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20242026
most citedUpstream Laser-based Longitudinal Enhancement of Relativistic Photoelectrons

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physics.acc-ph2026

Broadband hard X-ray attosecond pulses from extremely chirped electron beams

River Robles, Veronica Guo, David Cesar +10

Attosecond pulses from free-electron lasers have opened the doors to atomic site-specific studies of bound electronic dynamics on their natural, sub-femtosecond timescales. Key to…

physics.acc-ph2026

Advanced Control of Electron Beams: Tailoring X-ray Production with Programmable Laser Shaping

Jack Hirschman, Randy Lemons, Hao Zhang +23

Leveraging the full scientific capabilities of next-generation high-repetition-rate free-electron lasers requires programmable control over electron-beam properties at their source…

physics.acc-ph2025

Spectrotemporal shaping of attosecond x-ray pulses with a fresh-slice free-electron laser

River R. Robles, Kirk A. Larsen, David Cesar +14

We propose a scheme allowing coherent shaping, i.e., controlling both the amplitude and phase, of attosecond x-ray pulses at free-electron lasers. We show that by seeding an FEL wi…

physics.acc-ph2025

Experimental generation of extreme electron beams for advanced accelerator applications

Claudio Emma, Nathan Majernik, Kelly Swanson +13

In this Letter we report on the experimental generation of high energy (10 GeV), ultra-short (fs-duration), ultra-high current (0.1 MA), petawatt peak power electron beams in a par…

physics.acc-ph2024

Three-dimensional theory of superradiant free-electron lasers

River R. Robles, Luca Giannessi, Agostino Marinelli

The soliton-like superradiant regime of free-electron lasers (FEL) offers a promising path towards ultrashort pulses, beyond the natural limit dictated by the bandwidth of the high…

physics.acc-ph2024

"Beam `a la carte": laser heater shaping for attosecond pulses in a multiplexed x-ray free-electron laser

Siqi Li, Zhen Zhang, Shawn Alverson +19

Electron beam shaping allows the control of the temporal properties of x-ray free-electron laser pulses from femtosecond to attosecond timescales. Here we demonstrate the use of a…