• 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.