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Title	Focusing of 180 GeV/c pions from a point-like source into a parallel beam by a bent silicon crystal
Author(s)	Scandale, W (CERN) ; Arduini, G (CERN) ; Cerutti, F (CERN) ; Garattini, M (CERN ; Imperial Coll., London) ; Gilardoni, S (CERN) ; Lechner, A (CERN) ; Losito, R (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Montesano, S (CERN) ; Natochii, A (CERN ; Orsay, LAL ; Taras Shevchenko U.) ; Redaelli, S (CERN) ; Rossi, R (CERN ; INFN, Rome) ; Smirnov, G (CERN) ; Breton, D (Orsay, LAL) ; Burmistrov, L (Orsay, LAL) ; Chaumat, V (Orsay, LAL) ; Dubos, S (Orsay, LAL) ; Maalmi, J (Orsay, LAL) ; Puill, V (Orsay, LAL) ; Stocchi, A (Orsay, LAL) ; Bagli, E (Ferrara U. ; INFN, Ferrara) ; Bandiera, L (Ferrara U. ; INFN, Ferrara) ; Romagnoni, M (Ferrara U. ; INFN, Ferrara) ; Guidi, V (Ferrara U. ; INFN, Ferrara) ; Mazzolari, A (Ferrara U. ; INFN, Ferrara) ; Murtas, F (CERN ; Frascati) ; Addesa, F (CERN ; INFN, Rome) ; Cavoto, G (INFN, Rome ; Rome U.) ; Iacoangeli, F (INFN, Rome) ; Galluccio, F (INFN, Naples) ; Afonin, A G (Serpukhov, IHEP) ; Chesnokov, Yu A (Serpukhov, IHEP) ; Durum, A A (Serpukhov, IHEP) ; Maisheev, V A (Serpukhov, IHEP) ; Sandomirskiy, Yu E (Serpukhov, IHEP) ; Yanovich, A A (Serpukhov, IHEP) ; Kovalenko, A D (Dubna, JINR) ; Taratin, A M (Dubna, JINR) ; Denisov, A S (St. Petersburg, INP) ; Gavrikov, Yu A (St. Petersburg, INP) ; Ivanov, Yu M (St. Petersburg, INP) ; Lapina, L P (St. Petersburg, INP) ; Malyarenko, L G (St. Petersburg, INP) ; Skorobogatov, V V (St. Petersburg, INP) ; Auzinger, G (Imperial Coll., London) ; Borg, J (Imperial Coll., London) ; James, T (Imperial Coll., London) ; Hall, G (Imperial Coll., London) ; Pesaresi, M (Imperial Coll., London)
Publication	2019
Number of pages	4
In:	Nucl. Instrum. Methods Phys. Res., B 446 (2019) 15-18
DOI	10.1016/j.nimb.2019.03.024
Subject category	Accelerators and Storage Rings ; Nuclear Physics - Experiment
Abstract	At large accelerators, bent crystals are employed to deflect weakly divergent proton beams at the stages of extraction and collimation. We demonstrate that a divergent particle beam may be efficiently deflected using a crystal with a focusing entry face. A 180 GeV/c pion beam with divergence near 0.060 mrad, which exceeds the Lindhard angle by a factor of 4, has been experimentally deflected by 0.25 mrad with efficiency near 22%. The proposed focusing crystal may serve as an element of a novel particle optics for secondary-particle beams in the TeV energy region.
Copyright/License	Elsevier B.V.

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