Production Tests, Calibration, and Commissioning of Button BPMs for the European XFEL

Le résumé fourni par la source

Commissioning of the entire European XFEL started early 2017. More than 300 button-electrode type beam position monitors (BPMs) are used in its cold Linac and warm beam transfer lines. Signal processing in the BPM RF front-end (RFFE) electronics employs signal stretching by chirp filtering, switchable gain stages, digital step attenuators, and peak detection. In this paper we present details on RF front-end production tests, calibration, and BPM beam commissioning results. Furthermore, a calibration pulser circuit that is built into each BPM electronics is presented. The setup and algorithms for production calibration of all RFFEs are described. Finally, resolution measurements obtained by correlation among all XFEL BPMs (including cavity and re-entrant types) are presented, confirming that the system can be used for orbit correction and transmission measurement down to bunch charges of a few pico-Coulombs.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.