Status of Pulsed Wire Magnet Field Measurement Set-up at HZB/BESSY

Abstract The IVU32 is the world’s first in-vacuum APPLE II undulator currently under development at HZB. Magnetic characterisation and tuning of this short-period small-gap device will be carried out using measurements with an in-vacuum Hall probe bench and moving wire system, as well as with a pulsed wire measurement (PWM) setup. The PWM technique is an especially useful solution for measuring the magnetic field in limited undulator gaps, such as those found in in-vacuum and cryogenic devices. The pulsed wire system at HZB enables a complete characterization of the undulator magnetic field and provides a cost-efficient technique for fast and easy measurements. We present the state of development of the pulsed wire system at HZB and discuss the limitations of the method, for example, due to the specific wire properties that influence the error increase and thus measurement accuracy.