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THOA02 |
Photon Beam Transport Systems at FERMI@Elettra: Microfocusing FEL Beam with a K-B Active Optics System | |
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FERMI@Elettra, the first seeded EUV-SXR FEL facility, located at Sincrotrone Trieste S.C.p.A., is under advanced commissioning. It will provide ultrashort (10-100 fs) pulses with high peak brightness in the range 100-4 nm. The photon diagnostics section (PADReS) has been installed and commissioned during the last years. Three of the four installed beam lines (EIS-TIMER, EIS-TIMEX, DiProI and LDM) will employ active X-ray optics for focusing and beam-shaping. For DiProI and LDM the beam focusing is accomplished by K-B active X-ray optic mirrors to reach the fundamental diffraction limit. This system allows work with the two different undulator chains FEL1 and FEL2, which have different source locations, and perform an accurate mirror shaping and wave front optimization. In this work we present preliminary results of measurements with the DiProI beamline end-station. A focal spot size <20 μm at 32 nm has been obtained. We also compare these measurements with the predictions computed with a numerical method based on physical optics (Raimondi-Spiga Code [1]) starting from the mirror surface profile characterization. Measurements and simulations are in agreement.
[1] Raimondi L., Spiga D., 2011, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series Vol. 8147 of Society |
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Slides THOA02 [5.317 MB] | |