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cryomodule

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TUPSM031 A Wire Position Monitor System for Superconducting Cryomodules at Fermilab pick-up, alignment, controls, coupling 187
 
  • D.H. Zhang, N. Eddy, B.J. Fellenz, J. Fitzgerald, P.S. Prieto, A. Saewert, A. Semenov, D.C. Voy, M. Wendt
    Fermilab, Batavia
  
 

Fermilab is jointly developing capabilities in high gradient and high Q superconducting accelerator structures based on the 1.3 GHz TESLA technology. Based on an INFN/TESLA design, a wire-position-monitor (WPM) system is integrated to monitor cavity alignment and cold mass vibrations. The system consists of a reference wire carrying a 325 MHz signal, 7 stripline pickups (per cryomodule), and read-out electronics using direct digital signal down-conversion techniques. We present technical details of the system, and preliminary results on resolution and stability measured at a mock-up test stand.

  
TUPSM038 Status of the Re-Entrant Cavity Beam Position Monitor for the European XFEL Project cavity, linac, dipole, controls 210
 
  • C.S. Simon, O. Napoly
    CEA, Gif-sur-Yvette
  • J.-P. Prestel, N. Rouvière
    IPN, Orsay
  
 

The European XFEL is a research facility, currently under construction in Germany. It is based on a superconducting electron linac including about 100 cryomodules based on the TESLA technology. Each cryomodule is equipped with a beam position monitor connected to a quadrupole at the high-energy end of the cavity string. Around one third of cold BPMs will be re-entrant RF cavities. This contribution will describe the present status of the cold re-entrant cavity BPM, and will present measurements of the BPM pickup and electronics prototypes.