A reconfigurable miniaturized transducer based on rotating coils for testing particle accelerator magnets

The design of a reconfigurable transducer, based on rotating coils realized by printed circuit board (PCB), is proposed for testing magnets in particle accelerators. Despite classical rotating coils, the sensitivity of this transducers is not completely established with the design. Different configurations allow to tune sensitivity to the specific components of the magnetic flux density to be measured. At this aim, specific field harmonics such as dipole, quadrupole, sextupole, octupole, and decapole can be suppressed. Thus, the same accuracy level can be ensured in measuring the field quality of several types of magnets. In this paper, first, conventional design criteria are recalled. Then, the design of the reconfigurable transducer based on four coils to suppress undesired field harmonics, from dipole up to decapole, is illustrated. The possibility of using both radial and tangential geometry, without affecting compensation quality, is highlighted too. Finally, a metrological analysis about the transducer manufacturing is reported, proving that the uncertainty arising from the PCB production is made negligible.