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|Paper IPM / Particles And Accelerator / 15640||
The Linac4 accelerator includes 24 electromagnetic quadrupoles characterized by very fast excitation cycles and narrow apertures which make accurate magnetic measurements challenging. This note describes first the method used for the testing, that is a combination of techniques based on stretched wire system plus 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 of these quadrupoles, such as the impact of hysteresis cycling and of dynamic eddy current effects. We then summarize the results of the series test campaign, which include field strength, quality, and the offset and orientation of the magnetic axis.
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