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1. Observation of strong reduction of multiple scattering for channeled particles in bent crystals

Author

W. Scandale, G. Arduini, F. Cerutti, M. Garattini, S. Gilardoni, R. Losito, A. Masi, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, G. Smirnov, D. Breton, L. Burmistrov, V. Chaumat, S. Dubos, J. Maalmi, V. Puill, A. Stocchi, E. Bagli, L. Bandiera, M. Romagnoni, V. Guidi, A. Mazzolari, F. Murtas, F. Addesa, G. Cavoto, F. Iacoangeli, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V.V. Skorobogatov, G. Auzinger, J. Borg, T. James, G. Hall, and M. Pesaresi

Subjects
Physics, QC1-999
Abstract

Strong reduction of multiple scattering for channeled particles has been observed in an experiment on the deflection of a 180 GeV/c π+-meson beam by bent silicon crystals. The RMS deflections due to multiple scattering for the channeled particles were about six times smaller than for non-channeled ones. It was shown that the approach suggested recently for the description of multiple scattering for channeled particles using the experimental data for random crystal orientations gives fair agreement with the experiment. Keywords: Crystal, Channeling, Multiple scattering, Dechanneling, Beam deflection

Published
2020
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2. High-efficiency deflection of high energy protons due to channeling along the 〈110〉 axis of a bent silicon crystal

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, A. Masi, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, G. Smirnov, D. Breton, L. Burmistrov, V. Chaumat, S. Dubos, J. Maalmi, V. Puill, A. Stocchi, E. Bagli, L. Bandiera, G. Germogli, V. Guidi, A. Mazzolari, S. Dabagov, F. Murtas, F. Addesa, G. Cavoto, F. Iacoangeli, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V.V. Skorobogatov, T. James, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Crystal, Channeling, Beam deflection, Physics, QC1-999
Abstract

A deflection efficiency of about 61% was observed for 400 GeV/c protons due to channeling, most strongly along the 〈110〉 axis of a bent silicon crystal. It is comparable with the deflection efficiency in planar channeling and considerably larger than in the case of the 〈111〉 axis. The measured probability of inelastic nuclear interactions of protons in channeling along the 〈110〉 axis is only about 10% of its amorphous level whereas in channeling along the (110) planes it is about 25%. High efficiency deflection and small beam losses make this axial orientation of a silicon crystal a useful tool for the beam steering of high energy charged particles.

Published
2016
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3. Observation of channeling for 6500 GeV/c protons in the crystal assisted collimation setup for LHC

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, R. Losito, A. Masi, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, G. Valentino, D. Breton, L. Burmistrov, V. Chaumat, S. Dubos, J. Maalmi, V. Puill, A. Stocchi, E. Bagli, L. Bandiera, G. Germogli, V. Guidi, A. Mazzolari, S. Dabagov, F. Murtas, F. Addesa, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, A.S. Denisov, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, L.G. Malyarenko, V.V. Skorobogatov, T. James, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Accelerator, Beam collimation, Crystal, Channeling, Physics, QC1-999
Abstract

Two high-accuracy goniometers equipped with two bent silicon crystals were installed in the betatron cleaning insertion of the CERN Large Hadron Collider (LHC) during its long shutdown. First beam tests were recently performed at the LHC with 450 GeV/c and 6500 GeV/c stored proton beams to investigate the feasibility of beam halo collimation assisted by bent crystals. For the first time channeling of 6500 GeV/c protons was observed in a particle accelerator. A strong reduction of beam losses due to nuclear inelastic interactions in the aligned crystal in comparison with its amorphous orientation was detected. The loss reduction value was about 24. Thus, the results show that deflection of particles by a bent crystal due to channeling is effective for this record particle energy.

Published
2016
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4. Observation of strong leakage reduction in crystal assisted collimation of the SPS beam

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, R. Losito, A. Masi, A. Mereghetti, E. Metral, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, E. Bagli, L. Bandiera, S. Baricordi, P. Dalpiaz, G. Germogli, V. Guidi, A. Mazzolari, D. Vincenzi, G. Claps, S. Dabagov, D. Hampai, F. Murtas, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, J. Fulcher, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Accelerator, Beam collimation, Crystal, Channeling, Physics, QC1-999
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.

Published
2015
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5. Observation of nuclear dechanneling length reduction for high energy protons in a short bent crystal

Author

W. Scandale, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, L. Lari, A. Lechner, R. Losito, A. Masi, A. Mereghetti, E. Metral, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, E. Bagli, L. Bandiera, S. Baricordi, P. Dalpiaz, G. Germogli, V. Guidi, A. Mazzolari, D. Vincenzi, G. Claps, S. Dabagov, D. Hampai, F. Murtas, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, I.A. Yazynin, A.D. Kovalenko, A.M. Taratin, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, W. Ferguson, J. Fulcher, G. Hall, M. Pesaresi, M. Raymond, D. Bolognini, S. Hasan, M. Prest, and E. Vallazza

Subjects
Physics, QC1-999
Abstract

Deflection of 400 GeV/c protons by a short bent silicon crystal was studied at the CERN SPS. It was shown that the dechanneling probability increases while the dechanneling length decreases with an increase of incident angles of particles relative to the crystal planes. The observation of the dechanneling length reduction provides evidence of the particle population increase at the top levels of transverse energies in the potential well of the planar channels. Keywords: Crystal, Channeling, Beam, Deflection

Published
2015
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6. Corrigendum to 'Observation of strong leakage reduction in crystal assisted collimation of the SPS beam' [Phys. Lett. B 748 (2015) 451–454]

Author

W. Scandale, F. Andrisani, G. Arduini, M. Butcher, F. Cerutti, M. Garattini, S. Gilardoni, A. Lechner, R. Losito, A. Masi, A. Mereghetti, E. Metral, D. Mirarchi, S. Montesano, S. Redaelli, R. Rossi, P. Schoofs, G. Smirnov, E. Bagli, L. Bandiera, S. Baricordi, P. Dalpiaz, G. Germogli, V. Guidi, A. Mazzolari, D. Vincenzi, G. Claps, S. Dabagov, D. Hampai, F. Murtas, G. Cavoto, F. Iacoangeli, L. Ludovici, R. Santacesaria, P. Valente, F. Galluccio, A.G. Afonin, Yu.A. Chesnokov, A.A. Durum, V.A. Maisheev, Yu.E. Sandomirskiy, A.A. Yanovich, A.D. Kovalenko, A.M. Taratin, Yu.A. Gavrikov, Yu.M. Ivanov, L.P. Lapina, J. Fulcher, G. Hall, M. Pesaresi, and M. Raymond

Subjects
Physics, QC1-999
Published
2015
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