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quadrupole

Paper Title Other Keywords Page
TUPTPF013 Stripline Devices for FLASH and European XFEL dipole, kicker, impedance, pick-up 110
 
  • M.M. Dehler, G.J. Behrmann
    PSI, Villigen
  • M. Siemens, S. Vilcins
    DESY, Hamburg
  
 

Currently, a prototype fast intra bunch train feedback system is under development which is to be tested at FLASH. For pickups as well as kickers, stripline devices have been developed. The new pickup is based on the earlier designs used in the transfer lines of the swiss light source as well as in the proton cyclotron PROSCAN at PSI; in particular, the stripline electrode output coupling is intentionally mismatched in order to increase the shunt impedance seen by the beam. Two versions have been designed for a center frequency of 1.65 GHz and a loaded Q of 35. Prototypes have been fabricated and built into FLASH. The stripline kicker consists of four main elements (all in-vacuum): two stripline electrodes fabricated from extruded aluminum and two metallic ground planes, held in place by ceramic spacers. The latter reduce the mutual inductance between the electrodes and optimize the RF match for asymmetries in the RF feed. Prototypes have been built, measured in the lab, and are now in the process of being inserted into FLASH.

  
TUPTPF015 Suppression of Longitudinal Coupled-bunch Instabilities at the KEK-PF feedback, cavity, dipole, synchrotron 120
 
  • T. Obina, J.W. Flanagan, T. Honda, T.M. Mitsuhashi, M. Tadano, M. Tobiyama
    KEK, Ibaraki
  • W.X. Cheng, J.D. Fox
    SLAC, Menlo Park, California
  • D. Teytelman
    Dimtel, San Jose
  
 

A bunch-by-bunch feedback system has been developed to suppress longitudinal coupled-bunch instabilities at the KEK-PF. A generalpurpose signal processor, called iGp, has been developed by a collaboration among KEK, SLAC and INFN-LNF. A longitudinal kicker based on the DAΦNE-type over-damped cavity was designed and installed in the ring. The whole feedback loop was closed at the end of June 2007. The longitudinal dipole-mode instabilities are successfully suppressed up to 430 mA. The performance and the details of the system will be presented in this paper.

  
TUPTPF059 Coupling Correction in NSLS X-ray Ring coupling, feedback, storage-ring, monitoring 251
 
  • M.G. Fedurin, I. Pinayev
    BNL, Upton, Long Island, New York
  
 

In this paper we present algorithm of coupling correction in a storage ring based on monitoring the vertical size of a stored beam, while varying skew quadrupoles. The details of the algorithm realized as Matlab script and experimental results of its application are presented.