CERN Accelerating science


Channeling and volume reflection of high-energy charged particles in short bent crystals. Crystal assisted collimation of the accelerator beam halo / Scandale, W (CERN) ; Taratin, A M (Dubna, JINR)
The experimental studies of high-energy charged particle deflection due to planar and axial channeling as well as volume reflection and multi volume reflections in short bent crystals at the extracted beams of the CERN Super Proton Synchrotron (SPS) are considered. The experiments on the studies of crystal assisted collimation of the CERN SPS beam halo and the first similar experiment with the CERN Large Hadron Collider (LHC) beam of 6500 GeV/c protons are also considered..
2019 - 107 p. - Published in : Phys. Rep. 815 (2019) 1-107

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Automatic spike detection in beam loss signals for LHC collimator alignment / Azzopardi, Gabriella (U. Malta ; CERN) ; Valentino, Gianluca (U. Malta) ; Muscat, Adrian (U. Malta) ; Salvachua, Belen (CERN)
A collimation system is installed in the Large Hadron Collider to protect its super-conducting magnets and sensitive equipment from potentially dangerous beam halo particles. The collimator settings are determined following an alignment procedure, whereby collimator jaws are moved towards the beam until a suitable spike pattern, consisting of a sharp rise followed by a slow decay, is observed in nearby beam loss monitors. [...]
2019 - 9 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 934 (2019) 10-18

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Suppression of amplitude dependent closest tune approach and its behavior under forced oscillations / Persson, T (CERN) ; Tomás, R (CERN) ; Maclean, E H (CERN)
An amplitude dependent closest tune approach (ADeCTA) was first observed in the LHC in 2012. This potentially harmful effect can be generated by linear coupling in conjunction with octupoles. [...]
2019 - 6 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 051001 Fulltext from Publisher: PDF;

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An upgraded luminosity leveling procedure for the ALICE Experiment / de Cataldo, Giacinto (INFN, Bari ; CERN) ; Valentino, Gianluca (CERN ; U. Malta) ; Franco, Antonio (INFN, Bari ; CERN) ; Alemany, Reyes (CERN) ; Follin, Fabio (CERN) ; Hostettler, Michi (CERN ; U. Bern (main)) ; Wenninger, Jorg (CERN)
The Large Hadron Collider (LHC) Interface project (LHC_IF) ensures that the A Large Ion Collider Experiment (ALICE) can operate congruently and safely with the LHC in different machine configurations and beam modes. Measurements in proton–proton (pp) collisions are vital for ALICE and serve as a reference to calibrate the Pb ion–Pb ion (Pb–Pb) measurements. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 763-770

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Thermal study of the ironless inductive position sensors installed on the LHC collimators / Grima, Adrian (U. Malta ; CERN) ; Di Castro, Mario (CERN) ; Masi, Alessandro (CERN) ; Sammut, Nicholas (Malta U. ; CERN)
The safe operation of the European Organization for Nuclear Research Large Hadron Collider relies on a complex system for equipment protection. An essential part of machine protection is the collimation system since it is used to protect the equipment from beam losses. [...]
2019 - 8 p. - Published in : IEEE Trans. Nucl. Sci. 66 (2019) 688-695

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Validation of energy deposition simulations for proton and heavy ion losses in the CERN Large Hadron Collider / Lechner, A (CERN) ; Auchmann, B (CERN) ; Baer, T (CERN) ; Bahamonde Castro, C (CERN) ; Bruce, R (CERN) ; Cerutti, F (CERN) ; Esposito, L S (CERN) ; Ferrari, A (CERN) ; Jowett, J M (CERN) ; Mereghetti, A (CERN) et al.
Monte Carlo shower simulations are essential for understanding and predicting the consequences of beam losses in high-energy proton and ion colliders. Shower simulations are routinely used at CERN for estimating the beam-induced energy deposition, radiation damage, and radioactivity in the Large Hadron Collider (LHC). [...]
2019 - 24 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 071003 Fulltext from Publisher: PDF;

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Proceedings of the 2019 MPP Workshop / Strachinescu, Sabina-Ioana (National School of Political and Administrative Studies Bucharest (RO)) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
This report contains the proceedings of the MPP Workshop on LHC Machine Protection, held in Bogis-Bossey from 7th to 8th of May [...]
- 2019. - 24 p.
Full text

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Mechanical analysis of the collaring process of the 11 T dipole magnet / Ferracin, Paolo (CERN) ; Bottura, Luca (CERN) ; Bourcey, Nicolas (CERN) ; Daly, Michael (CERN) ; Devred, Arnaud (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Ferradas Troitino, Jose (CERN) ; Ferradas Troitino, Salvador (CERN) ; Grosclaude, Philippe (CERN) ; Guinchard, Michael (CERN) et al.
As part of the Large Hadron Collider (LHC) accelerator upgrades foreseen by the high luminosity-LHC project, the CERN 11 T program is aimed at replacing standard LHC Nb-Ti main dipole magnets, operating with a bore field of 8.3 T, with pairs of shorter Nb$_3$Sn dipole magnets with a bore field of 11 T and the same total integrated field, thus providing space for additional collimators in the dispersion suppressor region. At the time of the submission of this paper, six single-aperture and two double-aperture short models have been fabricated and tested. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4002705

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Data-driven cross-talk modeling of beam losses in LHC collimators / Azzopardi, Gabriella (CERN ; U. Malta) ; Salvachua, Belen (CERN) ; Valentino, Gianluca (U. Malta)
The Large Hadron Collider at CERN is equipped with a collimation system to intercept potentially dangerous beam halo particles before they damage its sensitive equipment. The collimator settings are determined following a beam-based alignment procedure, in which the collimator jaws are moved towards the beam until losses appear in the beam loss monitors. [...]
2019 - 11 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 083002 Fulltext: PDF;

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LHC injection losses for tighter collimator settings in view of the HE-LHC / Crouch, Matthew Paul (CERN) ; Bartmann, Wolfgang (CERN)
In view of the smaller physical apertures of Nb3Sn magnets for the HE-LHC study, a machine study was performed in the LHC to tighten correspondingly the ring and injection protection collimators and measure the change in loss behaviour [...]
- 2019. - 8 p.

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