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Description
A novel planar pickup structure on a printed circuit board (PCB) with an integrated combination network has been developed for the electro-optical bunch arrival-time monitors (EO-BAMs) used at the European XFEL and other free-electron laser (FEL) facilities. The design aims for single-digit fs resolution during 1 pC operation in FEL and ultrafast electron diffraction facilities, as well as an overall performance improvement during standard FEL operation. Initial measurements with the first vacuum-sealed demonstrator at the ELBE accelerator proved the viability of this approach, though design trade-offs limited the realization of its full potential. In 2025, an in-air test stand was manufactured to allow for extensive studies of different PCB layouts at the FLUTE accelerator at KIT. In this work, results of two RF measurement series are presented. These radio-frequency (RF) signal measurements were performed down to 80 fC utilizing an 80 GHz real-time oscilloscope adjacent to the beamline. The results surpassed the design goals set for 1 pC bunches. Additionally, through signal averaging, another distinct signal component is visible. Preliminary analysis suggests this is attributable to dark currents with an equivalent bunch charge of less than 10 fC, demonstrating the high sensitivity of the planar pickup design.
Funding Agency
This work is supported by the German Federal Ministry of Research, Technology and Space (BMFTR) under Contracts No. 05K25ROA and 05K25VKB.
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| Supervisor's name | Andreas Penirschke |
| Supervisor's email | andreas.penirschke@iem.thm.de |
| Paper submission software | LATeX |