LOW-Q CAVITY BPM ELECTRONICS FOR E-XFEL, FLASH-II AND SwissFEL*

PSI has developed BPM electronics for low-Q cavity BPMs that will be used in the E-XFEL and FLASH2 undulators, as well as in SwissFEL injector, linac and transfer lines. After beam tests at the SwissFEL test injector (SFIT) and FLASH1, a pre-series of the electronics has been produced, tested and commissioned at FLASH2 [1]. The design, system features, signal processing techniques, lab-based test and calibration system as well as latest measurement results are reported.