Physical Review Accelerators and Beams (Jan 2017)

Vertically polarizing undulator with dynamic compensation of magnetic forces

  • N. Strelnikov,
  • I. Vasserman,
  • J. Xu,
  • D. Jensen,
  • O. Schmidt,
  • E. Trakhtenberg,
  • K. Suthar,
  • E. R. Moog,
  • G. Pile,
  • E. Gluskin

DOI
https://doi.org/10.1103/PhysRevAccelBeams.20.010701
Journal volume & issue
Vol. 20, no. 1
p. 010701

Abstract

Read online Read online

As part of the R&D program of the LCLS-II project, a novel 3.4-meter-long undulator prototype with horizontal magnetic field and dynamic force compensation has recently been developed at the Advanced Photon Source (APS). Previous steps in this development were the shorter 0.8-meter-long and 2.8-meter-long prototypes. Extensive mechanical and magnetic testing were carried out for each prototype, and each prototype was magnetically tuned using magnetic shims. The resulting performance of the 3.4-meter-long undulator prototype meets all requirements for the LCLS-II insertion device, including limits on the field integrals, phase errors, higher-order magnetic moments, and electron-beam trajectory for all operational gaps, as well as the reproducibility and accuracy of the gap settings.