An overview of the undulator field measurement studies at insertion device lab, DAVV

This paper describes undulator field measurement procedures by hall probe and the pulsed wire method. The Hall probe method gives the direct field mapping and calculates the field integrals through double numerical integration. A pulsed wire magnetic measurement method is an optical method which has been independently developed by DAVV. It gives directly the field integrals and calculates the field mapping via a double numerical differentiation. The measurement methods are illustrated with field measurement of a six period PPM undulator and a third harmonic undulator.