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Multiple scattering of positively charged particles moving near the (111) plane in a silicon single crystal
/ Scandale, W (Imperial Coll., London) ; Cerutti, F (CERN) ; Esposito, L S (CERN) ; Garattini, M (CERN) ; Gilardoni, S (CERN) ; Losito, R (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Redaelli, S (CERN) ; Smirnov, G (CERN) et al.
The article is devoted to the study of the suppression of multiple scattering of positively charged particles with momenta of 180 GeV/c and 400 GeV/c passing through bent single crystals of silicon at small angles to the plane (111) both in channeling mode and in the above-barrier state. For the first time, the suppression of the effect of multiple scattering of non-channeling particles passing at a small angle to one of the planes of a silicon single crystal was observed. [...]
Germany : Springer Nature, 2024 - 6 p.
- Published in : Eur. Phys. J. Plus 139 (2024) 1041
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Channeling performance of bent crystals developed at CERN
/ Rodin, Volodymyr (CERN) ; Esposito, Luigi Salvatore (CERN) ; Lechner, Anton (CERN) ; Demassieux, Quentin (CERN) ; Matheson, Eloise (CERN) ; Solis Paiva, Santiago (CERN) ; Seidenbinder, Regis (CERN) ; Aberle, Oliver (CERN) ; Perillo Marcone, Antonio (CERN) ; Calviani, Marco (CERN) et al.
Bent crystals are a mature technology used in several applications at CERN, such as the crystal-assisted collimation system for LHC ion operation and reduction of losses during the slow extraction from the SPS by shadowing the electrostatic septum. In the future, it is planned to measure electric and magnetic dipole moments of short-lived particles with a double-crystal experiment in the LHC. [...]
2024 - 4 p.
- Published in : JACoW IPAC 2024 (2024) THPS39
Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.THPS39
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Operational performance of crystal collimation with 6.37 $Z$ TeV Pb ion beams at the LHC
/ D'Andrea, M (CERN) ; Aberle, O (CERN) ; Bruce, R (CERN) ; Butcher, M (CERN) ; Di Castro, M (CERN) ; Cai, R (CERN) ; Lamas, I (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Redaelli, S (CERN) et al.
The concept of crystal collimation relies on the use of bent crystals to coherently deflect positively charged particles with suitable impact conditions by trapping them in the potential well generated by adjacent crystalline planes. The resulting deflection is much higher than what can be achieved by multiple scattering on amorphous materials. [...]
2024 - 16 p.
- Published in : Phys. Rev. Accel. Beams 27 (2024) 011002
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Beam merging assisted by a bent crystal
/ Scandale, W (Imperial Coll., London ; INFN, Rome) ; Cerutti, F (CERN) ; Esposito, L S (CERN) ; Gilardoni, S (CERN) ; Losito, R (CERN) ; Smirnov, G I (CERN) ; Giribono, A (Frascati) ; Bauce, M (INFN, Rome) ; Collamati, F (INFN, Rome) ; Valente, P (INFN, Rome) et al.
Bunch merging is a well-established technique to increase the intensity of synchrotrons and the luminosity of circular colliders. We suggest to exploit a combination of channeling, volume reflection and amorphous interactions in a bent crystal for beam merging in a transfer line. [...]
2023 - 6 p.
- Published in : Eur. Phys. J. Plus 138 (2023) 981
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Track reconstruction and analysis of particle interactions in short bent crystals
/ Rossi, R (CERN ; Imperial Coll., London) ; Esposito, L S (CERN) ; Pesaresi, M (Imperial Coll., London) ; Hall, G (Imperial Coll., London) ; Scandale, W (Imperial Coll., London ; INFN, Rome)
Measurements of the interaction of positively charged particles with bent crystals wereobtained by developing a new and consolidated analysis method, for the use of UA9 collaboration.The method was deployed to characterize crystals with a length of a few mm along the beamdirection and a bending angle in the order of 10 μrad to 100 μrad, typicallyexploited in the CERN accelerators. To assess their properties and quality, the crystals havebeen investigated in the Super Proton Synchrotron North Area with a beam of mixed hadrons at180 GeV. [...]
2023 - 18 p.
- Published in : JINST 18 (2023) P06027
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EuPRAXIA – a compact, cost-efficient particle and radiation source
/ Weikum, M K (DESY) ; Akhter, T (INFN, Naples) ; Alesini, P D (LNF, Dafne Light) ; Alexandrova, A S (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Anania, M P (LNF, Dafne Light) ; Andreev, N E (Lebedev Inst. ; Moscow, MIPT) ; Andriyash, I (SOLEIL, Saint-Aubin) ; Aschikhin, A (DESY) ; Assmann, R W (DESY) ; Audet, T (LPGP, Orsay) et al.
Plasma accelerators present one of the most suitable candidates for the development of more compact particle
acceleration technologies, yet they still lag behind radiofrequency (RF)-based devices when it comes to beam quality,
control, stability and power efficiency. The Horizon 2020-funded project EuPRAXIA (“European Plasma Research
Accelerator with eXcellence In Applications”) aims to overcome the first three of these hurdles by developing a
conceptual design for a first international user facility based on plasma acceleration. [...]
2019 - 9 p.
- Published in : AIP Conf. Proc. 2160 (2019) 040012
In : 25th Conference on Application of Accelerators in Research and Industry (CAARI 2018), Grapevine, TX, United States, 12 - 17 Aug 2018, pp.040012
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Dechanneling of high energy particles in a long bent crystal
/ 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) et al.
Experimental results on deflection of a 180 GeV/c $\pi^+$-meson beam by a 23 mm long bent silicon crystal are
analyzed to study the dechanneling process of particles due to multiple scattering. A new approach for the
determination of contributions from atomic nuclei and electrons to the multiple scattering using the experimental data for random crystal orientations is suggested. [...]
2019 - 4 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 438 (2019) 38-41
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Beam Losses, Lifetime and Collimator Hierarchy
/ Bruce, R (CERN) ; D'Andrea, N (CERN) ; Martinez, A Fuster (CERN) ; Gorzawski, A (CERN) ; Mereghetti, A (CERN) ; Mirarchi, D (CERN) ; Patecki, M (CERN) ; Rossi, R (CERN) ; Salvachua Ferrando, B M (CERN) ; Camillocci, M Solfaroli (CERN) et al.
The aim of the LHC collimation system is to ensure a safe machine operation; it
provides the LHC with passive protection and minimises the risk of magnet
quenches induced by beam losses. In 2017, the LHC collimation system confirmed
its excellent performance, with no magnet quenches due to losses from
circulating beams while accommodating changes in machine configurations [...]
2019 - 8 p.
- Published in : (2019) , pp. 85-92
Fulltext: PDF;
In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.85-92
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