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Alexander Reid (SLAC)8/27/25, 8:30 AM
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Pietro Musumeci (UCLA)8/27/25, 8:40 AM
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Joel England (SLAC)8/27/25, 9:10 AM
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Alke Meents8/27/25, 10:00 AM
For UED experiments DESY operates the ‘relativistic gun for atomic exploration (REGAE)’. REGAE generates electron pulses with an energy of 2 - 5 MeV and a charge of up to 100 fC. An additional buncher cavity allows compress these pulses to 20 fs. For diffraction experiments with solid state samples, REGAE is equipped with a crystallography goniometer and a Jungfrau 1M detector, which allowed...
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Julian McKenzie8/27/25, 10:30 AM
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Dao Xiang (SJTU)8/27/25, 11:00 AM
Abstract: The National Science Foundation of China supported the construction of a MeV UED/UEM facility at Shanghai Jiao Tong University from 2014 to 2019. The facility achieved a high temporal resolution of <50 fs (FWHM) and supported about 20 experiments since 2020. I will discuss the critical technologies that enabled the high temporal resolution.
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Jun Heo (KAERI)8/27/25, 11:30 AM
The MeV-UED facility at the Korea Atomic Energy Research Institute (KAERI) has been
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constructed to investigate ultrafast structural dynamics with a focus on experimental flexibility.
This talk will provide an overview of the beamline configuration and timing system, followed
by a detailed look at the experimental setup, including gas sample delivery system, interaction
chambers, and... -
Joel England (SLAC)8/27/25, 12:00 PM
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Dr Yusong Liu (SLAC, LCLS)8/27/25, 2:00 PM
Provide an introduction to the invited speakers and an overview of the scientific presentations in the session.
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Dr Pedro Nunes (Diamond Light Source, Ltd)8/27/25, 2:05 PM
Gas-phase ultrafast electron diffraction (UED) has become a powerful tool for capturing molecular dynamics with femtosecond temporal and atomic spatial resolutions, enabling direct observation of phenomena such as photo-dissociation, ring-opening reactions, and nuclear wavepacket motion through conical intersections. Despite significant progress, several challenges remain: temporal resolution...
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Prof. Daniel Rolles (Kansas State University)8/27/25, 2:35 PM
The five-member ring isomers oxazole and isoxazole (C3H3NO) are an interesting model system for studying UV-induced isomerization and dissociation since the different types of bonds in both isomers (C-N-C-O vs C-N-O-C) are predicted to lead to very different reaction products and dynamics. I will present time-resolved product yields for both isomers obtained from a recent GUED experiment and...
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Dr Oliver Gessner (LBNL)8/27/25, 3:05 PM
Bromoform (CHBr3) is a natural compound whose UV photodissociation products contribute to ozone depletion in the Earth’s atmosphere. Ultrafast electron diffraction is used to study atomic rearrangements in isolated and in solvated bromoform molecules after 267 nm excitation. The gas phase study provides the first experimental visualization of a long-predicted ultrafast isomerization channel....
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Dr Elisa Biasin8/27/25, 3:40 PM
Femtosecond X-ray solution scattering (XSS) has enabled us to capture photoinduced structural dynamics in solvated transition metal complexes with atomic-scale resolution, revealing intramolecular changes, vibrational coherences, and solvation dynamics. In this talk, I will present recent XSS results from the LCLS, with a particular emphasis on tracking photoinduced solute–solvent...
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Prof. Jie Yang (TsingHua University)8/27/25, 4:10 PM
Laser-induced streaking (LIS) of electron beam, first observed by Zewail group back in 1994, is a unique phenomenon in UED that is often used to conveniently identify time-zero in UED experiments. In the gas phase, LIS originates from plasma field created by strong field ionization of sample molecules, hence named as “photoionization-induced lensing” by Zewail. Separately, LIS can also be...
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Alfred Zong (Stanford)8/28/25, 9:00 AM
An excitonic insulator is a material that hosts an exotic ground state, where an energy gap opens due to spontaneous condensation of bound electron-hole pairs. Ta2NiSe5 is a promising candidate for this type of material, but the coexistence of a structural phase transition with the gap opening has led to a long-standing debate regarding the origin of the insulating gap. In this talk, I will...
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Mariano Trigo (SLAC)8/28/25, 9:30 AM
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Archana Raja (LBNL)8/28/25, 10:00 AM
Van der Waals crystals enable the construction of arbitrary, atomically precise heterostructures through straightforward layering of different monolayers without requiring covalent bonds or epitaxial matching. Understanding charge and energy transfer mechanisms in these atomically thin, two-dimensional (2D) material interfaces is fundamental to their electronic and electrochemical...
