Compact single-shot electro-optic detection system for THz pulses with femtosecond time resolution at MHz repetition rates

Steffen, B.; Gerth, Ch.; Caselle, M.; Felber, M.; Kozak, T.; Makowski, D. R.; Mavrič, U.; Mielczarek, A.; Peier, P.; Przygoda, K.; Rota, L.

doi:10.1063/1.5142833

Compact single-shot electro-optic detection system for THz pulses with femtosecond time resolution at MHz repetition rates

Journal Article · Thu Apr 30 00:00:00 EDT 2020 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.5142833· OSTI ID:1633849

^[1]; ^[1]; ^[2]; Felber, M. ^[1]; Kozak, T. ^[1]; ^[3]; Mavrič, U. ^[1]; ^[3]; Peier, P. ^[4]; ^[1]; Rota, L. ^[5]

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Karlsruhe Inst. of Technology, Eggenstein-Leopoldshafen (Germany)
Łódź Univ. of Technology (Poland)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Eidgenössisches Inst. für Metrologie, Bern (Switzerland)
Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States)

Electro-optical detection has proven to be a valuable technique to study temporal profiles of THz pulses with pulse durations down to femtoseconds. As the Coulomb field around a relativistic electron bunch resembles the current profile, electro-optical detection can be exploited for non-invasive bunch length measurements at accelerators. We have developed a very compact and robust electro-optical detection system based on spectral decoding for single-shot longitudinal bunch profile monitoring at the European X-ray Free Electron Laser (XFEL) for electron bunch lengths down to 200 fs (rms). Apart from the GaP crystal and the corresponding laser optics at the electron beamline, all components are housed in 19 in. chassis for rack mount and remote operation inside the accelerator tunnel. An advanced laser synchronization scheme based on radio-frequency down-conversion has been developed for locking a custom-made Yb-fiber laser to the radio-frequency of the European XFEL accelerator. In order to cope with the high bunch repetition rate of the superconducting accelerator, a novel linear array detector has been employed for spectral measurements of the Yb-fiber laser pulses at frame rates of up to 2.26 MHz. In this paper, we describe all sub-systems of the electro-optical detection system as well as the measurement procedure in detail and discuss the first measurement results of longitudinal bunch profiles of around 400 fs (rms) with an arrival-time jitter of 35 fs (rms).

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: German Federal Ministry of Education and Research (BMBF); USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1633849

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 4 Vol. 91; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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47 OTHER INSTRUMENTATION
Laser optics
electro-optics
electron beams
femtosecond lasers
fiber optical amplifiers
free election lasers
linear accelerators
photodiode arrays
signal processing

Compact single-shot electro-optic detection system for THz pulses with femtosecond time resolution at MHz repetition rates

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