First results on the SPS beam collimation with bent crystals

Journal Article · Mon Aug 23 04:00:00 EDT 2010 · Physics Letters, (Section) B

DOI:https://doi.org/10.1016/j.physletb.2010.07.023· OSTI ID:993472

Scandale, W; Robert-Demolaize, G; Arduini, G; Assmann, R; Bracco, C; Gilardoni, S; Ippolito, V; Laface, E; Losito, R; Masi, A; Metral, E; Previtali, V; Redaelli, S; Silari, M; Tlustos, L; Bagli, E; Baricordi, S; Dalpiaz, P; Guidi, V; Mazzolari, A ; Vincenzi, D; Della Mea, G; Lombardi, A; De Salvador, D; Vallazza, E; Bolognini, D; Hasan, S; Lietti, D; Mascagna, V; Mattera, A; Prest, M; Cavoto, G; Ludovici, L; Mirarchi, D; Santacesaria, R; Valente, P; Murtas, F; Afonin, A G; Chesnokov, Yu A; Maisheev, V A; Yazynin, I A; Kovalenko, A D; Taratin, A M; Denisov, A S; Gavrikov, Yu A; Ivanov, Yu M; Lapina, L P; Malyarenko, L G; Skorobogatov, V V; Suvorov, V M; Vavilov, S A; Mokhov, N; Still, D; Markiewicz, T; Oriunno, M

Experiments were performed at the CERN SPS with 120 GeV/c stored proton beams to assess the possibility of beam halo collimation assisted by bent crystals. A bent crystal was used to deflect horizontally by an angle of about 170 {micro}rad the beam halo protons in channeling states directing them into a 60 cm long tungsten absorber. The halo loss rate due to nuclear inelastic interactions of protons in the aligned crystal was up to five times smaller than for its amorphous orientation. Channeled fractions, (75 {+-} 4)% and (85 {+-} 5)% for the two tested silicon crystals, were measured by intercepting the deflected beam with another collimator located between the crystals and the absorber. The pixel detector (MEDIPIX) installed in a Roman pot inside the beam pipe was used to obtain visual images of the deflected beam.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: DOE - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 993472
• Report Number(s): BNL--94329-2010-JA; KB0202011
• Journal Information: Physics Letters, (Section) B, Journal Name: Physics Letters, (Section) B Journal Issue: 2 Vol. 692; ISSN 0370-2693; ISSN PYLBAJ
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CERN
CHANNELING
COLLIMATORS
ORIENTATION
PROTON BEAMS
PROTONS
SILICON
TUNGSTEN