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First observation of multiple volume reflection by different planes in one bent silicon crystal for high-energy protons |
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| Authors: | W. Scandale A. Vomiero E. Bagli S. Baricordi P. Dalpiaz M. Fiorini V. Guidi A. Mazzolari D. Vincenzi R. Milan Gianantonio Della Mea E. Vallazza A.G. Afonin Yu.A. Chesnokov V.A. Maisheev I.A. Yazynin V.M. Golovatyuk A.D. Kovalenko A.M. Taratin A.S. Denisov Yu.A. Gavrikov Yu.M. Ivanov L.P. Lapina L.G. Malyarenko V.V. Skorobogatov V.M. Suvorov S.A. Vavilov D. Bolognini S. Hasan A. Mattera M. Prest V.V. Tikhomirov |
| Affiliation: | 1. CERN, European Organization for Nuclear Research, CH-1211 Geneva 23, Switzerland;2. INFM-CNR, Via Vallotti 9, 25133 Brescia, Italy;3. INFN Sezione di Ferrara, Dipartimento di Fisica, Università di Ferrara, Via Saragat 1, 44100 Ferrara, Italy;4. INFN Laboratori Nazionali di Legnaro, Viale Università 2, 35020 Legnaro (PD), Italy;5. Dipartimento di Ingegneria dei Materiali e Tecnologie Industriali, Università di Trento, Via Mesiano 77, 38050 Trento, Italy;6. INFN Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy;g Institute of High Energy Physics, Moscow Region, RU-142284 Protvino, Russia;h Joint Institute for Nuclear Research, Joliot-Curie 6, 141980, Dubna, Moscow Region, Russia;i Petersburg Nuclear Physics Institute, 188300 Gatchina, Leningrad Region, Russia;j Università dell''Insubria, Via Valleggio 11, 22100 Como, Italy;k INFN Sezione di Milano Bicocca, Piazza della Scienza 3, 20126 Milano, Italy;l Research Institute for Nuclear Problems, Belarusian State University, 220030 Minsk, Belarus |
| Abstract: | Multiple volume reflection by different planes in a bent silicon crystal with its 〈111〉 axis orientation close to the beam direction was observed for the first time for 400 GeV/c protons at the CERN SPS. The proton beam was deflected to the side opposite to the crystal bend by an angle of about 67 μrad, which is five times larger than in a single volume reflection by the (110) bent planes. The registered efficiency of one side deflection was about 84%. It was shown that multiple volume reflection transforms to a single volume reflection when the orientation angle of the 〈111〉 axis relative to the beam direction is increased. |
| Keywords: | 61.85.+p |
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