| Paper |
Title |
Page |
| TUPPH009 |
Effects of Undulator Steering on FERMI@ELETTRA FEL
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251 |
| |
- 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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| TUPPH043 |
Diagnostics of the Laser Heater Induced Beam Heating in FERMI@elettra
|
342 |
| |
- S. Spampinati, S. Di Mitri, M. Ferianis, M. Veronese
ELETTRA, Basovizza
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The FERMI@elettra project foresees a laser heater at low energy (~ 100 MeV); this tool has been proposed to cure the microbunching instability that affects the high brightness electron beam. It consists of an undulator located in a small magnetic chicane that allows seeding of the electron beam with an external laser. The particles interact in a short undulator with the laser pulse and then gain an energy modulation on the scale of the optical wavelength. As a result, the laser-electron interaction together with with the R52 transport term leads to an effective beam heating. This article describe the capability of diagnostic dedicated to enlighten the laser heater operation
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