“School of Particles”
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| Paper IPM / Particles / 13718 |
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| Abstract: | |||||||||||||||
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Linac4, currently being built at CERN, includes 24
quadrupole magnets characterized by narrow apertures
and fast excitation cycles which make accurate
magnetic measurements challenging. This paper
describes the method used for the measurement, which
is a combination of techniques based on stretched wire,
rotating and fixed search coils. We show how these
different instruments can be used in a complementary
way to derive information on different aspects of the
magnetic behaviour, such as the impact of hysteresis
and dynamic eddy current effects. We summarize the
results of the series measurement campaign, which
include field strength, harmonic components, and the
offset and orientation of the magnetic axis. Finally, we
discuss the relevance of these measurements as their
impact to the operation of the linac.
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