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CERN Accelerating science

Published Articles

Letzte Einträge:
2021-04-22
12:04
A Timing, Trigger, and Control System With Picosecond Precision Based on 10 Gbit/s Passive Optical Networks for High-Energy Physics / Mendes, Eduardo (CERN) ; Baron, Sophie (CERN) ; Soos, Csaba (CERN) ; Vasey, Francois (CERN)
The Large Hadron Collider (LHC) experiments will have their timing, trigger, and control (TTC) system upgraded as a consequence of the need for higher bandwidth and components which are obsolete. In this article, we present a TTC based on passive optical networks (PONs). [...]
2021 - 11 p. - Published in : IEEE Trans. Nucl. Sci. 68 (2021) 447-457 Fulltext: PDF;

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2021-04-22
12:04
A pulsed high-voltage decelerator system to deliver low-energy antiprotons / Husson, A (IJCLab, Orsay) ; Kim, B H (Seoul Natl. U., Dept. Phys. Astron.) ; Welker, A (CERN) ; Charlton, M (Swansea U.) ; Choi, J J (Seoul Natl. U., Dept. Phys. Astron.) ; Chung, M (UNIST, Ulsan) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, Saclay) ; Crépin, P -P (Paris, Lab. Kastler Brossel) ; Crivelli, P (Zurich, ETH-CSCS/SCSC) et al.
The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. [...]
2021 - 7 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1002 (2021) 165245

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2021-04-22
12:04
Phase transition and shadow behaviors of quintessential black holes in M-theory/superstring inspired models / Belhaj, A (Rabat U.) ; El Balali, A (Rabat U.) ; El Hadri, W (Rabat U.) ; Hassouni, Y (Rabat U.) ; Torrente-Lujan, E (Murcia U. ; CERN)
We study d-dimensional black holes surrounded by dark energy (DE), embedded in D-dimensional M-theory/superstring inspired models having AdS$_d × 𝕊^{d+k}$ space–time where $D = 2d + k$. We focus first on the thermodynamical Hawking–Page phase transitions, whose microscopical origin is linked to $N$ coincident ($d − 2$)-branes supposed to live in such inspired models. [...]
2021 - 28 p. - Published in : Int. J. Mod. Phys. A 36 (2021) 2150057

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2021-04-22
12:04
Parametric FEM modeling of multilayer castellated canted cosine theta (CCT) magnets / Ortwein, Rafal (Cracow, INP) ; Kirby, Glyn (CERN)
Canted cosine theta (CCT) magnets have received increased attention in the recent years due to their inherent characteristics of high field quality and low conductor stresses, as each turn is supported by the metallic former. CCT geometry is suitable for complex magnets—such as nested dipoles, which allow full 360° control of the magnetic field direction. [...]
2021 - 30 p. - Published in : Supercond. Sci. Technol. 34 (2021) 055008

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2021-04-22
12:04
Multimodal simulation of large area silicon photomultipliers for time resolution optimization / Sánchez, David (ICC, Barcelona U.) ; Gómez, Sergio (ICC, Barcelona U.) ; Fernández-Tenllado, José María (ICC, Barcelona U. ; CERN) ; Ballabriga, Rafael (CERN) ; Campbell, Michael (CERN) ; Gascón, David (ICC, Barcelona U.)
The Silicon Photomultiplier (SiPM) sensor is replacing the extensive use of the Photomultiplier Tube (PMT) in fast timing applications. These photo-sensors can be applied in different fields such as medical imaging systems like Positron Emission Tomography (PET), LIDAR technologies or High Energy Physics (HEP) experiments. [...]
2021 - 11 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1001 (2021) 165247

