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Wistisen TN, Mikkelsen RE, Uggerhøj UI, Wienands U, Markiewicz TW, Gessner S, Hogan MJ, Noble RJ, Holtzapple R, Tucker S, Guidi V, Mazzolari A, Bagli E, Bandiera L, Sytov A. Observation of Quasichanneling Oscillations. Phys Rev Lett 2017; 119:024801. [PMID: 28753348 DOI: 10.1103/physrevlett.119.024801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Indexed: 06/07/2023]
Abstract
We report on the first experimental observations of quasichanneling oscillations, recently seen in simulations and described theoretically. Although above-barrier particles penetrating a single crystal are generally seen as behaving almost as in an amorphous substance, distinct oscillation peaks nevertheless appear for particles in that category. The quasichanneling oscillations were observed at SLAC National Accelerator Laboratory by aiming 20.35 GeV positrons and electrons at a thin silicon crystal bent to a radius of R=0.15 m, exploiting the quasimosaic effect. For electrons, two relatively faint quasichanneling peaks were observed, while for positrons, seven quasichanneling peaks were clearly identified.
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Affiliation(s)
- T N Wistisen
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark
| | - R E Mikkelsen
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark
| | - U I Uggerhøj
- Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark
| | - U Wienands
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - T W Markiewicz
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S Gessner
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M J Hogan
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R J Noble
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Holtzapple
- California Polytechnic State University, San Luis Obispo, California 93407, USA
| | - S Tucker
- California Polytechnic State University, San Luis Obispo, California 93407, USA
| | - V Guidi
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - A Mazzolari
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - E Bagli
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - L Bandiera
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - A Sytov
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
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Wienands U, Markiewicz TW, Nelson J, Noble RJ, Turner JL, Uggerhøj UI, Wistisen TN, Bagli E, Bandiera L, Germogli G, Guidi V, Mazzolari A, Holtzapple R, Miller M. Observation of deflection of a beam of multi-GeV electrons by a thin crystal. Phys Rev Lett 2015; 114:074801. [PMID: 25763959 DOI: 10.1103/physrevlett.114.074801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Indexed: 06/04/2023]
Abstract
We report on an experiment performing channeling and volume reflection of a high-energy electron beam using a quasimosaic, bent silicon (111) crystal at the End Station A Test Beam at SLAC. The experiment uses beams of 3.35 and 6.3 GeV. In the channeling orientation, deflections of the beam of 400 μrad for both energies with about 22% efficiency are observed, while in the volume-reflection orientation, deflection of the beam by 120 μrad at 3.35 GeV and by 80 μrad at 6.3 GeV is observed with 86%-95% efficiency. Quantitative measurements of the channeling efficiency, surface transmission, and dechanneling length are taken. These are the first quantitative measurements of channeling and volume reflection using a primary beam of multi-GeV electrons.
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Affiliation(s)
- U Wienands
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - T W Markiewicz
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Nelson
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R J Noble
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J L Turner
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - U I Uggerhøj
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade 120, DK-8000 Aarhus, Denmark
| | - T N Wistisen
- Department of Physics and Astronomy, University of Aarhus, Ny Munkegade 120, DK-8000 Aarhus, Denmark
| | - E Bagli
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - L Bandiera
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - G Germogli
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - V Guidi
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - A Mazzolari
- Department of Physics and Earth Sciences of the University of Ferrara, and INFN Section of Ferrara, Via Saragat 1/C, I-44122 Ferrara, Italy
| | - R Holtzapple
- California Polytechnic State University, San Luis Obispo, California 93407, USA
| | - M Miller
- California Polytechnic State University, San Luis Obispo, California 93407, USA
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