Variable input coupler design for storage ring cavities

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Description

Magnetic loop type input couplers are used for coupling rf power from waveguides to the storage ring cavities: In a high rf power and high beam current accelerating cavity, the change in beam loading results in high reflected power due to input rf mismatch. The coupler can be matched for a specific loading condition, but cannot be matched in other conditions. The input mismatch results in poor rf power efficiency and overheating of the ceramic window in the coupler. Therefore, coupling through the coupling loop must be adjustable for maximum operating power efficiency and coupler reliability. The adjustment of coupling ... continued below

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4 p.

Creation Information

Kang, Y. W. & Kustom, R. L. August 18, 1995.

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Description

Magnetic loop type input couplers are used for coupling rf power from waveguides to the storage ring cavities: In a high rf power and high beam current accelerating cavity, the change in beam loading results in high reflected power due to input rf mismatch. The coupler can be matched for a specific loading condition, but cannot be matched in other conditions. The input mismatch results in poor rf power efficiency and overheating of the ceramic window in the coupler. Therefore, coupling through the coupling loop must be adjustable for maximum operating power efficiency and coupler reliability. The adjustment of coupling can be made by changing the magnetic flux linkage through the loop area. This can be done either mechanically by moving the coupling loop position or electronically by using impedance matching to change the properties of low loss material such as ferrite. In the existing coupler design, to change the coupling the coupler loop is turned physically for matching. The cavity vacuum must be broken and pumped down again; this can cause long system down time.

Physical Description

4 p.

Notes

OSTI as DE96004542

Source

  • Other Information: PBD: 18 Aug 1995

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  • Other: DE96004542
  • Report No.: LS--248
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/176794 | External Link
  • Office of Scientific & Technical Information Report Number: 176794
  • Archival Resource Key: ark:/67531/metadc671171

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 18, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

Description Last Updated

  • Dec. 16, 2015, 4:51 p.m.

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Kang, Y. W. & Kustom, R. L. Variable input coupler design for storage ring cavities, report, August 18, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc671171/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.