Planar Waveguide Hybrids for Very High Power RF

Technical Report · Mon May 10 04:00:00 EDT 1999

DOI:https://doi.org/10.2172/784859· OSTI ID:784859

Nantista, Christopher D ^[1]

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1. SLAC

Two basic designs have been developed for waveguide hybrids, or 3-dB couplers, capable of handling hundreds of megawatts at X-band. Coupling is provided by one or two connecting waveguides with h-plane junctions and matching elements. In the former case, the connecting waveguide supports two modes. Small apertures and field-enhancing e-bends are avoided to reduce the risk of rf breakdown. The h-plane symmetry also allows the use of over-moded rectangular waveguide in which the height has been increased to reduce field amplitudes without affecting the scattering matrix. The theory and designs are presented, along with the results of prototype tests of functionality and power-handling capability. Such a device is integral to the rf pulse compression or power distribution system [2] of the Next Linear Collider (NLC) [1] for combining, splitting, and directing power. This work was motivated by the observation of rf breakdown at power levels above 200 MW in conventional and modified magic-T's.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (US)
• Sponsoring Organization: USDOE Office of Energy Research (ER) (US)
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 784859
• Report Number(s): SLAC-PUB-8142
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
BREAKDOWN
DESIGN
LINEAR COLLIDERS
POWER DISTRIBUTION SYSTEMS
RF SYSTEMS
WAVEGUIDES