External Q studies for APT superconducting cavity couplers

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Coupling coefficients for the APT superconducting cavity couplers have been predicted using an improvement of the method previously developed for the French Trispal project. The authors here present the method and a proof of the formula used to compute the external Q. Measurements on a single-cell copper cold model exhibited a very good agreement against simulation. Then, they established that the original coupler design lead to an insufficient coupling in {beta} = 0.64 cavities. Different solutions were proposed to fix this problem, like combining impedance discontinuities in the line and an off-centered disc end tip. Finally, it was decided to ... continued below

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16 p.

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Balleyguier, P. December 31, 1998.

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Description

Coupling coefficients for the APT superconducting cavity couplers have been predicted using an improvement of the method previously developed for the French Trispal project. The authors here present the method and a proof of the formula used to compute the external Q. Measurements on a single-cell copper cold model exhibited a very good agreement against simulation. Then, they established that the original coupler design lead to an insufficient coupling in {beta} = 0.64 cavities. Different solutions were proposed to fix this problem, like combining impedance discontinuities in the line and an off-centered disc end tip. Finally, it was decided to increase the beam tube diameter though it has some influence on the cavity end-cell performance.

Physical Description

16 p.

Notes

INIS; OSTI as DE99001232

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  • 19. international linac conference, Chicago, IL (United States), 23-28 Aug 1998

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  • Other: DE99001232
  • Report No.: LA-UR--98-2424
  • Report No.: CONF-980827--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 296807
  • Archival Resource Key: ark:/67531/metadc677628

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  • December 31, 1998

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 4:39 p.m.

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Balleyguier, P. External Q studies for APT superconducting cavity couplers, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc677628/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.