CERN Accelerating science

Article
Title	Observation of strong leakage reduction in crystal assisted collimation of the SPS beam
Author(s)	Scandale, W (CERN ; Orsay, LAL ; INFN, Rome) ; Arduini, G (CERN) ; Butcher, M (CERN) ; Cerutti, F (CERN) ; Garattini, M (CERN) ; Gilardoni, S (CERN) ; Lechner, A (CERN) ; Losito, R (CERN) ; Masi, A (CERN) ; Mereghetti, A (CERN) ; Metral, E (CERN) ; Mirarchi, D (CERN ; Imperial Coll., London) ; Montesano, S (CERN) ; Redaelli, S (CERN) ; Rossi, R (CERN ; INFN, Rome) ; Schoofs, P (CERN) ; Smirnov, G (CERN) ; Bagli, E (Ferrara U. ; INFN, Ferrara) ; Bandiera, L (Ferrara U. ; INFN, Ferrara) ; Baricordi, S (Ferrara U. ; INFN, Ferrara) ; Dalpiaz, P (Ferrara U. ; INFN, Ferrara) ; Germogli, G (Ferrara U. ; INFN, Ferrara) ; Guidi, V (Ferrara U. ; INFN, Ferrara) ; Mazzolari, A (Ferrara U. ; INFN, Ferrara) ; Vincenzi, D (Ferrara U. ; INFN, Ferrara) ; Claps, G (LNF, Dafne Light) ; Dabagov, S (LNF, Dafne Light ; Lebedev Inst. ; Moscow Phys. Eng. Inst.) ; Hampai, D (LNF, Dafne Light) ; Murtas, F (LNF, Dafne Light) ; Cavoto, G (INFN, Rome) ; Iacoangeli, F (INFN, Rome) ; Ludovici, L (INFN, Rome) ; Santacesaria, R (INFN, Rome) ; Valente, P (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) ; Gavrikov, Yu A (St. Petersburg, INP) ; Ivanov, Yu M (St. Petersburg, INP) ; Lapina, L P (St. Petersburg, INP) ; Fulcher, J (Imperial Coll., London) ; Hall, G (Imperial Coll., London) ; Pesaresi, M (Imperial Coll., London) ; Raymond, M (Imperial Coll., London)
Publication	2015
Number of pages	4
In:	Phys. Lett. B 748 (2015) pp.451-454 Phys. Lett. B 750 (2015) pp.666
DOI	10.1016/j.physletb.2015.07.040 10.1016/j.physletb.2015.09.001 (Corrigendum)
Subject category	Accelerators and Storage Rings
Abstract	In ideal two-stage collimation systems, the secondary collimator–absorber should have its length sufficient to exclude practically the exit of halo particles with large impact parameters. In the UA9 experiments on the crystal assisted collimation of the SPS beam a 60 cm long tungsten bar is used as a secondary collimator–absorber which is insufficient for the full absorption of the halo protons. Multi-turn simulation studies of the collimation allowed to select the position for the beam loss monitor downstream the collimation area where the contribution of particles deflected by the crystal in channeling regime but emerging from the secondary collimator–absorber is considerably reduced. This allowed observation of a strong leakage reduction of halo protons from the SPS beam collimation area, thereby approaching the case with an ideal absorber.
Copyright/License	publication: © 2015-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³

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