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Please use this identifier to cite or link to this item: https://elib.bsu.by/handle/123456789/258180
Title: Steering of Sub-GeV electrons by ultrashort Si and Ge bent crystals
Authors: Sytov, A. I.
Bandiera, L.
De Salvador, D.
Mazzolari, A.
Bagli, E.
Berra, A.
Carturan, S.
Durighello, C.
Germogli, G.
Guidi, V.
Klag, P.
Lauth, W.
Maggioni, G.
Prest, M.
Romagnoni, V.
Tikhomirov, V. V.
Vallazza, E.
Issue Date: 2017
Publisher: Springer New York LLC
Citation: Eur Phys J C 2017;77(12).
Abstract: We report the observation of the steering of 855 MeV electrons by bent silicon and germanium crystals at the MAinzer MIkrotron. Crystals with 15 μ m of length, bent along (111) planes, were exploited to investigate orientational coherent effects. By using a piezo-actuated mechanical holder, which allowed to remotely change the crystal curvature, it was possible to study the steering capability of planar channeling and volume reflection vs. the curvature radius and the atomic number, Z. For silicon, the channeling efficiency exceeds 35%, a record for negatively charged particles. This was possible due to the realization of a crystal with a thickness of the order of the dechanneling length. On the other hand, for germanium the efficiency is slightly below 10% due to the stronger contribution of multiple scattering for a higher-Z material. Nevertheless this is the first evidence of negative beam steering by planar channeling in a Ge crystal. Having determined for the first time the dechanneling length, one may design a Ge crystal based on such knowledge providing nearly the same channeling efficiency of silicon. The presented results are relevant for crystal-based beam manipulation as well as for the generation of e.m. radiation in bent and periodically bent crystals
URI: https://elib.bsu.by/handle/123456789/258180
DOI: 10.1140/epjc/s10052-017-5456-7
Scopus: 85039039839
Sponsorship: We acknowledge partial support by the European Commission through the PEARL Project within the H2020-MSCA-RISE-2015 call, GA n. 690991 and by the INFN-AXIAL experiment. We also acknowledge the CINECA award under the ISCRA initiative for the availability of high performance computing resources and support. E. Bagli, L. Bandiera and A. Mazzolari recognize the partial support of FP7-IDEAS-ERC CRYSBEAM project GA n. 615089. We acknowledge Professor H. Backe for fruitful discussions and M.Rampazzo, A. Pitacco and A. Minarello for technical assistance in dynamic holder realization.
Appears in Collections:Статьи НИУ «Институт ядерных проблем»

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