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Cliffer, N.T.

Paper Title Page
TPPT095 Test of a Fast Ferrite Reactive Tuner for Control of Microphonics at the S-Dalinac
 
  • T. Zwart, dc. Cheever, N.T. Cliffer, M. Farkhondeh, W. Graves, W. North, C. Tschalaer, D. Wang, D. Wang, F. Wang, A. Zolfaghari, J. van der Laan
    MIT, Middleton, Massachusetts
  • H.-D. Gräf
    TU Darmstadt, Darmstadt
 
  Funding: DOE

A fast ferrite inductive tuner assembly has been constructed for use at the 3 GHz superconducting S-Dalinac accelerator. This device was installed and tested at the S-Dalinac in April 2005. At a fixed accelerating field of 1.4 MV/m using a simple analog control loop the amplitude of the cavity peak-to-peak phase fluctuations with respect to the phase of the incident RF was reduced from 80 degrees to 10 degrees. The 50 Hz noise which dominated the open loop microphonics was reduced by more than 30 dB. The open loop response of the reactive tuner has also been characterized, yielding a tuning range of ?f greater than 300 Hz at a Qext of 1.5e7. The ferrite tuner was then relocated on the waveguide to a distance of (n+1/4)? from the input coupler. This allowed fast control of the coupling with range of Qext from 1.5 - 8e7.