• 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.

• M. Wendt, A. Lunin, N. Solyak, V.P. Yakovlev
  Fermilab, Batavia
• N.C. Chritin, H. Schmickler, L. Søby
  CERN, Geneva

In the context of the development of a high resolution BPM system for the CLIC Main Linac we present the design of a cavity BPM prototype. It consists of a waveguide loaded dipole mode resonator and a monopole mode reference cavity, both operating at 15 GHz, to be compatible with the bunch frequencies at the CLIC Test Facility. Requirements, design concept, numerical analysis, and practical considerations are discussed.

• J. Steimel, V.E. Scarpine, R.C. Webber, M. Wendt
  Fermilab, Batavia

A linear accelerator test facility called HINS has been operating at Fermilab. The goal of this program is to test new technology for the front end of an intensity frontier linac. Some of the new technologies that will be tested include: operation of multiple cavities from a single RF source using high-power vector modulators, round beam transport using superconducting solenoidal focusing, accelerating beam with spoke cavities, and a transition to superconducting RF cavities at 10 MeV. The testing has been split into four different stages: 2.5 MeV beam out of the RFQ only, acceleration through 6 room temperature cavities with quadrupole focusing, acceleration through 18 room temperature cavities with solenoidal focusing, and acceleration through the room temperature section plus one cryomodule of superconducting spoke cavities. Each stage focuses on testing the beam quality with a particular new technology. This paper describes the instrumentation necessary to verify the specified beam quality for each stage of the program.