High-efficiency deflection of high-energy negative particles through axial channeling in a bent crystal

Deflection due to axial channeling in a silicon crystal bent along the [111] axis was observed for 150 GeV/c negative particles, mainly π− mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side with the efficiency of about 90% and with the peak position at th...

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Detalles Bibliográficos
Autores principales: Scandale, Walter, Vomiero, Alberto, Bagli, E, Baricordi, Stefano, Dalpiaz, Pietro, Fiorini, Massimiliano, Guidi, Vincenzo, Mazzolari, Andrea, Vincenzi, D, Milan, R, Della Mea, Gianantonio, Vallazza, Erik, Afonin, Alexander G, Chesnokov, Yury A, Maisheev, Vladimir A, Yazynin, Igor A, Golovatyuk, V M, Kovalenko, Alexander D, Taratin, Alexander M, Denisov, Alexander S, Gavrikov, Yury A, Ivanov, Yuri M, Lapina, Lyubov P, Malyarenko, Liudmila G, Skorobogatov, Vyacheslav V, Suvorov, Vsevolod M, Vavilov, Sergey A, Bolognini, Davide, Hasan, Said, Mattera, A, Prest, Michela, Shiraishi, S
Lenguaje:eng
Publicado: 2009
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1016/j.physletb.2009.09.009
http://cds.cern.ch/record/1281360
Descripción
Sumario:Deflection due to axial channeling in a silicon crystal bent along the [111] axis was observed for 150 GeV/c negative particles, mainly π− mesons, at one of the secondary beams of the CERN SPS. The whole beam was deflected to one side with the efficiency of about 90% and with the peak position at the bend crystal angle α=43 μrad. The deflection occurs mainly due to doughnut scattering of above-barrier particles by the atomic strings of the crystal. However, due to a high probability of particle recapture into bound states with the atomic strings their contribution to the deflection should be about 15% for our case according to simulation results.

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