Longtitudinal electron beam diagnostics via upconversion of THz to visible radiation
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Longitudinal electro-optic electron bunch diagnostics has been successfully applied at several accelerators. The electro-optic effect can be seen as an upconversion of the Coulomb field of the relativistic electron bunch (THz radiation) to the visible spectral range, where a variety of standard diagnostic tools are available. Standard techniques to characterise femtosecond optical laser pulses (auto- and cross-correlators) have led to the schemes that can measure electron bunch profiles with femtosecond resolution. These techniques require, however, well synchronized femtosecond laser pulses, in order to obtain the desired temporal resolution. Currently, we are exploring other electro-optic variants which require less advanced laser systems and will be more amenable to beam based longitudinal feedback applications. The first results of one such new scheme will be presented in this paper.
Berden, G. et al. 2009. Longitudinal electron beam diagnostics via upconversion of THz to visible radiation. In: Proceedings of 31st International Free Electron Laser Conference (FEL09), Liverpool, 23-28 August 2009. [Online]. Available from: http://accelconf.web.cern.ch/AccelConf/FEL2009/papers/wepc80.pdf