• G. Velev, J. DiMarco, C.C. Drennan, D.J. Harding, V.S. Kashikhin, O. Kiemschies, S. Kotelnikov, J.R. Lackey, A.V. Makarov, A. Makulski, R. Nehring, D.F. Orris, W. Pellico, E. Prebys, P. Schlabach, D.G.C. Walbridge
  Fermilab, Batavia

Funding: Work supported by the U.S. Department of Energy

The fabrication of the multi-element corrector magnets for the Fermilab Booster synchrotron has just been completed. These water-cooled packages include six different corrector types - normal and skews oriented dipole, quadrupole and sextupole elements. They will provide full orbit control, tune and chromaticity of the beam over the whole range of Booster energies, from 0.4 GeV to 8 GeV. During production, a set of quality assurance measurements were performed, including special thermal tests. This paper summarizes the results from these measurements as well as discussing some specific steps of the magnet fabrication process.

• V.S. Kashikhin, E. Borissov, G.W. Foster, T.N. Khabiboulline, A. Makulski, Y.M. Pischalnikov
  Fermilab, Batavia

Funding: Department of Energy, U.S.A.

A novel prototype of SCRF cavity tuner is being designed and tested at Fermilab. This is a superconducting C-type iron dominated magnet having a 10 mm gap, axial symmetry, and a 1 Tesla field. Inside the gap is mounted a superconducting coil capable of moving ± 1 mm and producing a longitudinal force up to ± 1.5 kN. The static force applied to the RF cavity flanges provides a long- term cavity geometry tuning to a nominal frequency. The same coil powered by a fast AC current pulse delivers mechanical perturbation for fast cavity tuning. This fast mechanical perturbation could be used to compensate a dynamic RF cavity detuning caused by cavity Lorentz forces and microphonics. A special configuration of magnet system was designed and tested.

• R.H. Carcagno, T.N. Khabiboulline, S. Kotelnikov, A. Makulski, R. Nehring, J.M. Nogiec, M.C. Ross, W. Schappert
  Fermilab, Batavia
• A. Goessel, J. Iversen, D. Klinke, G. Kreps, W.-D. Möller, C. Mueller, D. Proch, J.H. Thie
  DESY, Hamburg

A series of four automatic tuning machines for 9-cell TESLA-type cavities are being developed and fabricated through a collaboration between DESY, FNAL and KEK. These machines are intended to support high-throughput cavity fabrication for construction of large SRF-based accelerator projects. Two of these machines will be delivered to cavity vendors for the tuning of XFEL cavities. The control system for these machines must support a high level of automation adequate for industrial use by non-expert operators. This paper describes the control system hardware and software designs, and shows preliminary results obtained with a tuning machine prototype.

• Y.M. Pischalnikov, R.H. Carcagno, A. Makulski, D.F. Orris, W. Schappert
  Fermilab, Batavia

Funding: Work supported by U.S. Department of Energy under contract DE-AC02-76CH03000

Progress has been made at Fermilab on the development of feed-forward and feed-back algorithms used to compensate SCRF cavity detuning, which is caused by Lorentz Forces and microphonics. Algorithms that have been developed and tested for the 1.3GHz (ILC-style) SCRF cavities (Capture Cavity II) will be reported.