title: Temporally-coherent terawatt attosecond XFEL synchronized with a few cycle laser.
abstract: Attosecond metrology using laser-based high-order harmonics has been significantly advanced and applied to various studies of electron dynamics in atoms, molecules and solids. Laser-based high-order harmonics have a limitation of low power and photon energies. There is, however, a great demand for even higher power and photon energy. Here, we propose a scheme for a terawatt attosecond (TW-as) X-ray pulse in X-ray free-electron laser controlled by a few cycle IR pulse, where one dominant current spike in an electron bunch is used repeatedly to amplify a seeded radiation to a terawatt level. This scheme is relatively simple, compact, straightforward, and also produces a temporally and spectrally clean pulse. The viability of this scheme is demonstrated in simulations using Pohang accelerator laboratory (PAL)-XFEL beam parameters.
authors.affiliation: Department of Physics, Center for Attosecond Science and Technology, Pohang University of Science and Technology, Pohang, 37673, South Korea.|Max Planck Center for Attosecond Science, MPK, POSTECH, Pohang, 37673, South Korea.
authors.forename: Sandeep
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Pohang Accelerator Laboratory, Pohang, 37673, South Korea.
authors.forename: Yong Woon
authors.initials: YW
authors.lastname: Parc
authors.affiliation: Department of Physics, Center for Attosecond Science and Technology, Pohang University of Science and Technology, Pohang, 37673, South Korea.|Max Planck Center for Attosecond Science, MPK, POSTECH, Pohang, 37673, South Korea.|Max Planck Institute for the Physics of Complex Systems, Noethnitzer Str. 38, 01187 Dresden, Germany.
authors.forename: Alexandra S
authors.initials: AS
authors.lastname: Landsman
authors.affiliation: Department of Physics, Center for Attosecond Science and Technology, Pohang University of Science and Technology, Pohang, 37673, South Korea.|Max Planck Center for Attosecond Science, MPK, POSTECH, Pohang, 37673, South Korea.
authors.forename: Dong Eon
authors.initials: DE
authors.lastname: Kim