Multipactoring Zone Map of an RF Input Coupler
and its Application to High Beam Current Storage Rings
Multipactoring phenomena in a radio-frequency (RF) input coupler,
which could cause serious problems during accelerator operation,
are described based on electrodynamics
with the superposition state of the input and reflected waves
in the coupler.
Since the reflection coefficient varies widely with the beam loading
in the case of high beam current storage rings,
multipactoring zones should be represented
in the two-dimensional space
of the input RF power and the reflection coefficient.
Based on this map,
we have
performed a simulation study for normal-conducting RF accelerating cavities
and developed a method to operate an RF cavity with multipactoring problems
so as to minimize the influence of multipactoring.
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