Beam conditioning for FELs: Consequences and methods
Abstract
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.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Director. Office of Science. Office of High Energy Physics (US)
- OSTI Identifier:
- 831103
- Report Number(s):
- LBNL-53899-Journal; CBP Note - 544
R&D Project: 455301; TRN: US0405627
- DOE Contract Number:
- AC03-76SF00098
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review Special Topics: Accelerators and Beams
- Additional Journal Information:
- Journal Volume: 7; Other Information: Journal Publication Date: 2004; PBD: 29 Jun 2004
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS; BEAM DYNAMICS; DESIGN; FOCUSING; SATURATION; SENSITIVITY; FEL BEAM CONDITIONING
Citation Formats
Wolski, A, Penn, G, Sessler, A, and Wurtele, J. Beam conditioning for FELs: Consequences and methods. United States: N. p., 2004.
Web.
Wolski, A, Penn, G, Sessler, A, & Wurtele, J. Beam conditioning for FELs: Consequences and methods. United States.
Wolski, A, Penn, G, Sessler, A, and Wurtele, J. 2004.
"Beam conditioning for FELs: Consequences and methods". United States.
@article{osti_831103,
title = {Beam conditioning for FELs: Consequences and methods},
author = {Wolski, A and Penn, G and Sessler, A and Wurtele, J},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/831103},
journal = {Physical Review Special Topics: Accelerators and Beams},
number = ,
volume = 7,
place = {United States},
year = {Tue Jun 29 00:00:00 EDT 2004},
month = {Tue Jun 29 00:00:00 EDT 2004}
}