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Blednykh, A.

Paper Title Page
TUPMS074 Collective Effects in the NSLS-II Storage Ring 1344
 
  • S. Krinsky, J. Bengtsson, J. S. Berg, M. Blaskiewicz, A. Blednykh, W. Guo, N. Malitsky, C. Montag, B. Podobedov, J. Rose, N. A. Towne, L.-H. Yu
    BNL, Upton, Long Island, New York
  • F. Wang
    MIT, Middleton, Massachusetts
  
  Funding: This work was supported by Department of Energy contract DE-AC02-98CH10886.

A new high-brightness synchrotron light source (NSLS-II) is under design at BNL. The 3-GeV NSLS-II storage ring has a double-bend achromatic lattice with damping wigglers installed in zero-dispersion straights to reduce the emittance below 1nm. In this note, we present an overview of the impact of collective effects upon the performance of the storage ring. Subjects discussed include Touschek lifetime, intra-beam scattering, instability thresholds due to ring impedance, and use of a third-harmonic Landau cavity.

 
WEPMS091 Conceptual Design of the NSLS-II RF Systems 2550
 
  • J. Rose, A. Blednykh, W. Guo, P. Mortazavi, N. A. Towne
    BNL, Upton, Long Island, New York
  
  RF system requirements are derived from machine parameters and beam stability specifications. The conceptual design of the RF system for NSLS-II to meet these requirements is presented, consisting of 500 MHz superconducting main cavities, 1500 MHz SCRF harmonic cavities for bunch lengthening, and the RF power and cryogenic systems.  
FRPMS102 Preliminary Impedance Budget for the NSLS-II Storage Ring 4321
 
  • A. Blednykh, S. Krinsky
    BNL, Upton, Long Island, New York
  
  Extensive calculations have been performed of the wakefield and impedance produced by the storage ring components for the rms bunch length of 3mm. Calculated data are presented for the NSLS-II storage ring components such as dipole vacuum chamber, quadrupole vacuum chamber, sextupole vacuum chamber, tapered elliptic vacuum chamber for superconducting undulator, cryo permanent magnet mini-gap undulator, CESR-B RF cavity, beam position monitor, infrared beam extraction chamber and resistive wall. The loss factor, the kick factor and imaginary part of the longitudinal impedance at low frequency divided by harmonic number are given per component and have been entered into a table.  
FRPMS103 Coupling Impedance of the CESR-B RF Cavities for the NSLS-II Storage Ring 4327
 
  • A. Blednykh, S. Krinsky, J. Rose
    BNL, Upton, Long Island, New York
  
  CESR-B type superconducting cavities are under discussion for acceleration of the electron beam in the 3-GeV NSLS-II storage ring. In this paper we present a detailed investigation of longitudinal and transverse impedances of the cavity and transition assembly. Ferrite material is included in impedance analysis. Its effect on the short range wakepotential has been studied using the GdfidL code. Results of loss factors and kick factors are presented for a 3mm rms bunch length.  
FRPMS104 Impedance of Electron Beam Vacuum Chambers for the NSLS-II Storage Ring 4333
 
  • A. Blednykh, S. Krinsky
    BNL, Upton, Long Island, New York
  
  In this paper we discuss computation of the coupling impedance of the vacuum chambers for the NSLS-II storage ring using the electromagnetic simulator GdfidL. The impedance of the vacuum chambers depends on the geometric dimensions of the cross-section and height of the slot in the chamber wall. Of particular concern is the complex geometry of the infrared extraction chambers to be installed in special large-gap dipole magnets. In this case, wakefields are generated due to tapered transitions and large vertical-aperture ports with mirrors near the electron beam.