CERN Accelerating science


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A VdM Sequence File Web Application (report) / Marqversen, Frederik Kofoed ; Hickman, Thomas Kendall
To perform Van der Meer scans at the LHC, the experimental collaborations have to supply a text file containing a command sequence specifying the beam positions required. [...]
- 2019.
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Dynamic Response of Advanced Materials Impacted by Particle Beams: The MultiMat Experiment / Pasquali, M (CERN) ; Bertarelli, A (CERN) ; Accettura, C (CERN ; Milan Polytechnic) ; Berthome, E (CERN) ; Bianchi, L (CERN) ; Bolz, P (Darmstadt, GSI) ; Carra, F (CERN) ; Fichera, C (BIAM, St Paul lez Durance) ; Frankl, M I (CERN) ; Furness, T (Huddersfield U.) et al.
The introduction at CERN of new extremely energetic particle accelerators, such as the high-luminosity large hadron collider (HL-LHC) or the proposed future circular collider (FCC), will increase the energy stored in the circulating particle beams by almost a factor of two (from 360 to 680 MJ) and of more than 20 (up to 8500 MJ), respectively. In this scenario, it is paramount to assess the dynamic thermomechanical response of materials presently used, or being developed for future use, in beam intercepting devices (such as collimators, targets, dumps, absorbers, spoilers, windows, etc.) exposed to potentially destructive events caused by the impact of energetic particle beams. [...]
publ - 30 p. - Published in : Journal of Dynamic Behavior of Materials 5 (2019) 266-295 External link: Fulltext from publisher

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Multiobjective genetic algorithm approach to optimize beam matching and beam transport in high-intensity hadron linacs / Yarmohammadi Satri, M (CERN ; IPM, Tehran) ; Lombardi, A M (CERN) ; Zimmermann, F (CERN)
In this article we demonstrate how a multiobjective genetic algorithm, like the nondominated sorting genetic algorithm II (NSGAII), and a selection tool, like the technique for order preference by similarity to ideal solution (TOPSIS), can be employed for beam matching and for optimizing the beam transport in the low and medium energy section of a modern hadron linac including space charge effect. Combining NSGAII with the particle tracking code TRAVEL v4.07, we determine the Pareto optimal front, and then apply TOPSIS for the final selection using the example of the 160 MeV H$^−$ LINAC4 at CERN. [...]
2019 - 10 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 054201 Fulltext from Publisher: PDF;

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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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Cryogenic Hear and Masse Transfer Conference - CHMT 2019   4 - 5 Nov 2019  - Enschede, Netherlands  .-
2019 Conference home page

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Noninvasive 3D field mapping of complex static electric fields / Kainz, Andreas (TU Vienna) ; Keplinger, Franz (TU Vienna) ; Hortschitz, Wilfried (Danube U., Krems) ; Kahr, Matthias (Danube U., Krems) ; Steiner, Harald (Danube U., Krems) ; Stifter, Michael (Danube U., Krems) ; Hunt, James R (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Resta-Lopez, Javier (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Rodin, Volodymyr (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Welsch, Carsten P (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) et al.
Many upcoming experiments in antimatter research require low-energy antiproton beams. With a kinetic energy in the order of 100 keV, the standard magnetic components to control and focus the beams become less effective. [...]
2019 - 6 p. - Published in : Phys. Rev. Lett. 122 (2019) 244801 Article from SCOAP3: PDF;

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Design optimization and evaluation of the 3 kA MgB$_2$ cable at 4.3 K for the superconducting link project at CERN / Konstantopoulou, K (CERN) ; Hurte, J (CERN) ; Retz, P W (CERN) ; Ballarino, A (CERN)
High-current superconducting links (SC links) are being developed at CERN for powering the superconducting magnets of the High-Luminosity Large Hadron Collider upgrade. The links contain MgB$_2$ cables, each about 100 m long, rated at currents of up to 18 kA. [...]
2019 - 10 p. - Published in : Supercond. Sci. Technol. 32 (2019) 085003

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Transient heat transfer in superfluid helium cooled Nb$_3$Sn superconducting coil samples / Xavier, Mário D Grosso (CERN) ; Schundelmeier, Jens (CERN) ; Winkler, Tiemo (CERN) ; Koettig, Torsten (CERN) ; van Weelderen, Rob (CERN) ; Bremer, Johan (CERN)
An experimental setup is operational at the Central Cryogenics Laboratory of the European Organization for Nuclear Research to measure the cooling mechanisms of superfluid $^4$He (He II) from prepared Rutherford-type superconducting cable stacks to a stagnant He II bath. For novel magnets designed for the so-called high-luminosity large hadron collider upgrade, a segment of a fully impregnated Nb$_3$Sn 11T dipole magnet was measured. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 9500105

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Superconducting detector magnets baseline designs for particle physics experiments at the Future Circular Collider / Bielert, Erwin (CERN ; Illinois U., Urbana (main)) ; Berriaud, Christophe (Saclay) ; Cure, Benoit (CERN) ; Dudarev, Alexey (CERN) ; Gaddi, Andrea (CERN) ; Gerwig, Hubert (CERN) ; Ilardi, Veronica (Twente U., Enschede ; CERN) ; Klyukhin, Vyacheslav (Lomonosov Moscow State U. ; CERN) ; Kulenkampff, Tobias K D (CERN ; TU Vienna) ; Mentink, Matthias (CERN) et al.
In early 2014 a design study started at CERN for a Future Circular Collider. A new tunnel with a circumference of about 100 km for the collider magnets is foreseen as well as new general-purpose particle detectors to probe electron-positron (e$^-$e$^+$), electron-hadron (eh), and hadron-hadron (hh) collisions, housed in large underground caverns. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4500305

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Modeling of beam loss induced quenches in the LHC main dipole magnets / Breschi, Marco (U. Bologna (main)) ; Felcini, Enrico (CERN) ; Breccia, Francesca (U. Bologna (main)) ; Granieri, P P (CERN) ; Bergonzoni, Eleonora (U. Bologna (main)) ; Bevilacqua, Alessandro (U. Bologna (main)) ; Galassi, Pietro (U. Bologna (main)) ; Winkler, Tiemo (Twente U., Enschede) ; Bottura, Luca (CERN)
The full energy exploitation of the Large Hadron Collider (LHC), a planned increase of the beam energy beyond the present 6.5 TeV, will result in more demanding working conditions for the superconducting dipoles and quadrupoles operating in the machine. It is hence crucial to analyze, understand, and predict the quench levels of these magnets for the required values of current and generated magnetic fields. [...]
2019 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4004407

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