Development of the SCRF Power Coupler for the APT Accelerator

Conference · Mon Mar 01 04:00:00 EST 1999

OSTI ID:757277

Schmierer, E N; Lujan, R E; Rusnak, B; Smith, B; Haynes, W B; Gautier, C; Waynert, J A; Krawczyk, F; Gioia, J

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.

• Research Organization: Los Alamos National Lab., NM (US)
• Sponsoring Organization: USDOE Office of Defense Programs (DP) (US)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 757277
• Report Number(s): LA-UR-99-1313
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATOR DRIVEN TRANSMUTATION
DESIGN
FABRICATION
ISOTOPE PRODUCTION
POWER SUPPLIES
RF SYSTEMS
SUPERCONDUCTING DEVICES
TRITIUM