Appl. Sci. 2017, 7(6), 614; doi:10.3390/app7060614
Terawatt-Isolated Attosecond X-ray Pulse Using a Tapered X-ray Free Electron Laser
1
Department of Physics, Center for Attosecond Science and Technology, Pohang University of Science and Technology, Pohang 790-784, Korea
2
Max Planck Center for Attosecond Science, Pohang 790-784, Korea
3
Max Planck Institute for the Physics of Complex Systems, Noethnitzer Street 38, 01187 Dresden, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Kiyoshi Ueda
Received: 30 March 2017 / Revised: 29 May 2017 / Accepted: 8 June 2017 / Published: 13 June 2017
(This article belongs to the Special Issue X-Ray Free-Electron Laser)
Abstract
High power attosecond (as) X-ray pulses are in great demand for ultrafast dynamics and high resolution microscopy. We numerically demonstrate the generation of a ~230 attosecond, 1.5 terawatt (TW) pulse at a photon energy of 1 keV, and a 115 attosecond, 1.2 TW pulse at a photon energy of 12.4 keV, using the realistic electron beam parameters such as those of Korean X-ray free electron laser (XFEL) in a tapered undulator configuration. To compensate the energy loss of the electron beam and maximize its radiation power, a tapering is introduced in the downstream section of the undulator. It is found that the tapering helps in not only amplifying a target radiation pulse but also suppressing the growth of satellite radiation pulses. Tapering allows one to achieve a terawatt-attosecond pulse only with a 60 m long undulator. Such an attosecond X-ray pulse is inherently synchronized to a driving optical laser pulse; hence, it is well suited for the pump-probe experiments for studying the electron dynamics in atoms, molecules, and solids on the attosecond time-scale. For the realization of these experiments, a high level of synchronization up to attosecond precision between optical laser and X-ray pulse is demanded, which can be possible by using an interferometric feedback loop. View Full-TextKeywords:
UV; EUV; and X-ray lasers; attosecond pulses; free-electron laser; undulator radiation
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Kumar, S.; Landsman, A.S.; Kim, D.E. Terawatt-Isolated Attosecond X-ray Pulse Using a Tapered X-ray Free Electron Laser. Appl. Sci. 2017, 7, 614.
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