11.06.2012 | Mette Alstrup Lie

Dato	fre 15 jun
Tid	10:15 — 11:00
Sted	1525-323

Prof. Dr. Andrey Solov’yov, Frankfurt Institute for Advanced Studies, Goethe Universität, Frankfurt am Main, Germany

Crystalline undulator based GAMMA-laser: current status and perspectives

The feasibility of gamma-rays generation by means of spontaneous emission from ultra-relativistic positrons due to their planar channeling through a periodically bent crystal (crystalline undulator) was demonstrated several years ago, see [1] and references therein. In these papers the possibility of stimulated emission within the hundreds of keV and MeV range (i.e. on the feasibility of crystalline undulator based gamma-laser) was also considered.
The crystalline undulator can be a source of coherent radiation if it is fed by a beam of ultrarelativistic charged particles whose density is spatially modulated along the beam direction [2]. The period of the modulation should be equal to the integer multiple of the  wavelength of the emitted radiation. In this case the particles radiate electromagnetic waves with essentially the same phase and, therefore, the intensity of the radiation becomes proportional to the beam density squared, in contrast to linear proportionality in the undulator case.
In the recent patent [3] we have described a device in which the crystalline undulator is placed near the exit from the magnetic undulator and therefore is fed by a modulated particle beam. This tandem of magnetic and crystalline undulators allows the intensive generation of coherent radiation in hard X-ray or gamma ray range. Thus we called the suggested device the Gamma-laser.
In the proposed talk these novel ideas will be presented and discussed in detail in the context of the earlier work of the group devoted to the theory of crystalline undulators and the development of the crystalline undulator based novel light sources [4,5]. The recent computer simulations of the channeling and radiation processes in linear and bent crystals will also be presented [6].

References
[1] A. V. Korol, A. V. Solov’yov, W. Greiner, Int.J.Mod.Phys. E13 (2004) 867-916.
[2] A. Kostyuk, A. V. Korol, A. V. Solov’yov and W. Greiner, J. Phys. B: At. Mol. Opt. Phys. (FAST TRACK COMMUNICATION, IOP SELECT) 43 (2010) 151001.
[3] W. Greiner, A. V. Korol, A. Kostyuk, A. V. Solov’yov, Vorrichtung und Verfahren zur Erzeugung electromagnetischer Strahlung, Patent Number 10 2010 023 632, December 20 (2011)
[4] A.V. Korol, A.V.Solov’yov, W. Greiner, Int.J.Mod.Phys. E13 (2004) 867-916.
[5] M. Tabrizi, A. V. Korol, A. V. Solov’yov and W. Greiner, Phys. Rev. Lett. 98 (2007) 164801.
[6] A. Kostyuk, A. V. Korol, A. V. Solov’yov and W. Greiner, J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 075208 [0pt]