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A quadrupole pick-up is sensitive to the quantity σ2x -
σ2y, where σx and σy are the horizontal and vertical
r.m.s. beam sizes. Since it is a non-invasive device, it is potentially
very useful for matching and emittance measurements. A magnetic
quadrupole pick-up has been developed for the CERN PS. By coupling to the
radial component of the magnetic field around the beam, it was possible
to eliminate the common-mode problem, which is usually a limiting factor
in the use of quadrupole pick-ups. This paper presents the final pick-up
design, which is the result of a series of simulations and test
prototypes. The performance of the pick-up and its associated electronics
is discussed. Preliminary results from the two pick-ups recently
installed in the PS machine are also presented.
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