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Title: Mechanical properties of spoke resonators.

Abstract

No abstract prepared.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
947965
Report Number(s):
ANL/PHY/CP-117143
TRN: US200905%%41
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Journal Name: Physica C; Journal Volume: 441; Journal Issue: 2006; Conference: 12th International Workshop on RF Superconductivity (SRF2005); Jul. 10, 2005 - Jul. 15, 2005; Ithaca, NY
Country of Publication:
United States
Language:
ENGLISH
Subject:
42 ENGINEERING; MECHANICAL PROPERTIES; RESONATORS; SUPERCONDUCTIVITY

Citation Formats

Conway, Z. A., Shepard, K. W., Kelly, M. P., Fuerst, J. D., Kedzie, M., and Physics. Mechanical properties of spoke resonators.. United States: N. p., 2006. Web.
Conway, Z. A., Shepard, K. W., Kelly, M. P., Fuerst, J. D., Kedzie, M., & Physics. Mechanical properties of spoke resonators.. United States.
Conway, Z. A., Shepard, K. W., Kelly, M. P., Fuerst, J. D., Kedzie, M., and Physics. Sun . "Mechanical properties of spoke resonators.". United States. doi:.
@article{osti_947965,
title = {Mechanical properties of spoke resonators.},
author = {Conway, Z. A. and Shepard, K. W. and Kelly, M. P. and Fuerst, J. D. and Kedzie, M. and Physics},
abstractNote = {No abstract prepared.},
doi = {},
journal = {Physica C},
number = 2006,
volume = 441,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

Conference:
Other availability
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  • This paper presents experimental data characterizing the electro-mechanical properties of superconducting spoke-loaded cavities developed for high-intensity ion-linac applications, such as the cw ANL Advanced Exotic Beams Laboratory (AEBL) driver linac and the pulsed FNAL High Intensity Neutrino Source (HINS, now project X) proton driver linac. High-gradient cw operation at 4.2 K can produce violent boiling in the liquid helium coolant causing microphonic frequency noise. A spoke cavity designed to minimize the effects of helium pressure on RF eigenfrequency, the total microphonic induced RF frequency variations, were found to be on the level of the phase noise in the reference oscillator.more » To determine the pulsed cavity RF performance, the Lorentz transfer function was measured and used to predict the dynamic detuning in pulsed operation. There is good agreement between the predicted fit and the measured data, demonstrating the utility of the Lorentz transfer function, which can compl« less
  • This paper presents experimental data characterizing the electro-mechanical properties of superconducting spoke-loaded cavities developed for high-intensity ion-linac applications, such as the cw ANL Advanced Exotic Beams Laboratory (AEBL) driver linac and the pulsed FNAL High Intensity Neutrino Source (HINS, now project X) proton driver linac. High-gradient cw operation at 4.2 K can produce violent boiling in the liquid helium coolant causing microphonic frequency noise. A spoke cavity designed to minimize the effects of helium pressure on RF eigenfrequency, the total microphonic induced RF frequency variations, were found to be on the level of the phase noise in the reference oscillator.more » To determine the pulsed cavity RF performance, the Lorentz transfer function was measured and used to predict the dynamic detuning in pulsed operation. There is good agreement between the predicted fit and the measured data, demonstrating the utility of the Lorentz transfer function, which can completely characterize the dynamics of the coupling between the mechanical cavity structure and the cavity RF field due to the Lorentz force.« less
  • The proposed 8-GeV driver at FNAL is based on approximately 400 independently phased SC resonators. In this paper the design of 325 MHz Spoke Resonators, two single spoke resonators ({beta}=0.22 and {beta}=0.4) and a triple spoke resonator ({beta}=0.62), for the High Intensity Neutrino Source (HINS) front end is presented. We describe the optimization of the spoke resonators geometry, the goal being to minimize the E{sub peak}/E{sub acc} and B{sub peak}/E{sub acc} ratios. We report on the coupled ANSYS-MWS analysis on the resonators mechanical properties and power coupler RF design. The current status of mechanical design, slow tuning mechanism and cryostatmore » are also presented.« less
  • Superconducting RF structures such as spoke resonators [1] have been developed which will accelerate very low velocity ions. This opens up the possibility for the use of these resonators in high power proton accelerators at energies as low as the output energies of typical RFQs. Most similar resonators have been used for the acceleration of ions requiring only low RF power input. In new applications such as for the Accelerator Transmutation of Nuclear Wastes (ATW) and Accelerator Production of Tritium (APT), higher RF power will be required because of the larger beam currents. This paper discusses some higher power variablemore » coupler concepts that could be used with these structures.« less