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2021-04-22
12:04
Impact of betatron collimation losses in the High-Energy Large Hadron Collider / Varasteh, M (CERN) ; Bruce, R (CERN) ; Cerutti, F (CERN) ; Crouch, M (CERN) ; Zimmermann, F (CERN)
In response to recommendations in the 2013 update of the European Strategy for Particle Physics, a conceptual design effort for an energy upgrade of the Large Hadron Collider (LHC) at CERN, the so-called high-energy LHC (HE-LHC), was launched as part of the Future Circular Collider study. The HE-LHC machine, which is meant to use 16 T magnet technologies in the existing LHC tunnel, would provide proton collisions at a center-of-mass energy of 27 TeV (∼2×LHC) with a total stored energy of 1.34 GJ (∼4×LHC) per beam. [...]
2021 - 12 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 041601 Fulltext from Publisher: PDF;

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2021-04-22
12:04
Wake-function, impedance, and energy loss determination for two countermoving particle beams / Teofili, L (U. Rome La Sapienza (main) ; INFN, Rome ; CERN) ; Arpaia, P (Naples U. ; CERN) ; Giordano, F (Naples U. ; CERN) ; Lamas, I (CERN) ; Rumolo, G (CERN) ; Salvant, B (CERN) ; Zannini, C (CERN) ; Migliorati, M (U. Rome La Sapienza (main) ; INFN, Rome)
This paper deals with the determination of the wake-function, impedance and energy loss due to surrounding accelerator components of two countermoving beams, i.e., two beams moving in opposite directions. Differently from the classical case, the distance between source and test charges cannot be considered constant. [...]
2021 - 19 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 041001 Fulltext from Publisher: PDF;

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2021-04-22
12:04
Supervised learning-based reconstruction of magnet errors in circular accelerators / Fol, E (CERN ; Frankfurt U.) ; Tomás, R (Frankfurt U.) ; Franchetti, G (Frankfurt U. ; Darmstadt, GSI)
Magnetic field errors and misalignments cause optics perturbations, which can lead to machine safety issues and performance degradation. The correlation between magnetic errors and deviations of the measured optics functions from design can be used in order to build supervised learning models able to predict magnetic errors directly from a selection of measured optics observables. [...]
2021 - 19 p. - Published in : Eur. Phys. J. Plus 136 (2021) 365 Fulltext: PDF;

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2021-04-22
12:04
Experimental Evidence for Common Driving Effects in Low-Energy Fission from Sublead to Actinides / Schmitt, C (Strasbourg, IPHC) ; Lemasson, A (GANIL) ; Schmidt, K H (Erzhausen, Germany) ; Jhingan, A (IUAC, New Delhi) ; Biswas, S (GANIL) ; Kim, Y H (Laue-Langevin Inst.) ; Ramos, D (GANIL) ; Andreyev, A N (York U., England ; JAERI, Tokai ; CERN) ; Curien, D (Strasbourg, IPHC) ; Ciemala, M (Cracow, INP) et al.
Isotopic distributions of fragments from fission of the neutron-deficient $^{178}$Hg nuclide are reported. This experimental observable is obtained for the first time in the region around lead using an innovative approach based on inverse kinematics and the coincidence between the large acceptance magnetic spectrometer VAMOS++ and a new detection arm close to the target. [...]
2021 - 6 p. - Published in : Phys. Rev. Lett. 126 (2021) 132502 Fulltext from Publisher: PDF;

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2021-04-22
12:04
On the mechanisms governing the critical current reduction in Nb$_{3}$Sn Rutherford cables under transverse stress / De Marzi, Gianluca (ENEA, Frascati ; CERN) ; Bordini, Bernardo (CERN) ; Baffari, Dario (CERN)
Within the framework of the HiLumi-LHC project, CERN is currently manufacturing 11 T dipole and quadrupole accelerator magnets using state-of-the-art Nb$_{3}$Sn Rutherford cables. Even higher magnetic fields are considered by the Hadron Future Circular Collider (FCC-hh) design study, which plans to develop 16 T Nb$_{3}$Sn bending dipoles. [...]
2021 - 15 p. - Published in : Sci. Rep. 11 (2021) 7369 Fulltext: PDF;

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