1. Measurements of multiple scattering of high energy protons in bent silicon crystals
- Author
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Vincent Chaumat, Stefano Redaelli, Alexander M. Taratin, A.A. Durum, S.B. Dabagov, Vincenzo Guidi, Mark Pesaresi, Andrea Mazzolari, Laura Bandiera, Gianluca Valentino, G. Cavoto, G. Arduini, Yuri M. Ivanov, S. Montesano, Walter Scandale, P. Schoofs, V. Puill, F. Galluccio, Enrico Bagli, Fabrizio Murtas, Jihane Maalmi, Francesco Iacoangeli, Francesco Cerutti, Achille Stocchi, Alexander G. Afonin, Mark Butcher, Yu. A. Chesnokov, Alexander S. Denisov, Vyacheslav V. Skorobogatov, M. Garattini, Thomas James, Anton Lechner, V. A. Maisheev, Alessandro Masi, M. Raymond, L. Burmistrov, D. Breton, F. Addesa, S. Dubos, A.A. Yanovich, Roberto Losito, G. Germogli, Roberto Rossi, Geoff Hall, Lyubov P. Lapina, Simone Gilardoni, Daniele Mirarchi, Liudmila G. Malyarenko, Yu.E. Sandomirskiy, Alexander Kovalenko, George Smirnov, Yu.A. Gavrikov, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
Nuclear and High Energy Physics ,Silicon ,silicon: bent crystal ,deflection ,[PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph] ,Bent molecular geometry ,chemistry.chemical_element ,01 natural sciences ,Collimated light ,NO ,Crystal ,p: angular distribution ,0103 physical sciences ,Channeling ,Multiple scattering ,Instrumentation ,p: multiple scattering ,[PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] ,numerical calculations ,Nuclear Experiment ,010306 general physics ,Physics ,010308 nuclear & particles physics ,Scattering ,CERN SPS ,Charged particle ,Amorphous solid ,CERN LHC Coll ,chemistry ,Deflection (physics) ,Physics::Accelerator Physics ,Atomic physics ,p: channeling ,scattering: Coulomb - Abstract
International audience; The ordered positions of atoms in crystals give a reason to study multiple Coulomb scattering of high energy charged particles within them. In addition, the accurate representation of multiple scattering of high energy protons in a bent crystal is important for studies of crystal assisted collimation at the SPS and the LHC. Multiple scattering of 400 GeV/c protons in bent silicon crystals was measured for orientations far from the directions of main crystallographic planes and axes in conditions excluding channeling of protons. The observed RMS widths of the angular distributions are a little larger than those obtained from the Moliere theory. Simulation of multiple scattering in a model of binary collisions with the crystal atoms shows about 3.5% decrease of the RMS deflection with respect to the model of a sequence of random collisions. We consider this as a possible indication of a reduction of multiple scattering of protons in a crystal in comparison with its amorphous state.
- Published
- 2017