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Renkai Li (Tsinghua University)8/28/25, 11:00 AM
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Tianhuan Luo (Lawrence Berkeley National Laboratory)8/28/25, 11:30 AM
High rep-rate SRF-Linac based XFEL like LCLS-II has a stringent requirement on the limit of the dark current from the injector RF gun. In this talk, we will present our recent work on mitigating the LCLS-II gun dark current by re-designing the photo cathode. New cathode plugs with ~1mm insertion have been designed, manufactured and commissioned at LCLS-II. They successfully reduce the gun...
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Haoran Xu (Los Alamos National Laboratory)8/28/25, 12:00 PM
Two high-gradient 1.6-cell normal-conducting RF photoinjectors at C-band were designed for operation at the Cathodes And Radiofrequency Interaction in Extremes (CARIE) facility at Los Alamos National Laboratory (LANL). The first photoinjector cavity uses a planar copper cathode and has been fabricated and tuned at low power. The second photoinjector cavity was designed for using INFN-style...
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Ben Hounsell (STFC UKRI)8/28/25, 12:30 PM
RUEDI (Relativistic Ultrafast Diffraction and Imaging) is a planned UK national user facility. It has a diffraction beamline optimised for temporal resolution. This beamline uses an S-band normal conducting RF gun followed by a triple bend achromat magnetic compressor which simultaneously compresses the bunch and suppresses the time of arrival jitter to the 10 fs scale. The compressor has...
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Sergio Carbajo (UCLA)8/28/25, 2:30 PM
LCLS-II is advancing attosecond X-ray science by optimizing electron beam generation at the photoinjector through tailored UV laser pulses. We introduce a novel method combining IR spectral shaping and dispersion-controlled nonlinear upconversion to produce customizable UV profiles (e.g., flattop, multi-spike). Preliminary LCLS-II experiments confirm these modulations effectively perturb...
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Steven Zeltmann (Cornell)8/28/25, 3:00 PM
Four-dimensional scanning transmission electron microscopy, where the full forward scattering distribution of the electron beam is recorded by a 2D pixelated detector at each position in a scan, provides a wealth (a deluge?) of information about the sample. Detectors with high dynamic range enable quantitative analysis of the diffraction data, and their high speed (10-100k fps) allows us to...
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Mohamed Othman (SLAC)8/28/25, 3:30 PM
Recent advances in THz acceleration have shown promise for manipulation of mega-electron volt scale electron bunches with high efficiency and small footprint. Over the years we have established various new techniques for THz-driven pulse compression and timing diagnostics utilizing single and dual-fed THz compressor structures to enable much shorter electron pulses and simultaneously improve...
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Michael Kaemingk (Los Alamos National Laboratory)8/28/25, 4:00 PM
Laser technologies for generating sub-picosecond pulses at different wavelengths have propelled photocathodes to the forefront of electron sources. By leveraging nanofabrication techniques, photocathode research now promises to deliver sources for beams with sub-micron transverse dimensions and sub-nanometer emittances. The techniques for fabricating these sources are versatile, allowing them...
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Prof. Benjamin Ofori-Okai (SLAC)8/29/25, 8:30 AM
When driven to extreme temperatures, solid density matter can exhibit properties different than those found at ambient conditions. Measurement of properties, in particular transport properties such as the electrical conductivity, has been possible by heating thin films of material using ultrafast lasers. However, interpretation of experimental results and comparison with theoretical prediction...
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Prof. Artur Tamm (University of Tartu)8/29/25, 9:00 AM
Experimental study of early damage in nuclear damage has been very challenging due to low quantity and small size of defects. Therefore, being able to reliably validate modelling techniques of primary damage in nuclear materials has not been possible. Recent, advances in UED experiments has made it possible to study the dynamics of the material due to laser excitation. By comparing the signals...
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Dr Mianzhen Mo (SLAC)8/29/25, 9:30 AM
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Prof. Aditya Sood (Princeton University)8/29/25, 10:30 AM
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Prof. Scott Cushing (Caltech)8/29/25, 11:00 AM
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Dr Sharon Philip (SLAC)8/29/25, 11:30 AM
11:30- 12:00
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Prof. Mohammed Hassan (University of Arizona)
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Prof. Russell Minns (University of Southampton)
To be determined
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