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| TUPPH007 |
Spatial Coherence Measurement of UVSOR-II Free Electron Laser
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- O. V. Chubar, M.-E. Couprie
SOLEIL, Gif-sur-Yvette
- K. Fukui
University of Fukui, Fukui
- M. Hosaka
Nagoya University, Nagoya
- M. Katoh, A. Mochihashi, M. Shimada
UVSOR, Okazaki
- G. Lambert
RIKEN Spring-8, Hyogo
- M. Labat
CEA, Gif-sur-Yvette
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The well defined phase relationship of coherent radiation is wished for a large number of experiments. The advent of very small emittance electron beams allowed improvement of the transverse coherence of the undulators radiation and lead to extensive use of modern synchrotron facilities in the visible to x-ray domain. Nevertheless, Free Electron Lasers (in particular in the seeded Coherent Harmonic Generation (CHG) scheme) may offer additional capabilities such as shorter pulse duration, smaller spectral bandwidth, higher peak power and improved transverse coherence. Transverse coherence of the third Coherent Harmonic has been studied on the UVSOR-II storage ring (Japan) at 600 MeV, using a 2.5 mJ, 1 kHz, 1.2 ps Ti:Sa laser at 800 nm wavelength with the double slit method. The improvement of the transverse coherence of the FEL radiation compared to spontaneous emission is shown via the visibility of the interference pattern resulting from double slits. The experimental results are compared to analytical calculations as well as to 3D FEL and wavefront propagation simulations performed with SRW.
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