A Permanent Magnet Phase Shifter for the European X-Ray Free Electron Lasern

In undulator systems with adjustable gaps phase shifters are needed to exactly control the phase retardation between electrons and the radiation field over the entire length of an undulator system. A phase shifter based on Permanent Magnet technology for the use in the European XFEL has been developed and tested. Specifications are given. This paper will explain its magnetic principle and design. Magnetic test results are presented and thoroughly discussed. Special attention is given to the operation in the XFEL