Ssdi 0168 - 9002 ( 93 ) E 0837 - 1 Nuclear Instruments & Methods in Physics Research


Free electron lasers (FELs) have until now been limited to the infrared, visible and near UV part of the electromagnetic spectrum . Recent progress in FEL physics and technology is changing this situation, and an effort is now under way to design and build FELs operating at wavelengths shorter than 100 nm . Three main avenues are being followed to reach this goal : FELs oscillators based on storage rings ; FEL oscillators based on linacs ; harmonic generation ; linac based FELs operating in the Self Amplified Spontaneous Emission (SASE) mode . The last approach has been followed by a SLACUCLA-LBL-LLNL collaboration [1] to design a 2 to 4 nm soft X-ray FEL utilizing the existing SLAC linac and the possibility it offers to produce high brightness electron beams of energy up to 50 GeV. The main characteristics of this soft X-ray FEL are given in Tables 1 and 2. A SASE FEL avoids the use of optical cavities by operating as a single pass, high gain amplifier starting from spontaneous radiation [2,3]. In the soft X-ray region mirrors are lossy and subject to damage from

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@inproceedings{Pellegrini2002Ssdi0, title={Ssdi 0168 - 9002 ( 93 ) E 0837 - 1 Nuclear Instruments & Methods in Physics Research}, author={Claudio de Pellegrini and Luigi De Salvo and Pierluigi Pierini}, year={2002} }