Contribution to a conference proceedings/Contribution to a book

PUBDB-2025-01653

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Substrate material studies for PCB-based electro-optical bunch arrival-time monitors for XFELs

Scheible, B. E. J. (Corresponding author) ; Penirschke, A. ; Czwalinna, M. K.DESY* ; Nazer, N.DESY* ; Roever, J.DESY* ; Schlarb, H.DESY* ; Ackermann, A. ; De Gersem, H. ; Kuntzsch, M.

2025
JACoW Publishing Geneva
ISBN: 978-3-95450-248-6

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Please use a persistent id in citations: doi:10.18429/JACoW-IPAC2025-THPS107  doi:10.3204/PUBDB-2025-01653

Abstract: The all-optical synchronization system used in many X-ray free-electron laser facilities (XFELs) relies on electro-optical bunch arrival-time monitors (EO-BAM) for measuring the single bunch arrival time with regards to an optical reference. An upgrade of the established EO-BAM is intended to achieve a sensitivity that enables stable operation with bunches down to charges of 1 pC, or to significantly increase the resolution in normal operation. Therefore, the pickup structure, the RF path and the electro-optical modulators are undergoing a fundamental redesign. The novel concept of the pickup structure comprises planar pickups on a printed circuit board (PCB) with integrated combination network and a bandwidth of up to 100 GHz. The theoretical jitter charge product of the preliminary concept has been estimated to be in the order of 9 fs pC and the concept was proven experimentally with a 67-GHz demonstrator at ELBE. In this contribution, we compare ceramic and glass substrates in terms of radiation hardness, sensitivity, and manufacturing capabilities. The achievable bandwidth and sensitivity are influenced by material losses and varying tolerances due to different fabrication methods.

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Contributing Institute(s):

1. Strahlkontrollen (MSK)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. 05K22RO2 - Verbundprojekt 05K2022 - ULCBAMs: Elektro-optische und HF-basierte Ankunftzeitmonitore für extrem kleine Ladungen. Teilprojekt 1: Realisierung und Test neuer BAM-Frontends in dedizierten Beschleunigern und Testeinrichtungen. (BMBF-05K22RO2) (BMBF-05K22RO2)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
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