Speaker
Description
SLAC’s LCLS-II is pioneering high-repetition-rate attosecond X-ray science, enabling new opportunities to optimize X-ray generation by controlling the electron beam at its source—the photoinjector. LCLS-II employs a 20 ps Gaussian UV laser pulse to drive the photocathode, with an added narrow modulation to induce microbunching for extended modes. Recent advances in laser pulse shaping and frequency upconversion now allow for more sophisticated tailoring of the electron beam at the injector.
We present a novel approach using spectral amplitude and phase shaping of the IR laser, followed by dispersion-controlled nonlinear synthesis—relying on phase-modulated noncollinear sum-frequency generation—for UV upconversion. This enables diverse UV temporal profiles, including flattop and double/triple spikes, offering new degrees of freedom for shaping. Preliminary results from LCLS-II beam time show these modulations produce effective downstream perturbations to the electron bunch at the undulators, demonstrating feasibility for programmable bunch formation.
We are integrating this shaping into a start-to-end simulation framework,** enabling digital twin modeling of the XFEL chain—from photoinjector laser to X-ray output—laying the groundwork for fully tunable, end-to-end optimized, application-specific X-ray pulses.
Funding Agency
Supported by US DOE Contract No.’s DE-AC02-76SF00515, DE-SC0022559, DE-SC0022464, DE-FOA-0002859; NSF Contract No. 2231334, 2436343; and US DOD Contract No. FA9550-23-1-0409.
Footnotes
- Zhang, et al. HPLSE 12 (2024), DOI 10.1017/hpl.2024.33.
** Lemons, et al. PRAB 25.1 (2022), DOI 10.1103/PhysRevAccelBeams.25.013401
*** Hirschman, et al. Opt. Express 32.9 (2024), DOI 10.1364/OE.520542.
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