An energetic charged particle beam introduced to an rf cavity
excites a wakefield therein. This wakefield can be decomposed into
a series of higher order modes and multipoles, which for
sufficiently small beam offsets are dominated by the dipole
component. This work focuses on using these dipole modes to detect
the beam position in third harmonic superconducting S-band cavities
for light source applications. A rigorous examination of several
means of analysing the beam position based on signals radiated to
higher order modes ports is presented. Experimental results
indicate a position resolution, based on this technique, of 20
microns over a complete module of 4 cavities. Methods are also
indicated for improving the resolution and for applying this method
to other cavity configurations. This work is distinguished by its
clarity and potential for application to several other
international facilities. The material is presented in a didactic
style and is recommended both for students new to the field, and
for scientists well-versed in the field of rf diagnostics.
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