Original manuscripts are sought to the special issue on X-ray Free Electron Lasers (XFELs) of High Power Laser Science and Engineering (HPL).

The scope of this special issue is to highlight the cutting-edge theoretical and experimental results related to XFELs worldwide. The topics invited for inclusion are, but not limited to:

• Advanced XFEL techniques (e.g. attosecond technology, high rep-rate, multi-pulse/color, longitudinal coherent pulse generation, polarization control, etc.)
• Synchronization and diagnostics (e. g. advanced synchronization schemes, delay and duration diagnostics, etc.)
• Compact XFELs (e. g. hybrid RF-ICS, LWFA, THz-based, XFELs)
• Automation and machine-learning in XFELs (e.g. background optimization, multiplexing, machine design and beam dynamics, etc.)
• Ultrafast laser systems and related technologies (e.g. ultrahigh peak power lasers, pump-probe lasers, OPCPA, THz, etc.)
• Front-end laser technology (e.g. novel photo-injectors, laser heaters and laser-based electron manipulation and conditioning, etc.)

Guest Editors:

Max Lederer, European-XFEL, Germany
Haixiao Deng, Shanghai Advanced Research Institute, CAS, China
Sergio Carbajo, LCLS, Stanford, USA
Co-ordinating Editor: Colin Danson, Editor-in-Chief, High Power Laser Science and Engineering

Submission deadline: 1 July 2021

Manuscripts should be submitted via the online submission system at: http://mc03.manuscriptcentral.com/clp-hpl. Please select “Special Issue on XFELs 2021” from the drop-down menu under “Special Issue” when submitting manuscript. HPL is an open access journal co-published by Chinese Laser Press and Cambridge University Press. It seeks to uncover the underlying science and engineering in the fields of high energy density physics, high power lasers, advanced laser technology and applications, and laser components. Articles in HPL are freely available to all readers worldwide via journals.cambridge.org/hpl & hpl.clp.ac.cn.