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

A study of improving stability and reliability in PAL-XFEL modulator system

TUPM018
3 Jun 2025, 16:00
2h
Exhibiton Hall A _Magpie (TWTC)

Exhibiton Hall A _Magpie

TWTC

Poster Presentation MC2.A08 Linear Accelerators Tuesday Poster Session

Speaker

Sang-Hee Kim (Pohang Accelerator Laboratory)

Description

In the PAL-XFEL system, an X-ray free electron laser facility, 51 modulator power supplies in total have been operated with thyratron tubes as the high voltage pulse switch devices in order to drive an X-band linearize and 50 S-band klystrons for a beam energy of 10 GeV. PAL-XFEL requires beam energy stability of less than 0.02% and very tight control of the klystron RF phase jitter. The modulator output pulse amplitude stability is directly related to the RF phase jitter. There are several factors to satisfy stability and reliability for the PAL-XFEL modulator. The largest sources of pulse-to-pulse instability are a current charging power supply (CCPS) for PFN charging, thyratron switch parts, and a klystron focusing magnet power supply. This paper describes how to deal with the failures of these devices and the debugging results.

Region represented Asia
Paper preparation format Word

Author

Sang-Hee Kim (Pohang Accelerator Laboratory)

Co-author

Chang-Ki Min (Pohang Accelerator Laboratory)

Presentation materials

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