1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

RF window ghost mode analysis

WEPS135
4 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC7.T06 Normal Conducting RF Wednesday Poster Session

Speaker

Liling Xiao (SLAC National Accelerator Laboratory)

Description

The RF window acts as a barrier between the vacuum and air, gas, or water while allowing RF power to pass through with minimal loss. Resonant modes (called "ghost modes") can occur within the ceramic disk of a window. The frequencies of these modes depend on the material and size of the ceramic. Ceramic disk dimensions must be carefully optimized to minimize reflections and avoid ghost mode resonances within the operating bandwidth. In this paper we present the design of an input window used in an X-band klystron. The dimensions of the window and ceramic disk are optimized to minimize insertion and reflection losses while preventing ghost mode resonances in the operating bandwidth. In addition to this, we ensure that the maximum electric field at the window surface is kept low to reduce the probability of RF breakdowns. Analytical analysis, numerical simulations and experimental measurements of the ghost modes of ceramic disks were carried out. The measured ghost mode frequency was used to evaluate the ceramic dielectric constant. In this article we present simulated and measured results.

Region represented America
Paper preparation format Word

Author

Liling Xiao (SLAC National Accelerator Laboratory)

Co-author

Valery Dolgashev (SLAC National Accelerator Laboratory)

Presentation materials

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