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Electron beam optics and trajectory control in the Fermi free electron laser delivery system

Di Mitri, S.; Cornacchia, M.; Scafuri, C. and Sjöström, Magnus LU (2012) In Physical Review Special Topics. Accelerators and Beams 15(1).
Abstract
Electron beam optics (particle betatron motion) and trajectory (centroid secular motion) in the FERMI@Elettra free electron laser (FEL) are modeled and experimentally controlled by means of the ELEGANT particle tracking code. This powerful tool, well known to the accelerator community, is here for the first time fully integrated into the Tango-server based high level software of an FEL facility, thus ensuring optimal charge transport efficiency and superposition of the beam Twiss parameters to the design optics. The software environment, the experimental results collected during the commissioning of FERMI@Elettra, and the comparison with the model are described. As a result, a matching of the beam optics to the design values is... (More)
Electron beam optics (particle betatron motion) and trajectory (centroid secular motion) in the FERMI@Elettra free electron laser (FEL) are modeled and experimentally controlled by means of the ELEGANT particle tracking code. This powerful tool, well known to the accelerator community, is here for the first time fully integrated into the Tango-server based high level software of an FEL facility, thus ensuring optimal charge transport efficiency and superposition of the beam Twiss parameters to the design optics. The software environment, the experimental results collected during the commissioning of FERMI@Elettra, and the comparison with the model are described. As a result, a matching of the beam optics to the design values is accomplished and quantified in terms of the betatron mismatch parameter with relative accuracy down to the 10(-3) level. The beam optics control allows accurate energy spread measurements with sub-keV accuracy in dedicated dispersive lines. Trajectory correction and feedback is achieved to a 5 mu m level with the implementation of theoretical response matrices. In place of the empirical ones, they speed up the process of trajectory control when the machine optics is changed, avoid particle losses that may occur during the on-line computation of experimental matrices, and confirm a good agreement of the experimental magnetic lattice with the model. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Special Topics. Accelerators and Beams
volume
15
issue
1
publisher
American Physical Society
external identifiers
  • wos:000299327500003
  • scopus:84856521478
ISSN
1098-4402
DOI
10.1103/PhysRevSTAB.15.012802
language
English
LU publication?
yes
id
e7f5b151-dd25-4ab7-baec-28b71933468e (old id 2355299)
date added to LUP
2012-02-24 08:42:17
date last changed
2017-11-12 03:47:50
@article{e7f5b151-dd25-4ab7-baec-28b71933468e,
  abstract     = {Electron beam optics (particle betatron motion) and trajectory (centroid secular motion) in the FERMI@Elettra free electron laser (FEL) are modeled and experimentally controlled by means of the ELEGANT particle tracking code. This powerful tool, well known to the accelerator community, is here for the first time fully integrated into the Tango-server based high level software of an FEL facility, thus ensuring optimal charge transport efficiency and superposition of the beam Twiss parameters to the design optics. The software environment, the experimental results collected during the commissioning of FERMI@Elettra, and the comparison with the model are described. As a result, a matching of the beam optics to the design values is accomplished and quantified in terms of the betatron mismatch parameter with relative accuracy down to the 10(-3) level. The beam optics control allows accurate energy spread measurements with sub-keV accuracy in dedicated dispersive lines. Trajectory correction and feedback is achieved to a 5 mu m level with the implementation of theoretical response matrices. In place of the empirical ones, they speed up the process of trajectory control when the machine optics is changed, avoid particle losses that may occur during the on-line computation of experimental matrices, and confirm a good agreement of the experimental magnetic lattice with the model.},
  articleno    = {012802},
  author       = {Di Mitri, S. and Cornacchia, M. and Scafuri, C. and Sjöström, Magnus},
  issn         = {1098-4402},
  language     = {eng},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review Special Topics. Accelerators and Beams},
  title        = {Electron beam optics and trajectory control in the Fermi free electron laser delivery system},
  url          = {http://dx.doi.org/10.1103/PhysRevSTAB.15.012802},
  volume       = {15},
  year         = {2012},
}