FEL2026 - 42nd International Free Electron Laser Conference

Session

Seeded FEL (Contributed)

TUB

25 Aug 2026, 11:20

122. Coherent Undulator Radiation Seeding of High-Gain Harmonic Generation (TUB01)

Jenny Morgan (SLAC National Accelerator Laboratory)

25/08/2026, 11:20

Session 5: Seeded FEL

Contributed Oral Presentation

We propose and simulate a scheme for generating coherent short-wavelength radiation exploiting the intrinsic coherence of emission from a compressed, high-current electron beam. When the bunch length is shorter than the resonant wavelength, the undulator radiation is temporally coherent. This radiation is extracted and optically refocused onto a second, longer electron beam, acting as a...

148. HXRSS at the European XFEL: Progress from SASE2 to SASE1 (TUB02)

Matthias Scholz (Deutsches Elektronen-Synchrotron DESY)

25/08/2026, 11:36

Session 5: Seeded FEL

Contributed Oral Presentation

The first high-repetition-rate hard X-ray self-seeding system was installed on the SASE2 beamline of the European XFEL in 2019. It has since been used to deliver self-seeded radiation pulses in burst mode over the photon-energy range from 6 to 18 keV, reaching a maximum spectral density of approximately 2 mJ/eV at 7.5 keV. User operation started in 2021, and an increasing fraction of user time...

146. Recent development of Hard X-Ray Self-Seeding design and experiment tests for LCLS-II-HE high repetition rate operation (TUB03)

Ye Hong (SLAC National Accelerator Laboratory)

25/08/2026, 11:52

Session 5: Seeded FEL

Contributed Oral Presentation

To overcome the thermal load challenges at the high-rep rate HXR self-seeding FELs, we summarize the recent design and experimental test progress. The LCLS-II-HE is designed to have cryo-cooled HXRSS system. To validate the design and prototype, experiment tests have been carried out on the diamond and the related mounting and clamping schemes. Wavefront sensors and single-shot spectrometers...