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Title: | Comparative results on collimation of the SPS beam of protons and Pb ions with bent crystals |
Authors: | Scandale, Walter Arduini, Gianluigi Assmann, Ralph W. Bracco, Chiara Cerutti, Francesco Christiansen, Jorgen Gilardoni, Simone S. Laface, Emanuele Losito, Roberto Masi, Alessandro Metral, Elias Mirarchi, Daniele Montesano, Simone Previtali, Valentina Redaelli, Stefano Valentino, Gianluca Schoofs, Philippe Smirnov, George I. Tlustos, Lukas Bagli, Enrico Baricordi, Stefano Dalpiaz, Pietro F. Guidi, Vincenzo Mazzolari, Andrea Vincenzi, Donato Dabagov, Sultan B. Murtas, Fabrizio Carnera, Alberto Mea, Gianantoniodella De Salvador, Davide Lombardi, Augusto Lytovchenko, O. Tonezzer, Michele Cavoto, G. Ludovici, Lucio Santacesaria, Roberta Valente, Paolo Galluccio, Francesca Afonin, Alexander G. Bulgakov, M. K. Chesnokov, Yu A. Maisheev, Vladimir A. Yazynin, Igor A. Kovalenko, Alexander Dmitrievich Taratin, Alexander M. Uzhinskiy, Vladimir V. Gavrikov, Yu A. Ivanov, Yuri M. Lapina, Lyubov P. Skorobogatov, Vyacheslav V. Ferguson, W. Fulcher, Jonathan Richard Hall, Geoff N. Pesaresi, Mark Raymond, Mark V. Rose, Alec W. Ryan, Matt J. Zorba, O. Robert-Demolaize, Guillaume Markiewicz, Thomas Walter Oriunno, Marco Wienands, U. |
Keywords: | Colliders (Nuclear physics) Particle accelerators Proton beams -- Measurement Proton synchrotron colliders |
Issue Date: | 2011 |
Publisher: | Elsevier B.V. |
Citation: | Scandale, W., Arduini, G., Assmann, R., Bracco, C., Cerutti, F., Christiansen, J.,...Wienands, U. (2011). Comparative results on collimation of the SPS beam of protons and pb ions with bent crystals. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 703(5), 547-551. |
Abstract: | New experiments on crystal assisted collimation have been carried out at the CERN SPS with stored beams of 120 GeV/. c protons and Pb ions. Bent silicon crystals of 2 mm long with about 170 μrad bend angle and a small residual torsion were used as primary collimators. In channeling conditions, the beam loss rate induced by inelastic interactions of particles with the crystal nuclei is minimal. The loss reduction was about 6 for protons and about 3 for Pb ions. Lower reduction value for Pb ions can be explained by their considerably larger ionization losses in the crystal. In one of the crystals, the measured fraction of the Pb ion beam halo deflected in channeling conditions was 74%, a value very close to that for protons. The intensity of the off-momentum halo leaking out from the collimation station was measured in the first high dispersion area downstream. The particle population in the shadow of the secondary collimator-absorber was considerably smaller in channeling conditions than for amorphous orientations of the crystal. The corresponding reduction was in the range of 2-5 for both protons and Pb ions. |
URI: | https://www.um.edu.mt/library/oar//handle/123456789/28266 |
Appears in Collections: | Scholarly Works - FacICTCCE |
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