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SRF2003 Show Abstract


Title PIEZOELECTRIC TUNER COMPENSATION OF LORENTZ DETUNING IN SUPERCONDUCTING CAVITIES
Type Poster coupler / tuner / controls
Abstract Pulsed operation of superconducting cavities can induce large variations of the resonant frequency through excitation of the mechanical modes by the radiation pressure.  The phase and amplitude control system must be able to accommodate this frequency variation; this can be accomplished by increasing the capability of the rf power source.  Alternatively, a piezo electric tuner can be activated at the same repetition rate as the rf to counteract the effect of the radiation pressure.  We have demonstrated such a system on the prototype medium beta SNS cryomodule with a reduction of the dynamic Lorentz detuning during the rf pulse by a factor of 3.  Piezo electric tuners can also be used to reduce the level of microphonics in low-current cw accelerators, and we have measured the amplitude and phase of the transfer function of the piezo control system (from input voltage to cavity frequency) up to several kHz.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Delayen J. R. JLab
Davis G. K. JLab



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