Current-enhanced SASE using an optical laser and its applicationto the LCLS
We propose a significant enhancement of the electron peak current entering a SASE undulator by inducing an energy modulation in an upstream wiggler magnet via resonant interaction with an optical laser, followed by microbunching of the energy-modulated electrons at the accelerator exit. This current enhancement allows a reduction of the FEL gain length. The x-ray output consists of a series of uniformly spaced spikes, each spike being temporally coherent. The duration of this series is controlled by the laser pulse and in principle can be narrowed down to just a single, 200-attosecond spike. Given potentially absolute temporal synchronization of the x-ray spikes to the energy-modulating laser pulse, this scheme naturally makes pump-probe experiments available to SASE FEL's. We also study various detrimental effects related to the high electron peak current.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. ContractsDE-AC03-76SF00098 and DE-AC02-76SF00515
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 860308
- Report Number(s):
- LBNL-54967; R&D Project: Z3FALS; BnR: YN0100000; TRN: US0504983
- Resource Relation:
- Conference: 26th International Free Electron LaserConference, Trieste, ITALY, 29 August - 3 September2004
- Country of Publication:
- United States
- Language:
- English
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