Beam conditioning for FELs: Consequences and methods
The consequences of beam conditioning in four example cases (VISA, a Soft X-Ray FEL, LCLS and a ''Greenfield'' FEL) are examined. It is shown that in emittance limited cases, proper conditioning reduces sensitivity to the transverse emittance and, furthermore, allows for stronger focusing in the undulator. Simulations show higher saturation power, with gain lengths reduced by a factor of two or more. The beam dynamics in a general conditioning system are studied, with ''matching conditions'' derived for achieving conditioning without growth in the effective emittance. Various conditioning lattices are considered, and expressions derived for the amount of conditioning provided in each case when the matching conditions are satisfied. These results show that there is no fundamental obstacle to producing beam conditioning, and that the problem can be reduced to one of proper lattice design. Nevertheless, beam conditioning will not be easy to implement in practice.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of High Energy Physics (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 831103
- Report Number(s):
- LBNL-53899-Journal; CBP Note - 544; R&D Project: 455301; TRN: US0405627
- Journal Information:
- Physical Review Special Topics: Accelerators and Beams, Vol. 7; Other Information: Journal Publication Date: 2004; PBD: 29 Jun 2004
- Country of Publication:
- United States
- Language:
- English
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