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Baboi, N.

Paper Title Page
CT11 Beam Based HOM Analysis of Acceleating Structures at the TESLA Test Facility LINAC 83
 
  • M. Wendt, S. Schreiber, A. Gössel
    DESY, Deutsches Elektronen-Synchrotron, Hamburg, Germany
  • M. Hüning
    FNAL, Fermi National Accelerator Laboratory, Batavia, IL, USA
  • G. Devanz, M. Jablonka, C. Magne, O. Napoly
    CEA, Commissariat à l'Energie Atomique, Saclay, France
  • N. Baboi* (on leave from NTLPRP)
    SLAC, Stanford Linear Accelerator, Stanford, CA, USA
 
  The beam emittance in future linear accelerators for high energy physics and SASE-FEL applications depends highly on the field performance in the accelerating structures, i.e. the damping of higher order modes (HOM). Besides theoretical and laboratory analysis (network analyzer), a beam based analysis technique was established [S. Fartoukh, et.al., Proceedings of the PAC99 Conference] at the TESLA Test Facility (TTF) linac. It uses a charge modulated beam of variable modulation frequency to excite dipole modes. This causes a modulation of the transverse beam displacement, which is observed at a downstream BPM and associated with a direct analysis of the modes at the HOM couplers. Emphasis of this presentation is put on beam instrumentation and signal analysis aspects. A brief introduction of eigenmodes in resonant structures, as well as some interesting measurement results are further presented.