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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 14: Instrumentation II

AKBP 14.6: Talk

Thursday, March 23, 2023, 16:45–17:00, CHE/0183

Analytic formulation of the zero-crossing slope for a circular button-like pickup — •Stefano Mattiello, Bernhard Erich Jürgen Scheible, and Andreas Penirschke — Technische Hochschule Mittelhessen, Friedberg, Hessen

With the emerging demand of the experimenters for future experiments with ultra-short X-ray free-electron lasers (XFEL) shots, fs precision is required for the synchronization systems even with 1 pC bunches using one or more button-like pickups in the Bunch Arrival Time Monitors (BAM). Because the sensitivity of the BAM depends in particular on the slope of the bipolar signal at the zero crossing and thus, also on the bunch charge, a precise theoretical prediction of the slope is a challenging and fundamental task. In this contribution the theoretical foundations of the pickup signal are presented in a systematic way, and we focus on a button-like pickup with circular active surface, that is the standard choice in the past. We present an exact general estimation of the zero-crossing slope and then discuss the results for ultra-short bunches. The comparison to the long-bunch case allows to achieve a deeper understanding of the features of these limiting cases as well as of the intermediate region.