Abstract
Rotating-coil magnetometers are among the most common transducers for measuring local and integral magnetic fields of accelerator magnets. The measurement uncertainty strongly depends on the mechanical properties of the shafts, bearings, drive systems, and supports. This paper proposes an analytical mechanical model for rotating-coil magnetometers, which allows a sensitivity analysis of mechanical phenomena affecting magnetic measurements. Both static and dynamic effects are considered. The model is validated numerically with a finite element model, and experimentally on an operational device.
Highlights
Magnet production follow-up requires several field measurements at various states of completion, after collaring, yoking, and cryostat integration
This paper proposes an analytical mechanical model for rotating-coil magnetometers, which allows a sensitivity analysis of mechanical phenomena affecting magnetic measurements
Because the mechanical model includes some hypotheses and empirical parameters, an experimental validation of the mechanical model is performed in two steps: first, the beam model is compared with a production rotating-coil magnetometer, whose mechanics is experimentally characterized
Summary
Magnet production follow-up requires several field measurements at various states of completion, after collaring, yoking, and cryostat integration. Rotating-coil magnetometers are the most common transducers for measuring the field quality inside the bore of magnets for chargedparticle accelerators. This paper provides a complete coupling model between mechanical effects and magnetic measurement results. The model is appropriate for both the design and the operation of rotating-coil magnetometers. It covers the geometrical description of the coil and its coupling with the shaft.
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