Coordination changes in liquid tin under shock compression determined using in situ femtosecond x-ray diffraction by Briggs, R, Gorman, MG, Zhang, S, McGonegle, D, Coleman, AL, Coppari, F, Morales-Silva, MA, Smith, RF, Wicks, JK, Bolme, CA, Gleason, AE, Cunningham, E, Lee, HJ, Nagler, B, McMahon, MI, Eggert, JH, Fratanduono, DE

“…High-quality, femtosecond x-ray diffraction measurements at the Linac Coherent Light Source were used to extract the liquid diffuse scattering signal. …”

De novo determination of mosquitocidal Cry11Aa and Cry11Ba structures from naturally-occurring nanocrystals by Guillaume Tetreau, Michael R. Sawaya, Elke De Zitter, Elena A. Andreeva, Anne-Sophie Banneville, Natalie A. Schibrowsky, Nicolas Coquelle, Aaron S. Brewster, Marie Luise Grünbein, Gabriela Nass Kovacs, Mark S. Hunter, Marco Kloos, Raymond G. Sierra, Giorgio Schiro, Pei Qiao, Myriam Stricker, Dennis Bideshi, Iris D. Young, Ninon Zala, Sylvain Engilberge, Alexander Gorel, Luca Signor, Jean-Marie Teulon, Mario Hilpert, Lutz Foucar, Johan Bielecki, Richard Bean, Raphael de Wijn, Tokushi Sato, Henry Kirkwood, Romain Letrun, Alexander Batyuk, Irina Snigireva, Daphna Fenel, Robin Schubert, Ethan J. Canfield, Mario M. Alba, Frédéric Laporte, Laurence Després, Maria Bacia, Amandine Roux, Christian Chapelle, François Riobé, Olivier Maury, Wai Li Ling, Sébastien Boutet, Adrian Mancuso, Irina Gutsche, Eric Girard, Thomas R. M. Barends, Jean-Luc Pellequer, Hyun-Woo Park, Arthur D. Laganowsky, Jose Rodriguez, Manfred Burghammer, Robert L. Shoeman, R. Bruce Doak, Martin Weik, Nicholas K. Sauter, Brian Federici, Duilio Cascio, Ilme Schlichting, Jacques-Philippe Colletier

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Characterization of temporal coherence of hard X-ray free-electron laser pulses with single-shot interferograms by Taito Osaka, Takashi Hirano, Yuki Morioka, Yasuhisa Sano, Yuichi Inubushi, Tadashi Togashi, Ichiro Inoue, Kensuke Tono, Aymeric Robert, Kazuto Yamauchi, Jerome B. Hastings, Makina Yabashi

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3D multiphysics modeling of superconducting cavities with a massively parallel simulation suite by Oleksiy Kononenko, Chris Adolphsen, Zenghai Li, Cho-Kuen Ng, Claudio Rivetta

“…The simulation results and their implications for the operational stability of the Linac Coherent Light Source-II are discussed.…”
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Transverse to longitudinal phase space coupling in an electron beam for suppression of microbunching instability by Dazhang Huang, Chao Feng, Haixiao Deng, Qiang Gu, Zhentang Zhao

“…A common way to suppress the microbunching instability is to introduce extra uncorrelated energy spread by the laser heater that heats the beam through the interaction between the electron and laser beam, as what has been successfully implemented in the Linac Coherent Light Source and Fermi@Elettra. In this paper, a simple and effective scheme is proposed to suppress the microbunching instability by adding two transverse gradient undulators (TGU) before and after the magnetic bunch compressor. …”
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Characterization and mitigation of coherent-optical-transition-radiation signals from a compressed electron beam by A. H. Lumpkin, N. S. Sereno, W. J. Berg, M. Borland, Y. Li, S. J. Pasky

“…Noticeable enhancements of the optical transition radiation (OTR) signal sampled after the APS chicane were then observed as has been reported in the Linac Coherent Light Source (LCLS) injector commissioning. A far-infrared (FIR) coherent transition radiation detector and interferometer were used to monitor the bunch compression process and correlate the appearance of localized spikes of OTR signal (5 to 10 times brighter than adjacent areas) within the beam-image footprint. …”
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Fast modeling of regenerative amplifier free-electron lasers by River R. Robles, Aliaksei Halavanau, Gabriel Marcus, Zhirong Huang

