Piezoelectric Tuner Compensation of Lorentz Detuning in Superconducting Cavities
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 [1] with a reduction of the dynamic Lorentz detuning during the rf pulse by a factor of 3. We have also measured the amplitude and phase of the transfer function of the piezo control system (from input voltage to cavity frequency) up to several kHz [2].
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 811114
- Report Number(s):
- JLAB-ACP-03-79; DOE/ER/40150-2467; TRN: US0302995
- Resource Relation:
- Conference: PAC 2003, Seattle, WA (US), 05/12/2003--05/16/2003; Other Information: PBD: 12 May 2003
- Country of Publication:
- United States
- Language:
- English
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