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A Rotating-Coil Magnetometer for Scanning Transversal Field Harmonics in Accelerator Magnets
Pasquale Arpaia1, Gianni Caiafa2,3, Stephan Russenschuck4
1Instrumentation and Measurement for Particle Accelerators Laboratory, Department of Electrical Engineering and Information Technology, University of Napoli Federico II, Naples, Italy.
Abstract:
This paper presents a rotating-coil magnetometer that was designed and validated for scanning local transversal field harmonics, required for extracting so-called pseudo-multipoles in accelerator magnets. The magnetometer consists of four layers of flexible printed circuits with a track thickness of 40 μm. The design aimed at maximizing the sensitivity factors for field harmonics up to order 13 and at a compensation ratio for the main component in the same range of what is achievable with standard rotating coils. Key innovative features of the induction coil are the shape for minimizing the sensitivity to the longitudinal field component and the manufacturing technology. The design, the uncertainty analysis of the manufacturing tolerances, as well as preliminary application results are presented.
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