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Proceedings Paper

Coherent bremsstrahlung in thick crystals radiation losses and photon multiplicity
Author(s): Alexander P. Potylitsyn; Igor S. Tropin
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Paper Abstract

The promising scheme to design the intense positron source is based on using of oriented crystal to generate an intense photon beam and amorphous converter for shower producing. Properties of a diamond crystal such as a high thermal conductivity ( 660 W/m.K versus 170 W/m.K for tungsten), high Debye temperature (1860K versus 379K tungsten) and the shortest lattice constant allow us to consider a thick diamond crystal (> 10mm) as a best candidate for a photon source. For axial orientation of such thick crystal only initial part of a crystal forms channeling radiation (around 0.5 mm for 10 GeV electrons); electrons emit coherent bremsstrahlung (CBS) in the remained part of a crystal. The model for estimation of radiation losses, mean photon energy and photon multiplicity in coherent bremsstrahlung processes is described in the report. The comparison of existing experimental results with developed approach has been performed. Our estimations show that for electron with energy 4.5 GeV passing through 10mm diamond target along < 111 > axis, the photon multiplicity may achieve 10 photons per each electron. The efficiency of positron production by a photon beam from a thick diamond target was estimated and possibility to achieve the efficiency about one accelerated positron per each initial electron with energy ~ 10 GeV was shown.

Paper Details

Date Published: 4 May 2007
PDF: 9 pages
Proc. SPIE 6634, International Conference on Charged and Neutral Particles Channeling Phenomena II, 663404 (4 May 2007); doi: 10.1117/12.741832
Show Author Affiliations
Alexander P. Potylitsyn, Tomsk Polytechnic Univ. (Russia)
Igor S. Tropin, Tomsk Polytechnic Univ. (Russia)

Published in SPIE Proceedings Vol. 6634:
International Conference on Charged and Neutral Particles Channeling Phenomena II
Sultan B. Dabagov, Editor(s)

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