Space charge and beam stability of the proposed Fermilab proton driver in Phase I

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Issues concerning beam stability of the proposed Fermi-lab proton driver are studied in its Phase I. Although the betatron tune shifts are dominated by space charge, these shifts are less than 0.25 and will therefore not drive the symmetric and antisymmetric modes of the beam envelope into instability. The longitudinal space-charge force is large and inductive inserts may be needed to compensate for the distortion of the rf potential. Although the longitudinal impedance is space-charge dominated, it will not drive any microwave instability, unless the real part of the impedance coming from the inductive inserts and wall resistivity of the ... continued below

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92 Kilobytes pages

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Zotter, K. Y. Ng and B. July 20, 2001.

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Issues concerning beam stability of the proposed Fermi-lab proton driver are studied in its Phase I. Although the betatron tune shifts are dominated by space charge, these shifts are less than 0.25 and will therefore not drive the symmetric and antisymmetric modes of the beam envelope into instability. The longitudinal space-charge force is large and inductive inserts may be needed to compensate for the distortion of the rf potential. Although the longitudinal impedance is space-charge dominated, it will not drive any microwave instability, unless the real part of the impedance coming from the inductive inserts and wall resistivity of the beam tube are large enough. The design of the beam tube is therefore very important in order to limit the flow of eddy current and keep wall resistivity low. The transverse impedance is also space-charge dominated. With the proton driver operated at an imaginary transition gamma, however, Landau damping will never be canceled and beam stability can be maintained with negative chromaticities.

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92 Kilobytes pages

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  • Particle Accelerator Conference 2001, Chicago, IL (US), 06/18/2001--06/22/2001

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  • Report No.: FERMILAB-Conf-01/200-T
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 783068
  • Archival Resource Key: ark:/67531/metadc718619

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Office of Scientific & Technical Information Technical Reports

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

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  • July 20, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 1, 2016, 4:59 p.m.

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Zotter, K. Y. Ng and B. Space charge and beam stability of the proposed Fermilab proton driver in Phase I, article, July 20, 2001; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc718619/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.