Measurement of Eddy Current Transients in Fast-cycled Linac Quadrupole Magnets at Cern

− The paper deals with a fast measurement technique of electromagnetic transients due to eddy currents in fast-cycled magnets for linear particle accelerators. First the context of the problem, related to the need for accurate control of the magnetic field quality in order to ensure the stability and performance of the particle beam in dynamic conditions (field ramps up to about 700 T/s) is outlined. Then the measurement technique and the setup employed are described by referring to a case study on a quadrupole magnet for Linac4, a new linear particle accelerator currently being built at CERN (European Organization for Nuclear Research). Finally, the results of the measurement campaigns carried out on a quadrupole magnet and on a reference air-core solenoid are discussed.