Measurement of input coupler matching of a loaded storage ring single-cell cavity

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Description

In the APS storage ring cavities, magnetic loop type input couplers are used. The loaded Q of a cavity varies as the beam loading changes. The beam loading changes the cavity input impedance. Therefore, the input coupler must be adjusted to maintain a good impedance match. Measurements have been made to determine the coupler loop position (depth of penetration) with respect to various loading conditions in a storage ring single-cell cavity. An input coupler was inserted into the storage ring single-cell cavity at various loaded Q points, then matched. The relationship between the coupling coefficient, {Beta}, and the gap width, ... continued below

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5 p.

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Cho, J.W. & Kang, Y. August 14, 1995.

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Description

In the APS storage ring cavities, magnetic loop type input couplers are used. The loaded Q of a cavity varies as the beam loading changes. The beam loading changes the cavity input impedance. Therefore, the input coupler must be adjusted to maintain a good impedance match. Measurements have been made to determine the coupler loop position (depth of penetration) with respect to various loading conditions in a storage ring single-cell cavity. An input coupler was inserted into the storage ring single-cell cavity at various loaded Q points, then matched. The relationship between the coupling coefficient, {Beta}, and the gap width, where gap width is the separation between the input coupler flange and the cavity port flange, was studied. A coupling coefficient is defined where Q{sub O} is the unloaded Q and Q{sub L} is the loaded Q, repectively. Depending on the extent of deQing of the fundamental mode in the single-cell cavity, the input coupler was positioned further in or out of the cavity accordingly to achieve matching at 50 {Omega}. Damping the cavity simulates the beam loading when the beam passes through the single-cell cavities.

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5 p.

Notes

OSTI as DE96004543

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  • Other Information: PBD: 14 Aug 1995

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  • Other: DE96004543
  • Report No.: LS--247
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/176793 | External Link
  • Office of Scientific & Technical Information Report Number: 176793
  • Archival Resource Key: ark:/67531/metadc665864

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • August 14, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Dec. 14, 2015, 4:53 p.m.

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Cho, J.W. & Kang, Y. Measurement of input coupler matching of a loaded storage ring single-cell cavity, report, August 14, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc665864/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.