Journal Article

PUBDB-2024-05851

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Seismic Noise Contributions to EuXFEL Bunch Arrival Time Jitter from Ocean-Generated Microseism

Genthe, E. (Corresponding author)DESY* ; Czwalinna, M. K.DESY* ; Lautenschlager, B.DESY* ; Schlarb, H.DESY* ; Hadziioannou, C.Extern* ; Gerberding, O.Extern* ; Isleif, K.-S.DESY*

2025
Cambridge Univ. Press Cambridge

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Please use a persistent id in citations: doi:10.1017/hpl.2025.40  doi:10.3204/PUBDB-2024-05851

Abstract: Measurements of the bunch arrival times at the European XFEL show noise contributions in the spectral rangebetween 0.05 Hz and 0.5 Hz with peak-to-peak jitter of up to 25 fs. Correlation with Distributed Acoustic Sensing(DAS) measurements confirms the seismic origin. The seismic noise in this frequency band is known to be ocean-generated microseism. Both primary and secondary ocean-generated microseism were identified using seismometersand a numerical ocean wave model. Whereas secondary microseism has a strong impact on the bunch arrival time,primary microseism has no notable effect. Rayleigh waves cause the effect, while Love waves have minimal impact.In the presented cases, the noise originates from the North Atlantic and/or the North Sea. The amplitude of the noisedepends on the local weather conditions and is much stronger in winter. Ocean-generated microseism is a significantbottleneck that must be addressed to achieve femtosecond bunch arrival time stability in the sub-Hz regime

Note: Title has changed to: Seismic Noise Contributions to EuXFEL Bunch Arrival Time Jitter from Ocean-Generated Microseism

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Contributing Institute(s):

1. Strahlkontrollen (MSK)

Research Program(s):

1. 621 - Accelerator Research and Development (POF4-621) (POF4-621)
2. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. No specific instrument
2. Experiments at XFEL

Appears in the scientific report 2025

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