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Single shot longitudinal electron bunch measurements with MHz repetition rate at the European x-ray FEL using electro-optical techniques (Conference Presentation)
Author(s): Bernd Steffen; Christopher Gerth; Serge Bielawski; Christophe Szwaj; Michele Caselle; Lorenzo Rota; Dariusz Makowski; Aleksander Mielczarek
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Paper Abstract

The Accelerator for the European X-Ray Free Electron Laser delivers femtosecond electron bunches at an energy of currently 14GeV at a repetition rate of up to 4.5MHz in bursts of up to 2700 pulses every 100ms to distribute them between different undulator beamlines. The emitted femtosecond x-ray laser pulses at wavelengths between 0.05nm and 6nm can serve up to three experiments in parallel. To measure the longitudinal bunch profile of the electron bunches, three detection systems based on electro-optical spectral decoding have been installed and are currently being commissioned. The systems are capable of recording individual longitudinal bunch profiles of all bunches in a burst with sub-ps resolution at a bunch repetition rate of 1.1 MHz, sampling the electron Coulomb field with laser pulses at 1030nm. A short detector latency of about 10µs also gives the prerequisites to establish a fast intra-burst feedback to stabilize the bunch profile. Bunch lengths and arrival times of entire bunch trains with single-bunch resolution have been measured as well as jitter and drifts for consecutive bunch trains. For comparison of detection techniques at one position, the laser signal is split and measured with a time-stretch setup in parallel.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10903, Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IV, 1090308 (4 March 2019); doi: 10.1117/12.2511673
Show Author Affiliations
Bernd Steffen, Deutsches Elektronen-Synchrotron (Germany)
Christopher Gerth, Deutsches Elektronen-Synchrotron (Germany)
Serge Bielawski, Univ. des Sciences et Technologies de Lille (France)
Christophe Szwaj, Univ. des Sciences et Technologies de Lille (France)
Michele Caselle, Karlsruher Institut für Technologie (Germany)
Lorenzo Rota, Karlsruher Institut für Technologie (Germany)
SLAC National Accelerator Lab. (United States)
Dariusz Makowski, Lodz Univ. of Technology (Poland)
Aleksander Mielczarek, Lodz Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 10903:
Real-time Measurements, Rogue Phenomena, and Single-Shot Applications IV
Daniel R. Solli; Georg Herink; Serge Bielawski, Editor(s)

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