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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 6: Diagnostics, Control and Instrumentation I

AKBP 6.9: Vortrag

Mittwoch, 17. März 2021, 16:00–16:15, AKBPa

Investigation of the pickup signal for bunch arrival-time monitors with ultra-short electron bunches in free electron laser applications — •Bernhard Erich Jürgen Scheible^1,3, Marie Kristin Czwalinna², Wolfgang Ackermann³, Holger Schlarb², Herbert De Gersem³ und Andreas Penirschke¹ — ¹Technische Hochschule Mittelhessen, Friedberg, Germany — ²DESY, Hamburg, Germany — ³Technische Universität Darmstadt, Germany

X-ray free-electron lasers (XFEL) open up new frontiers across many areas of research and science. Numerous experiments require ultra-short pulse durations for measurements in fs-time-scales. Therefore, a reliable synchronization system with sub-10 fs precision is necessary, even for ultra-low bunch charges. The established all-optical synchronization systems depend on transient fields of passing electron bunches coupled into the pickups of the bunch arrival-time monitors (BAM). The extracted signal is imprinted on reference laser pulses by amplitude modulation in a Mach-Zehnder type electro-optical modulator. The sensitivity of the BAM depends in particular on the slope of the bipolar signal at the zero-crossing. In order to understand the limitations of the current pickups and to enable advances in design, it is crucial to examine the pickup signal by numerical and analytical methods. In this contribution, the theoretical foundations are reviewed with special attention to the less common case of ultra-short bunch lengths.