“…We especially focus on fast modeling of the FEL process and x-ray optics, while capturing effects pertaining to actual experimental setups at the Linac Coherent Light Source (LCLS) at SLAC. Such a method can be used to explore RAFEL at other wavelengths by suitable replacement of the optics modeling.…”
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Lightwave-driven electron emission for polarity-sensitive terahertz beam profiling by Simon Jappe Lange, Matthias C. Hoffmann, Peter Uhd Jepsen

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Two-bunch self-seeding for narrow-bandwidth hard x-ray free-electron lasers by Yuantao Ding, Zhirong Huang, Ronald D. Ruth

“…We present start-to-end simulation results based on the linac coherent light source hard x-ray FEL and show that this method can produce a nearly fully coherent x-ray pulse at a few GW power level.…”
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Microbunch rotation in an x-ray free-electron laser using a first-order achromatic bend by Rachel A. Margraf, James P. MacArthur, Gabriel Marcus, Heinz-Dieter Nuhn, Alberto Lutman, Aliaksei Halavanau, Zhen Zhang, Zhirong Huang

“…In this work, we demonstrate hard x-ray multiplexing in the Linac Coherent Light Source hard x-ray undulator line using microbunch rotation through a 10  μrad first-order-achromatic bend created by transversely offsetting quadrupole magnets in the FODO lattice. …”
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Purified self-amplified spontaneous emission free-electron lasers with slippage-boosted filtering by Dao Xiang, Yuantao Ding, Zhirong Huang, Haixiao Deng

“…The purified radiation, as a seed with improved temporal coherence, is further amplified to saturation in the undulator sections tuned to the FEL wavelength. Using the linac coherent light source II (LCLS-II) parameters as an example, we show that with the proposed configuration the temporal coherence and spectral brightness of a SASE FEL can be significantly enhanced. …”
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Early Days of SACLA XFEL by Tetsuya Ishikawa

“…Although progress was initially slow, the small-scale, low-cost SACLA was smoothly constructed, and it became the second light source to lase in the 0.1 nm wavelength region, following the LCLS (linac coherent light source) in the United States. In this paper, we look back on the history leading up to SACLA. and describe the SCSS (SPring-8 compact SASE source) project as a preparatory stage and a part of the construction/commissioning of SACLA. …”
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Submacropulse electron-beam dynamics correlated with higher-order modes in a Tesla-type cryomodule by A. H. Lumpkin, R. Thurman-Keup, D. Edstrom, P. Prieto, J. Ruan, B. Jacobson, J. Sikora, J. Diaz-Cruz, A. Edelen, F. Zhou

“…These experimental results were evaluated for machine learning training aspects which will be used to inform the commissioning plan for the Linac Coherent Light Source-II injector CM. With an entrance beam energy of <1  MeV in this case (or for ∼6  MeV at the European X-ray Free-electron Laser injector), the HOM-effect mitigation would be particularly critical.…”
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Mode-locked multichromatic x rays in a seeded free-electron laser for single-shot x-ray spectroscopy by Dao Xiang, Yuantao Ding, Tor Raubenheimer, Juhao Wu

“…The feasibility of generating mode-locked x rays ranging from carbon K edge (∼284  eV) to copper L_{3} edge (∼931  eV) is confirmed with numerical simulation using the realistic parameters of the linac coherent light source (LCLS) and LCLS-II. We anticipate that the mode-locked multichromatic x rays in FELs may open up new opportunities in x-ray spectroscopy (i.e. resonant inelastic x-ray scattering, time-resolved scattering and spectroscopy, etc.).…”
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Spectroscopic studies of hard x-ray free-electron laser-heated foils at 10 16 Wcm -2 irradiances by Dunn, J, Shepherd, R, Graf, A, Steel, A, Park, J, Moon, S, Lee, R, Audebert, P, Levy, A, Gauthier, M, Fuchs, J, Fritz, D, Cammarata, M, Milathianaki, D, Lee, H, Nagler, B, Fourment, C, Deneuville, F, Williams, G, Fajardo, M, Gaudin, J, Vinko, S, Ciricosta, O, Wark, J, Chung, H

“…We report a recent experiment where the first hard x-ray beam line, X-ray Pump Probe (XPP) instrument using the SLAC National Accelerator Laboratory's Linac Coherent Light Source (LCLS) free electron laser, was used to heat thin foils to high energy densities ∼ 107 J/cm 3. …”

