Gusvitskii, T.

Kubeb, G.

Novokshonov, A.

Potylitsyn, Alexander Petrovich

Sukhikh, Leonid Grigorievich

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Electronic archive of Tomsk Polytechnic University

XIII International Symposium RREPS-19, 15-20 September 2019, Belgorod, Russia 23Coherent OTR as a Tool for Transverse Bunch SizeMeasurementsA.Potylitsyna, T.Gusvitskiia, L.Sukhikha, G.Kubeb,A.Novokshonovb,1a Tomsk Polytechnic University, Tomsk, Russiab Deutsches Elektronen Synchrotron (DESY), Hamburg, GermanyOptical Transition Radiation (OTR) is widely used for transverse beam profilediagnostics at electron linear accelerators. But this technique may not beimplemented for FEL’s[1] or LWPA accelerators[2], the reason is that suchmachines have ultrashort bunches causing coherent effects in the OTR emissionprocess[3]. An approach to calculate the coherent OTR (COTR) propagationthrough a standard optical system with a focusing lens has been developed.COTR image of the bunch profile is obtained by the summation of the OTRfields coherently emitted by all electrons from a bunch and then focused in thedetector plane. Assuming the bunch transverse profile is a Gaussian type it wasshown that the final image has a typical ”ring” shape. The characteristics of suchimage depend on the bunch transverse size and can be determined from the COTRimage measurement for known optical system parameters.This work was supported by the grant of the Russian Ministry of Science #3/1903.2017.References[1] E.Saldin, E.Schneidmiller, M.Yurkov, The Physics of Free Electron Lasers // Springer-Verlag, 2010.[2] N.Bourgeois, et al., Transverse Beam Profile Measurements of Laser Accelerated Electrons using Coherent OpticalRadiation // AIP Conf. Proc., 1507, (2012) 258.[3] H.Loos, R.Akre, et al., Observation of Coherent Optical Transition Radiation in the LCLS Linac // SLAC-PUB-13395(2008).1 Corresponding author: nov.art.ig@gmail.com

Coherent OTR as a Tool for Transverse Bunch Size Measurements

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Coherent OTR as a Tool for Transverse Bunch Size Measurements

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