Speaker
Dr
Vladimir Ganenko
(National Scientific Center "Kharkov Institute of Physics&Technology", Kharkov, Ukraine)
Description
In this report it is presented results of data processing and analysis on studying radiation spectra of electrons with energy ~200 MeV in a diamond and silicon crystals at orientations when the electrons move near the crystal axes and planes. Preliminary results were presented in [1].
At energies of some hundred MeV the coherent effects in radiation resulted from an electron dynamic in the crystal were not practically investigated until now. At these energies the electrons motion in the crystal can be both regular, when axial and planar channeling is possible, and chaotic, when the coherent electron interaction with single strings reveals itself. The experimental results demonstrate strong increasing of the radiation intensity in energy region less 20 MeV. The maximal enhancement at axial orientation for diamond crystal 0.1 mm thick reaches at photon energy ~2-3 MeV about ten times more than the electron radiation in the amorphous matter of the same thickness.
At increasing the angle between crystal axis and electron beam the intensity at the low energy maximum decrease and peaks from coherent bremsstrachlung are appeared.
The experimental spectra are compared with theoretical calculation based on semi-classical model developed by the Kharkov’s group [2]. The experimental data show that the coherent electron interaction with single crystal strings gives the main contribution to the electron radiation.
References
1. K. Fissum, J. Brudvik, D. Burdeinyi, V. Ganenko, K. Hansen, L. Isaksson, K. Livingston, M. Lundin, V. Morokhovskyi, B. Nilsson, B. Schröder, G. Vashchenko, Radiation Spectra of Two Hundred MeV Electrons in Diamond and Silicon Crystals at Axial and Planar Orientations. "Charged and Neutral Particles Channeling Phenomena - Channeling 2008", Proceedings of the 51st Workshop of the INFN Eloisatron Project, S.B. Dabagov and L. Palumbo, Eds., World Scientific, 2010 (The Science and Culture series - Physics, Series Ed. A. Zichichi), p. 331.
2. N.F. Shul’ga, V.I. Truten’, A.A. Greenenko, Nual.Instr.Meth. B145 (1988)
Primary author
Dr
Vladimir Ganenko
(National Scientific Center "Kharkov Institute of Physics&Technology", Kharkov, Ukraine)
Co-authors
Bent Schröder
(Department of Physics, Lund University, SE-221 00 Lund, Sweden)
Bjorn Nilsson
(MAX-lab, Lund University, SE-221 00 Lund, Sweden)
Dmytro Burdeinyi
(National Scientific Center “Kharkov Institute of Physics & Technology”, 61108 Kharkov, Ukraine)
Jason Brudvik
(MAX-lab, Lund University, SE-221 00 Lund, Sweden)
Ken Livingston
(Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, Scotland, UK)
Kevin Fissum
(Department of Physics, Lund University, SE-221 00 Lund, Sweden)
Kurt Hansen
(MAX-lab, Lund University, SE-221 00 Lund, Sweden)
Lennart Isaksson
(Department of Physics, Lund University, SE-221 00 Lund, Sweden)
Magnus Lundin
(MAX-lab, Lund University, SE-221 00 Lund, Sweden)
Nicolai Shul’ga
(National Scientific Center “Kharkov Institute of Physics & Technology”, 61108 Kharkov, Ukraine)
Valentin Truten’
(National Scientific Center “Kharkov Institute of Physics & Technology”, 61108 Kharkov, Ukraine)
