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Podobedov, B.

Paper Title Page
THPCH080 Transverse Impedance of Small-gap Undulators for NSLS-II 2970
 
  • A. Blednykh, S. Krinsky, B. Podobedov, J.-M. Wang
    BNL, Upton, Long Island, New York
 
  We discuss the transverse impedance resulting from the use of small-gap undulators in the proposed NSLS-II storage ring. For superconducting undulators, the impedance arises due to the tapered elliptical vacuum chamber. For in-vacuum permanent magnet devices, the impedance results from a more complex geometry. We consider both cases and report results obtained using the electromagnetic simulation program GdfidL.  
THPCH081 Transverse Impedance of Elliptical Cross-section Tapers 2973
 
  • B. Podobedov, S. Krinsky
    BNL, Upton, Long Island, New York
 
  We investigate the transverse impedance of elliptical cross-section tapers. Analytical estimates for the dipole and quadrupolar components of the impedance at low frequency are obtained by extending a perturbation approach introduced by Stupakov. The perturbation theory results are compared to EM code GdfidL and are found to be in excellent agreement.