skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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}
}