Dresden 2026 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 9: RF Cavities I
AKBP 9.6: Talk
Wednesday, March 11, 2026, 12:15–12:30, SCH/A117
V-Band Microwave Cavities for Pulse Compression in an Ultrafast Transmission Electron Microscope — •Johann Toyfl1,2, Dennis Naraschkewitz-Epp1,2, Armin Feist1,2, and Claus Ropers1,2 — 1Department of Ultrafast Dynamics, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany — 24th Physical Institute, University of Göttingen, Göttingen, Germany
Ultrashort electron bunches are a unique source of coherent radiation, but utilizing their short matter wavelength for nanoscale probing was only recently achieved in ultrafast electron microscopes (UEM). However, their temporal resolution is typically limited by electron pulse dispersion to a few hundred femtoseconds [1].
In this contribution, we explore high-frequency V-band microwave cavities to compress the longitudinal phase space of electron pulses generated by femtosecond photoemission, either in the temporal or energy domain [1, 2, 3]. We characterize the microwave reflection coefficient and use our ultrafast transmission electron microscope (UTEM) [1] to obtain electric-field maps by spectroscopic imaging.
The integration of cavity-based phase-space control will enhance the temporal and spectral resolution of UEM, enabling the study of ultrafast dynamics that are currently accessible only in large-scale free-electron laser facilities.
[1] A. Feist et al., Ultramicroscopy 176, 63 (2017) [2] T. van Oudheusden et al., Phys. Rev. Lett. 105, 264801 (2010) [3] R. P. Chatelain et al., Appl. Phys. Lett. 101, 081901 (2012) [4] J. Kuttruff et al., Sci. Adv. 10, eadl6543 (2024)
Keywords: ultrafast transmission electron microscope; microwave cavity; V-band; pulse compression; cavity based phase space control