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| TUPPH009 |
Effects of Undulator Steering on FERMI@ELETTRA FEL
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251 |
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- S. Spampinati, S. Di Mitri, B. Diviacco
ELETTRA, Basovizza
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The extension of Free Electron Laser (FEL) operations to VUV and X-ray range places stringent requirements on the straightness of the electron beam trajectory along the undulator chain. The misalignment of magnetic active elements such as quadrupoles and undulators has a great impact on the beam trajectory. The FERMI FEL project foresees the adoption of the Beam Based Alignment (BBA) technique with open undulators to steer the electron beam on a straight path along the whole undulator chain. Quadrupole magnets will be centered on desired trajectory and steerer will be used to mantain that trajectory when quadrupol strengths are changed for different quadrupolo polarization. Steering elements at the undulator edges counteract the steering action of strong focusing of the apple type devices restoring the correct trajectory between the undulators. This article analyzes the effect of this trajectory distortion on the FERMI FEL performance.
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