Speaker
Description
LCLS-II introduces MHz-rate operation and sub-femtosecond X-ray pulses, creating a need for high-rate control mechanisms at the photoinjector and diagnostic systems capable of extracting pulse structure on every shot. This work presents two key components toward meeting these requirements. First, a programmable photoinjector-laser system combining a spatial light modulator with dispersion-controlled nonlinear synthesis enables tunable UV temporal profiles compatible with the LCLS-II photocathode. Beamtime measurements demonstrate controllable modulation of the electron bunch and corresponding structure in the emitted X-ray pulses, including a triple-hump temporal pattern. Second, a high-throughput streaming front-end and machine-learning framework is developed for the Multi-Resolution Cookiebox diagnostic to rapidly extract attosecond X-ray pulse structure at high repetition rate. Together, these advances supply essential building blocks for future adaptive operation, including multiplexed experimental modes, live tuning of X-ray output, and integration with emerging modeling and optimization efforts.**
Footnotes
Lemons, et al. Ultrafast Science 4 (2025)
Hirschman, et al. APL Mach. Learn. 3 (2025)
**Hirschman, et al. Proceedings in IPAC 16 (2025)
Funding Agency
US DOE Contract No.’s DE-AC02-76SF00515, DE-SC0022559, DE-SC0022464, DE-FOA-0002859, FWP100498, FWP100643, FWP101046; NSF Contract No. 2231334, 2436343; and US DOD Contract No. FA9550-23-1-0409.
| In which format do you inted to submit your paper? | LaTeX |
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