Session 1 - THz and IR sources: special operation modes, pump-probe, high-field
* Optical klystron for IR/THz radiation, Najmeh Mirian (HZDR)
* Simultaneous operation of two FELs, finally enabling 2-color experiments with tunable wavelength in the THZ/IR, Wieland Schöllkopf (FHIB)
* Enabling continuous THz band coverage via precise electron beam tailoring in free-electron lasers, Yin Kang (Shanghai Advanced Research Institute)
* TeraFERMI: A versatile beamline for ultrafast nonlinear terahertz spectroscopy, Paola DI Pietro (Elettra)*
Session 2 - SASE FELs: attosecond pulses and special operation modes
* Attosecond pulses with cathode laser shaping at SwissFEL, Zhaoheng Guo (EPFL & PSI)
* Towards attosecond SASE: generating photon pulse durations below the cooperation length limit, Evgeny Schneidmiller (DESY)
* Experimental demonstration of high-brightness, mode-coupled, and mode-locked SASE in an X-ray FEL, Wenxiang Hu (PSI)
Session 3 - THz sources: coherent, superradiant
* Enabling high-field terahertz science at European XFEL, Ilie Radu (EuXFEL)
* Theoretical studies of superradiant pulse saturation and sub-wavelength effects in FELs, Brian McNeil (University of Strathclyde)
Session 4 - Externally seeded FELs
* New developments in external seeding, Eugenio Ferrari (DESY)
* On the optimum wavelength range for soft X-ray FEL seeding at FERMI, Peter Susnjar (Elettra)
* Optical klystron HGHG configuration at FERMI, Giuseppe Penco (Elettra)
* Recent progress on the COXINEL seeded FEL based on laser-plasma acceleration, M. Labat (Synchrotron SOLEIL)
Session 5 - Electron beam and FEL pulse diagnostics (including machine learning)
* 5D Phase space reconstruction at DESY and PSI, Philipp Dijkstal (PSI)
* Machine-learning-enhanced automatic spectral characterization of x-ray pulses from a free-electron laser, Danilo Enoque Ferreira de Lima (EuXFEL)
* Double blind holography to reconstruct FEL SASE pulses, Oliviero Cannelli (CFEL & DESY)
* Single-shot electro-optic detection at MHz repetition of THz FEL pulses (enveloppe and carrier) at FELBE using diversity scheme and advanced reconstruction algorithms and Applications to electron bunches measurements at EuxFEL and FLASH, Q. Demazeux (CNRS & PhLAM, in collaboration with FELBE & DESY)
Session 6 - Externally seeded FELs: structured light in XUV and THz
* Coherent high-power terahertz vortex generation with tunable orbital angular momentum, Yin Kang (SINAP)
* Transient polarization gratings at FERMI, Laura Foglia (Elettra)
Session 7 - Microbunching instability and bunch compression
* Benchmarking of effective semi-analytical modelling of microbuching instability in high brightness linacs, Giovanni Perosa (EuXFEL & Elettra)
Session 8 - Undulator design and operation
* The new APPLE-III undulators for FLASH, Juliane Roensch-Schulenburg (DESY)
* Apple-X undulators at the European XFEL: commissioning and operation using reverse tapering at SASE3, Suren Karabekyan (EuXFEL)
* From concept to commissioning: SABINA — A 3–30 THz/IR FEL user facility at SPARC-LAB, Ilaria Balossino (INFN LNF)
