DIAGNOSTICS OF ULTRASHORT ELECTRON BUNCHES DEVELOPED AT JINR

O. Brovko, D. Kharlamov, O. Kozlov, S. Kostromin, R. Makarov, E. Matyushevskiy, N. Morozov, E. Syresinª, B. Zalikhanov, M. Yurkov

Joint Institute for Nuclear Research, Dubna, Russia

Abstract

Different methods for diagnostic of ultrashort electron bunches are developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects and JINR participation in the ILC project. The main peculiarity of these accelerator complexes is related to formation of ultrashort electron bunches with r.m.s. length 20÷300 μm. Novel diagnostics is required to provide femtoscale time resolution in the modern FEL like FLASH and future XFEL and ILC projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort bunches are based on calorimetric measurements and detection of undulator radiation. The MCP based radiation detectors are effectively used at FLASH for pulse energy measurements. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. A special magnetic spectrometer is planning to be used in ILC for measurements of average electron energy in each bunch. The first test spectrometer measurements were performed within the JINR-DESY-SLAC collaboration.

ª – corresponding author

Paper Slides

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