WEOBI1
ELETTRA, Basovizza, Italy
University of Nova Gorica, Nova Gorica, Slovenia
ENEA C.R. Frascati, Frascati (Roma), Italy
THOBI1
ELETTRA, Basovizza, Italy
| Paper | Title | Page |
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WEOBI1 |
FEL Commissioning at FERMI@Elettra | |
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| The FERMI@Elettra Free Electron Laser (FEL) produced the first coherent photons in December 2010 at the end of the first commissioning phase. Starting from February 2011 the commissioning has continued, leading to an improvement of the FEL performance. In agreement with to the design, FEL-1, the first of the two FERMI free electron lasers, has been producing coherent FEL pulses in the 60 to 20 nm wavelength range. Benefits of the seeded scheme adopted for FERMI have been immediately evident also in the case of a non-optimized electron beam. | ||
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Slides WEOBI1 [4.528 MB] | |
THOBI1 |
Polarization Control Experiences in Single-pass Seeded FELs | |
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| The design of FERMI@Elettra, being based on APPLE type undulators, allows a straightforward tuning of the polarization of the emitted radiation. The possibility to perform polarization-dependent experiments has been confirmed from the very first phases of FERMI’s commissioning. Moreover, at the seeded storage-ring FEL test facility installed at Elettra, which also relies on an APPLE-based optical klystron, we have measured the Stokes' parameters of coherent harmonic emission and demonstrated that the polarization tunability can be maintained also in the so-called non-linear harmonic generation regime. This result definitely extends the scientific opportunities offered by FERMI@Elettra and concretize the idea of reducing the minimum accessible wavelength at which polarization can be controlled down to the spectral range that matters for transition metal magnetism studies. After a brief discussion about the importance of polarization tunability on FEL light sources, we will review the present status of FEL projects aiming to achieve polarization control and we will present the most recent results obtained at FERMI@Elettra and at the storage-ring FEL of Elettra. | ||
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Slides THOBI1 [8.326 MB] | |