Development of a Test Bench for Magnetic Measurements on E-XFEL Phase Shifters

A test bench has been developed for the magnetic measurements on the Phase Shifters for E-XFEL. It will be part of the Spanish in-kind contribution to this new research facility. The most challenging specification of the phase shifter is given for the variation of the first field integrals (in both horizontal and vertical components), with a tolerance interval of ±4 × 10^-6 T·m. Besides, it is necessary to measure the phase integral as a function of gap for the proper operation of the accelerator. Different systems have been analyzed during the conceptual design of the test bench. Finally, the selected configuration is based on a long coil and a voltage integrator, because of its high accuracy and moderate complexity. The objective of this paper is to describe the development of this device (including design, manufacturing, assembly and calibration) and to present the measurements performed on the first phase shifter prototypes. Especial attention has been paid to the treatment of the raw data to compensate the systematic errors and deficiencies of the method.