Hwang, Ji-G.; Abo-Bakr, M.; Atkinson, T.; Goslawski, P.; Jankowiak, A.; Klemz, G.; Müller, R.; Ries, M.; Schlälicke, A.; Schiwietz, G.: Generation of intense and coherent sub-femtosecond X-ray pulses in electron storage rings. Scientific Reports 10 (2020), p. 10093/1-7
Open Accesn Version

Temporally short X-ray pulses are an indispensable tool for the study of electron transitions close to the fermi energy and structural changes in molecules undergoing chemical reactions which take place on a time-scale of hundreds of femtoseconds. The time resolution of experiments at 3rd generation light sources which produce intense synchrotron radiation is limited fundamentally by the electron-bunch length in the range of tens of picoseconds. Here we propose a new scheme for the generation of intense and coherent sub-femtoseconds soft X-ray pulses in storage rings by applying the echo-enabled Harmonic Generation (eeHG) method. Many issues for obtaining the eeHG structure such as two modulators and a radiator are solved by a paradigm shift in an achromatic storage ring cell. numerical demonstration of the feasibility of the scheme for the BeSSY ii beam parameters is presented.