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Title: Piezoelectric Tuner Compensation of Lorentz Detuning in Superconducting Cavities

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. 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.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
816433
Report Number(s):
JLAB-ACP-03-189; DOE/ER/40150-2551
TRN: US0305023
DOE Contract Number:  
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: 11th Workshop on RF Superconductivity, Travenmunde, Lubeck (DE), 09/08/2003--09/12/2003; Other Information: PBD: 1 Sep 2003
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; AMPLITUDES; CAVITIES; CONTROL SYSTEMS; EXCITATION; RADIATION PRESSURE; SUPERCONDUCTIVITY; TRANSFER FUNCTIONS

Citation Formats

Jean Delayen, and G. Davis. Piezoelectric Tuner Compensation of Lorentz Detuning in Superconducting Cavities. United States: N. p., 2003. Web.
Jean Delayen, & G. Davis. Piezoelectric Tuner Compensation of Lorentz Detuning in Superconducting Cavities. United States.
Jean Delayen, and G. Davis. Mon . "Piezoelectric Tuner Compensation of Lorentz Detuning in Superconducting Cavities". United States. https://www.osti.gov/servlets/purl/816433.
@article{osti_816433,
title = {Piezoelectric Tuner Compensation of Lorentz Detuning in Superconducting Cavities},
author = {Jean Delayen and G. Davis},
abstractNote = {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. 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {9}
}

Conference:
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