Analytical treatment of electron trajectory straightener issues in free-electron lasers
- Los Alamos National Lab., NM (USA)
The poincare orbit of the electron's journey must be straight and narrow through a many period FEL. To utilize an available technology level, the straightest wiggler orbit operating point (SWOOP) is chosen by adjusting the spacing parameter of an orbit correction scheme. This eases the requirements for achieving the full potential of FEL wigglers. One quality index, one cost index, two quality factors, two measures of field noise, an improvement index, and a straightener classification scheme are concepts that facilitate the analysis. Only when the field noise is large, is this analysis of direct use. A reader-friendly description culminates in the comparison of two schemes to illustrate the methods. Two coupled first order langevin equations have solutions that are proven to be gaussian variables. The solutions are used to give the required cross correlations. These results are coupled with a simple graphical technique and give an expression for the angular variance in the correction corridor. The two components of this variance are compared to a fiducial scheme and yield the two quality factors from which the quality, improvement and cost indices are computed. 68 refs., 5 figs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOD
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5418674
- Report Number(s):
- LA-UR-89-3486; CONF-8908134-13; ON: DE90002405
- Resource Relation:
- Conference: 11. international free electron laser conference, Naples, FL (USA), 28 Aug - 1 Sep 1989
- Country of Publication:
- United States
- Language:
- English
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