Phase Slip in an Undulator with Pole and BPM Errors

Technical Report · Mon Jun 25 00:00:00 EDT 2001

DOI:https://doi.org/10.2172/784934· OSTI ID:784934

Emma, Paul J

A statistical analysis of a corrected electron trajectory through a planar FEL undulator is used to predict the optimal beam position monitor (BPM) spacing. The undulator is composed of modular sections, each containing many dipoles with random field and roll angle errors. Located between each section are inaccurate BPMs, steering correctors, and possibly quadrupole magnets. An analytical formula for electron-to-photon phase errors is derived and used to estimate the best BPM spacing. The results are applied to the LCLS FEL undulator [LCLS Design Study Report, SLAC-R-521, April 1998], which has demanding requirements on electron trajectory straightness.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 784934
• Report Number(s): SLAC-PUB-8852; TRN: US0108706
• Resource Relation: Other Information: PBD: 25 Jun 2001
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BEAM POSITION
DESIGN
DIPOLES
ELECTRON BEAMS
BEAM MONITORS
QUADRUPOLES
SLIP
WIGGLER MAGNETS
FREE ELECTRON LASERS
POSITIONING