Lorentz force detuning analysis of the Spallation Neutron Source (SNS) accelerating cavities.

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The Spallation Neutron Source (SNS) project incorporates a superconducting radio-frequency (SRF) accelerator for the final section of the pulsed mode linac. Cavities with geometrical {beta} values of {beta}=0.61 and {beta}=0.81 are utilized in the SRF section, and are constructed out of thin-walled niobium with stiffener rings welded between the cells near the iris. The welded titanium helium vessel and tuner assembly restrains the cavity beam tubes. Cavities with {beta} values less than one have relatively steep and flat side-walls making the cavities susceptible to Lorentz force detuning. In addition, the pulsed RF induces cyclic Lorentz pressures that mechanically excite the ... continued below

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7 p.

Creation Information

Mitchell, Russell R.; Matsumoto, Kay Yuri; Ciovati, Gianluigi; Davis, Kirk; Macha, Kurt & Sundelin, Ronald M. January 1, 2001.

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Description

The Spallation Neutron Source (SNS) project incorporates a superconducting radio-frequency (SRF) accelerator for the final section of the pulsed mode linac. Cavities with geometrical {beta} values of {beta}=0.61 and {beta}=0.81 are utilized in the SRF section, and are constructed out of thin-walled niobium with stiffener rings welded between the cells near the iris. The welded titanium helium vessel and tuner assembly restrains the cavity beam tubes. Cavities with {beta} values less than one have relatively steep and flat side-walls making the cavities susceptible to Lorentz force detuning. In addition, the pulsed RF induces cyclic Lorentz pressures that mechanically excite the cavities, producing a dynamic Lorentz force detuning different from a continuous RF system. The amplitude of the dynamic detuning for a given cavity design is a function of the mechanical damping, stiffness of the tuner/helium vessel assembly, RF pulse profile, and the RF pulse rate. This paper presents analysis and testing results to date, and indicates areas where more investigation is required.

Physical Description

7 p.

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  • Submitted to: The 10th Workshop on Radio Frequency Superconductivity, September 8, 2001, Tsukuba City, Japan.

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  • Report No.: LA-UR-01-5095
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975742
  • Archival Resource Key: ark:/67531/metadc925999

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 2001

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 12:21 p.m.

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Mitchell, Russell R.; Matsumoto, Kay Yuri; Ciovati, Gianluigi; Davis, Kirk; Macha, Kurt & Sundelin, Ronald M. Lorentz force detuning analysis of the Spallation Neutron Source (SNS) accelerating cavities., article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc925999/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.