Speaker
Tianyun Long
(Deutsches Elektronen-Synchrotron DESY)
Description
Hard X-ray Self-seeding (HXRSS) is a well-know scheme to obtain longitudinally coherent FEL pulses with single SASE mode selected by a crystal. However, multi-modes can also be produced if the electron beam contains lasing parts with different energy chirp slopes (i.e. nonlinear chirp). At the European XFEL we have observed HXRSS with multi-modes and investigated its origin both in simulation and in experiments. In this paper, we present simulations and experimental results and discuss possible ways to suppress this effect.
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Authors
Gianluca Geloni
(European X-Ray Free-Electron Laser)
Jiawei Yan
(European X-Ray Free-Electron Laser)
Marc Guetg
(Deutsches Elektronen-Synchrotron DESY)
Philipp Dijkstal
(Paul Scherrer Institute)
Shan Liu
(Deutsches Elektronen-Synchrotron DESY)
Tianyun Long
(Deutsches Elektronen-Synchrotron DESY)
Weilun Qin
(Deutsches Elektronen-Synchrotron DESY)