Clocking femtosecond collisional dynamics via resonant X-ray spectroscopy by van den Berg, Q, Fernandez-Tello, E, Burian, T, Chalupský, J, Chung, H, Ciricosta, O, Dakovski, G, Hájková, V, Hollebon, P, Juha, L, Krzywinski, J, Lee, R, Minitti, M, Preston, T, de la Varga, A, Vozda, V, Zastrau, U, Wark, J, Velarde, P, Vinko, S

“…Here we describe the first experimental measurements of ultra-fast electron impact collisional ionization dynamics using resonant core-hole spectroscopy in a solid-density magnesium plasma, created and diagnosed with the Linac Coherent Light Source x-ray FEL. By resonantly pumping the 1s ! …”

Simultaneous 8.2 keV phase-contrast imaging and 24.6 keV X-ray diffraction from shock-compressed matter at the LCLS by Seiboth, F, Fletcher, L, McGonegle, D, Anzellini, S, Dresselhaus-Cooper, L, Frost, M, Galtier, E, Goede, S, Harmand, M, Lee, H, Levitan, A, Miyanishi, K, Nagler, B, Nam, I, Ozaki, N, Rodel, M, Schropp, A, Spindloe, C, Sun, P, Wark, J, Hastings, J, Glenzer, S, McBride, E

“… In this work, we demonstrate simultaneous phase-contrast imaging (PCI) and X-ray diffraction from shock compressed matter at the Matter in Extreme Conditions (MEC) endstation, Linac Coherent Light Source (LCLS). We utilize the chromaticity from compound refractive X-ray lenses to focus the 24.6 keV 3rd order undulator harmonic of the LCLS to a spot size of 5 μm on target to perform X-ray diffraction. …”

Going around the Kok cycle of the water oxidation reaction with femtosecond X-ray crystallography by Asmit Bhowmick, Philipp S. Simon, Isabel Bogacz, Rana Hussein, Miao Zhang, Hiroki Makita, Mohamed Ibrahim, Ruchira Chatterjee, Margaret D. Doyle, Mun Hon Cheah, Petko Chernev, Franklin D. Fuller, Thomas Fransson, Roberto Alonso-Mori, Aaron S. Brewster, Nicolas K. Sauter, Uwe Bergmann, Holger Dobbek, Athina Zouni, Johannes Messinger, Jan Kern, Vittal K. Yachandra, Junko Yano

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Case Study of High-Throughput Drug Screening and Remote Data Collection for SARS-CoV-2 Main Protease by Using Serial Femtosecond X-ray Crystallography by Omur Guven, Mehmet Gul, Esra Ayan, J Austin Johnson, Baris Cakilkaya, Gozde Usta, Fatma Betul Ertem, Nurettin Tokay, Busra Yuksel, Oktay Gocenler, Cengizhan Buyukdag, Sabine Botha, Gihan Ketawala, Zhen Su, Brandon Hayes, Frederic Poitevin, Alexander Batyuk, Chun Hong Yoon, Christopher Kupitz, Serdar Durdagi, Raymond G. Sierra, Hasan DeMirci

“…Here we demonstrated the possibility of screening a variety of drugs efficiently by leveraging a high data collection rate of 120 images/second with the new low-noise, high dynamic range ePix10k2M Pixel Array Detector installed at the Macromolecular Femtosecond Crystallography (MFX) instrument at the Linac Coherent Light Source (LCLS). The X-ray Free-Electron Laser (XFEL) is used for remote high-throughput data collection for drug repurposing of the main protease (Mpro) of SARS-CoV-2 at ambient temperature with mitigated X-ray radiation damage. …”
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Carrier-specific dynamics in 2H-MoTe2 observed by femtosecond soft x-ray absorption spectroscopy using an x-ray free-electron laser by Alexander Britz, Andrew R. Attar, Xiang Zhang, Hung-Tzu Chang, Clara Nyby, Aravind Krishnamoorthy, Sang Han Park, Soonnam Kwon, Minseok Kim, Dennis Nordlund, Sami Sainio, Tony F. Heinz, Stephen R. Leone, Aaron M. Lindenberg, Aiichiro Nakano, Pulickel Ajayan, Priya Vashishta, David Fritz, Ming-Fu Lin, Uwe Bergmann

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