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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.
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