, different chopping patterns, as well as klystron
and alignment errors. Here, the code is used to investigate
in detail the HOM properties of the cavities foreseen
in the Superconducting Proton Linac (SPL) at CERN and
their potential to drive beam instabilities. Special attention is given to HOM excitation by chopped pulses with high repetition rate.
