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Description
PAL-XFEL is preparing for a two-bunch operation, in which two electron bunches separated by 25 ns are accelerated within a single RF field. This mode enables simultaneous 60 Hz operation for two beamlines without the need for additional accelerating structures. To support this operation, a UV laser system capable of generating two temporally separated pulses was developed. The system utilizes an in-line third-harmonic generation (THG) setup with optical delay lines and polarization-based beam splitting to produce two UV pulses with a 25 ns separation. The measured pulse energies were approximately 120 µJ after generation, 70 µJ after polarization filtering, and 20 µJ at the RF gun entrance. These developments constitute a critical step toward multi-bunch, multi-beamline operation at PAL-XFEL, enhancing facility efficiency and enabling simultaneous user experiments.
| Paper status | No proceeding expected for this contribution. |
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