Single-shot longitudinal bunch profile measurements at FLASH using electro-optic detection: experiment, simulation, and validation

B. Steffen, E. A. Knabbe, H. Schlarb, B. Schmidt, P. Schmüser, W. Allan Gillespie, P. J. Phillips, S. P. Jamison, G. Berden, A. F. G. van der Meer, Allan M. MacLeod

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Abstract

At the superconducting linac of FLASH at DESY, we have installed an electro-optic (EO) experiment for single- shot, non-destructive measurements of the longitudinal electric charge distribution of individual electron bunches. The time profile of the electric bunch field is electro- optically encoded onto a chirped titanium-sapphire laser pulse. In the decoding step, the profile is retrieved either from a cross-correlation of the encoded pulse with a 30 fs laser pulse, obtained from the same laser (electro- optic temporal decoding, EOTD), or from the spectral intensity of the transmitted probe pulse (electro-optic spectral decoding, EOSD). At FLASH, the longitudinally compressed electron bunches have been measured during FEL operation with a resolution of better than 50 fs. The electro-optic process in gallium phosphide was numerically simulated using as input data the bunch shapes determined with a transverse-deflecting RF structure. In this contribution, we present electro-optically measured bunch profiles and compare them with the simulation.
Original languageEnglish
Title of host publicationProceedings of the 29th International Free Electron Laser Conference (FEL07), Novosibirsk, August 26-31 2007
Pages310-313
Number of pages4
Publication statusPublished - 2007

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    Steffen, B., Knabbe, E. A., Schlarb, H., Schmidt, B., Schmüser, P., Gillespie, W. A., Phillips, P. J., Jamison, S. P., Berden, G., van der Meer, A. F. G., & MacLeod, A. M. (2007). Single-shot longitudinal bunch profile measurements at FLASH using electro-optic detection: experiment, simulation, and validation. In Proceedings of the 29th International Free Electron Laser Conference (FEL07), Novosibirsk, August 26-31 2007 (pp. 310-313) http://accelconf.web.cern.ch/AccelConf/f07/HTML/AUTHOR.HTM