PRELIMINARY MEASUREMENT RESULTS OF THE UPGRADED ENERGY BPM AT FLASH

The energy beam position monitor in the dispersive section of the two bunch compressors is a valuable instrument for regular operation of FLASH. Recently, an upgrade of the existing instrument to an MTCA form factor has been started. The basic principle of the time-of-flight measurement will remain the same; however the detection of the phases and amplitudes of two pulses has been moved to the programmable gate array. Other changes include different RF frequencies of detection, optimization of the front-end section and integration into the control system. A preliminary version of the system has been tested at FLASH and the results are presented in the paper