Journal
PHYSICS LETTERS B
Volume 714, Issue 2-5, Pages 231-236Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2012.07.006
Keywords
Accelerator; Beam collimation; Crystal; Channeling
Funding
- Russian Foundation for Basic Research [05-02-17622, 06-02-16912]
- RF President Foundation [SS-3383.2010.2]
- LHC Program of Presidium of Russian Academy of Sciences [RFBR-CERN 12-02-91532]
- MIUR [FIRB RBFR085M0L_001/I11J10000090001]
- Eu-CARD program [GA 227579]
- UK Science and Technology Research Council
- US DOE
- Science and Technology Facilities Council [ST/K001256/1, CMS] Funding Source: researchfish
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A study of crystal assisted collimation has been continued at the CERN SPS for different energies of stored beams using 120 GeV/c and 270 GeV/c protons and Pb ions with 270 GeV/c per charge. A bent silicon crystal used as a primary collimator deflected halo particles using channeling and directing them into the tungsten absorber. A strong correlation of the beam losses in the crystal and off-momentum halo intensity measured in the first high dispersion (HD) area downstream was observed. In channeling conditions, the beam loss rate induced by inelastic interactions of particles with nuclei is significantly reduced in comparison with the non-oriented crystal. A maximal reduction of beam losses in the crystal larger than 20 was observed with 270 GeV/c protons. The off-momentum halo intensity measured in the HD area was also strongly reduced in channeling conditions. The reduction coefficient was larger than 7 for the case of Pb ions. A strong loss reduction was also detected in regions of the SPS ring far from the collimation area. It was shown by simulations that the miscut angle between the crystal surface and its crystallographic planes doubled the beam losses in the aligned crystal. (C) 2012 Elsevier B.V. All rights reserved.
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