Advances in Synchrotron and Undulator Radiation Studies Ⅱ

Dear Colleagues,

Radiation from accelerated charges and the underlying physical symmetries have been attracting researchers’ attention for more than 70 years. The synchrotron radiation (SR) was discovered in 1947, following its prediction in 1944. Its beam has strongly asymmetric spatial distribution along the direction of the charge motion and it is highly polarized in the plane of the orbit. The undulator radiation (UR) is based on the physical principles of the SR. Interacting with the electrons, the UR groups them in micro-bunchesseparated by the radiation wavelength, resulting in intense short bursts of coherent UR. This idea, expressed by Ginzburg, gave rise to the development of the theory of the free electron laser (FEL), invented by John Madey in 1971. The SR, UR and FELs have been intensively studied and exploited by researchers. The applications appear in many branches of science, such as medicine, archeology, chemistry, biology and others. Modern FELs extend to X-ray band, where SR has been the strongest source of radiation for a long time. X-ray free electron lasers allow nano-scale studies of structures and inner symmetries of molecules, materials, etc. The respective installations, such as the European X-FEL, are huge. The challenges include the reduction of the FEL sizes, the improvement of the temporal coherence and symmetry of the radiation pulses, etc. Theoretical studies were followed by experiments with seeding and high harmonic generation, etc.

Researchers are welcomed to contribute to this Special Issue with their studies on the theories of SR, UR and FEL, with new relevant results in the accelerator techniques, undulator technologies andFEL realization. Experimental achievements at the working installations, applications, and proposals for future research facilities are also welcomed.

Prof. Dr. Konstantin Zhukovsky
Guest Editor

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