Author: Cornacchia, M.
Paper Title Page
WEP15 Tools for Analysis and Improvement of Linac Optics Design for High Brightness Electron Beams 170
 
  • S. Di Mitri, M. Cornacchia, C. Scafuri
    ELETTRA, Basovizza, Italy
 
  The optics design of single pass high brightness electron linacs usually aims at the preservation of the transverse emittance. Collective effects mainly impose constraints to the optics design such as at the low-beta interaction points in colliders and magnetic compressors in FELs. Other constraints are from the trajectory correction scheme, performance of diagnostics, collimation systems and physical space limitations. Strong focusing is typically prescribed for all the aforementioned cases, although it may hamper the main goal of emittance preservation through the excitation of optical aberrations. Strong focusing also potentially leads, through focusing errors, to large beam optics mismatch. Based on these sometimes conflicting requirements, we have developed tools for the analysis and improvement of electron linac optics. They are based on the Elegant [1] code and allow the user to identify:
  1. local sources of phase space distortions and emittance dilution,
  2. lattice areas particularly sensitive to focusing errors,
  3. poor trajectory steering.
The analysis does not require massive particle tracking since it deals with the single particle motion in the normalized phase space.

[1] M. Borland, Advanced Photon Source LS-287 (2000).