| Paper |
Title |
Page |
| TUPPH076 |
Electro-optic Techniques for Longitudinal Electron Bunch Diagnostics
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413 |
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- G. Berden, A. F.G. van der Meer
FOM Rijnhuizen, Nieuwegein
- W. A. Gillespie, P. J. Phillips
University of Dundee, Nethergate, Dundee, Scotland
- S. P. Jamison
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- A. MacLeod
UAD, Dundee
- B. Schmidt, P. Schmüser, B. Steffen
DESY, Hamburg
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Electro-optic (EO) techniques are becoming increasingly important in ultrafast electron bunch longitudinal diagnostics and have been successfully implemented at various accelerator laboratories. The longitudinal bunch shape is directly obtained from a single-shot, non-intrusive, measurement of the temporal electric field profile of the bunch. Furthermore, the same EO techniques are used to measure the temporal profile of terahertz / far-infrared optical pulses generated by a CTR screen, at a bending magnet (CSR) or by an FEL. This contribution summarizes the results obtained at FELIX and FLASH.
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| TUPPH068 |
Coherent Micro-Bunching Radiation from Electron Bunches at FLASH in the 10 Micrometer Wavelength Range
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397 |
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- B. Schmidt, C. Behrens, S. Wesch
DESY, Hamburg
- H. Delsim-Hashemi, P. Schmüser
Uni HH, Hamburg
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At FLASH (DESY), a single shot broad band spectrometer THz spectrometer has been developed and installed which allows to measure the spectra of coherent bunch radiation for wavelengths between 2 micrometer and 300 micrometer. The spectrometer uses coherent transition radiation from an off-axis screen, extracted through a diamond window. Using this instrument, we found that the electron bunches emit coherent radiation in the regime 5 - 15 micrometer with an intensity which is almost independent of the bunch compressor strength. The radiation is present even for bunch lengths of several picoseconds. The shape of the spectrum indicates that the radiation is produced by a 'micro-bunching' of the charge density with a characteristic length in the 10 micrometer range. In this paper, we present systematic studies into the origin of this radiation, including its charge dependence, dependence on the photon injector parameters and on the strength of the magnetic chicanes and the bunch compression scheme.
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