25-30 September 2016
Europe/Rome timezone
deadline for abstracts has expired

Crystal parameters optimization for enhancement of deflection efficiency of fast charged particles

29 Sep 2016, 18:40


Mr Oleksiy Fomin (Laboratoire de l’Accélérateur Linéaire, CNRS et Université Paris-Sud, Orsay, France)


There are three fundamentally different mechanism of deflection of fast charged particle beam by a bent crystal. The first mechanism was proposed by E.A. Tsyganov [1], and is based on the phenomenon of planar channeling of charged particles in a bent crystal. The second, proposed by A.M. Taratin and S.A. Vorobiev [2], called the "volume reflection", is a single reflection of positive charged particles by bent crystal plane. And the third one, proposed by A.A. Greenenko and N.F. Shulga [3], is based on multiple stochastic scattering mainly above-barrier particles by atomic chains of a bent crystal. All these mechanisms have their advantages and disadvantages, and the choice of this or that mechanism should be based on a special analysis and optimization of all parameters for each mechanism separately and for each particular purpose. We present the results of such analysis and the search for optimal parameters, such as type of crystal, its orientation and bending, temperature effect and others to achieve the most efficient use of a bent crystal for deflection of fast charged particles. This analysis is based on computer simulation of the passage of relativistic charged particles through a bent crystal along crystallographic axes or planes. The usage of the binary collisions model allows to take into account the thermal vibrations of atoms in the crystal lattice in the most direct way and therefore, to analyze the temperature effects on the stability of the motion regime and efficiency of its use for particle deflection. Considering the crystal as a periodical 3d system of discrete atoms, this model allows to describe the transitions between different motion modes such as axis-plane in unified approach. These studies are conducted in the framework of the International Associated Laboratory "The development of detector systems for experiments in accelerators and technology for physics accelerators" (Ukraine-France) and provided by the grant support of the State Fund For Fundamental Research (project F64/17-2016) and the National Academy of Science of Ukraine (project F5-2016). References 1. E.N. Tsyganov, Preprint Fermilab TM-682, TM-684, (1976) 2. A.M. Taratin, S.A. Vorobiev, NIM B 26 (1987) 512 3. A.A. Greenenko, N.F. Shul’ga, JETP Lett. 54 (1991) 524

Primary author

Mr Oleksiy Fomin (Laboratoire de l’Accélérateur Linéaire, CNRS et Université Paris-Sud, Orsay, France)


Prof. Achille Stocchi (Laboratoire de l’Accélérateur Linéaire, CNRS et Université Paris-Sud, Orsay, France)

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