Development of the SCRF Power Coupler for the APT Accelerator

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The team responsible for the design of the Accelerator Production of Tritium (APT) superconducting (SC) radio frequency (RF) power coupler has developed two 700-MHz, helium gas-cooled power couplers. One has a fixed inner conductor and the other has an adjustable inner conductor (gamma prototype and alpha prototype). The power couplers will be performance tested in the near future. This paper discusses the mechanical design and fabrication techniques employed in the development of each power coupler. This includes material selection, copper coating, assembly sequences, and metal joining procedures, as well as the engineering analyses performed to determine the dynamic response of ... continued below

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Schmierer, E. N.; Lujan, R. E.; Rusnak, B.; Smith, B.; Haynes, W. B.; Gautier, C. et al. March 1999.

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The team responsible for the design of the Accelerator Production of Tritium (APT) superconducting (SC) radio frequency (RF) power coupler has developed two 700-MHz, helium gas-cooled power couplers. One has a fixed inner conductor and the other has an adjustable inner conductor (gamma prototype and alpha prototype). The power couplers will be performance tested in the near future. This paper discusses the mechanical design and fabrication techniques employed in the development of each power coupler. This includes material selection, copper coating, assembly sequences, and metal joining procedures, as well as the engineering analyses performed to determine the dynamic response of the inner conductors due to environmental excitations. A bellows is used in both prototype inner conductors in the area near the ceramic RF window, to compensate for thermal expansion and mechanical tolerance build-up. In addition, a bellows is used near the tip of the inner conductor of the alpha prototype for running the power coupler after it is installed on the accelerator. Extensive analytical work has been performed to determine the static loads transmitted by the bellows due to thermally induced expansion on the inner conductor and on the RF window. This paper also discusses this analysis, as well as the mechanical analysis performed to determine the final geometric shape of the bellows. Finally, a discussion of the electromagnetic analysis used to optimize the performance of the power couplers is included.

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Medium: P; Size: vp.

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INIS; OSTI as DE00757277

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  • Particle Accelerator, New York, NY (US), 03/1999

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  • Report No.: LA-UR-99-1313
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 757277
  • Archival Resource Key: ark:/67531/metadc703073

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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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  • March 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 6, 2016, 3:16 p.m.

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Schmierer, E. N.; Lujan, R. E.; Rusnak, B.; Smith, B.; Haynes, W. B.; Gautier, C. et al. Development of the SCRF Power Coupler for the APT Accelerator, article, March 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc703073/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.