X-Ray Lasers 2016 by Tetsuya Kawachi Sergei V. Bulanov Hiroyuki Daido & Yoshiaki Kato

Author:Tetsuya Kawachi, Sergei V. Bulanov, Hiroyuki Daido & Yoshiaki Kato
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

These results suggest the possibility of realization of tandem inversionless FEL with multiple radiative transitions between same two levels (upper and lower) with an emission of a great number of X-ray photons in two directions. The frequencies of photons in these directions may be same or different. The source of energy for these repetitive cycles of quanta radiation is the kinetic energy of the particle. At typical transition energy , the maximum frequency of radiation in such tandem system corresponds to points K and C (Fig. 28.1) and equals . Unfortunately, such value of is not realistic, because in such frequency range it is impossible to satisfy the condition . The easiest way for the realization of this condition may be achieved in the low-frequency range at dynamical Bragg diffraction of generated X-radiation in the same crystal, in this case . One more interesting problem is connected with radiation at channeling when the particle moves in periodically modulated channels. In this regime, there is a synchronization of its own wave functions of transverse motion and formation of coherent correlated states [3–6] that may substantially affect the emission processes.

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