Bonn 2020 – wissenschaftliches Programm
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HK 21.5: Vortrag
Dienstag, 31. März 2020, 18:15–18:30, J-HS D
Concept of high-bandwidth pickups for a novel low charge bunch arrival time monitor as a part of the all-optical synchronization system at the European XFEL and FLASH — Bernhard Scheible1, Marie Kristin Czwalinna2, Wolfgang Ackermann3, Holger Schlarb2, Herbert De Gersem3, and •Andreas Penirschke1 — 1Technische Hochschule Mittelhessen, Germany — 2DESY Hamburg, Germany — 3Technische Universität Darmstadt, Germany
X-ray free-electron lasers open up new frontiers across many areas of research and science. Numerous experiments require pulse durations in the order of a few femtoseconds only - this demands for an overall time resolution with sub-10 fs precision.
Simultaneously the generation of ultrashort X-ray pulses is only feasible by shorter bunches in a low bunch charge operation mode. The European XFEL is currently operated with bunch charges down to 20 pC with a synchronization with sub 10 fs range - future experiments demand operation modes with bunch charges down to 1 pC with an overall timing stability below (5+1) fs rms. Ultra-low charges are a major challenge for the current all-optical synchronization system implemented in FLASH and European XFEL.
In the scope of this contribution a novel ultra-broadband pickup design for frequencies up to 100 GHz is presented. In order to achieve sufficient driving voltage for the attached electro-optical modulator, several pickups circularly assembled in the beamline need to be combined.