“School of Particles”
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| Paper IPM / Particles / 13719 |
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Two rotating coil shafts with a challenging
small diameter of 8 and 19 mm, originally developed at
CERN for the measurement of linear accelerator magnets,
have been used to quantify the magnetic field strength, the
harmonic content and the field direction of series
quadrupoles for the Swiss Free Electron Laser in
construction at the Paul Scherrer Institute. In this paper, we describe the design and construction of these coils, the
procedure used for their calibration, and the results obtained on the magnets tested so far. We focus especially on the manufacturing and calibration difficulties related to the very small diameter of these coils, which makes it challenging to obtain relative errors at the level of a few 10-4 as it is commonly required by accelerator beam optics. The last part of the paper is dedicated to a selection of measurement results obtained on Swiss Free Electron Laser quadrupoles to illustrate the performance of the two types of coils on series measurements
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