LINAC2026 - 33rd Linear Accelerator Conference

Low-power RF tuning of a transverse deflecting cavity using the Kyhl method

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC4.A07: Room temperature RF Poster Session

Speaker

Mr Geunwoo Kim (Pohang University of Science and Technology)

Description

S-band transverse deflecting cavity (TDC) system is being developed at Pohang Accelerator Laboratory (PAL) using its in-house brazing facility. This TDC will be employed for the longitudinal phase-space characterization of electron beams in the eLABs at PAL. TDCs require low-power RF tuning before high-power conditioning and beam operation because input-coupler-cell errors can affect both the reflection response and the deflecting-mode field distribution. This work reports low-power RF tuning and characterization of a transverse deflecting cavity based on vector network analyzer measurements of the complex S11 response, following the classical Kyhl procedure. The input-coupler cell was mechanically adjusted while selected mode frequencies and reflection responses were monitored. The measured RF response was compared with electromagnetic-simulation predictions to evaluate the consistency of the tuned condition with the expected cavity mode structure. The final input-coupler-cell setting was determined from the complex S11 response rather than from the reflection minimum alone. The resulting low-power tuned condition provides a basis for RF conditioning and beam operation.