CERN Accelerating science

HL-LHC Papers

Darreres entrades:
2022-01-12
06:18
Development of a rotating-coil scanner for superconducting accelerator magnets / Rogacki, Piotr (CERN ; RWTH Aachen U.) ; Fiscarelli, Lucio (CERN) ; Russenschuck, Stephan (CERN) ; Hameyer, Kay (RWTH Aachen U.)
The High-Luminosity upgrade project for the Large Hadron Collider (HL-LHC) at CERN (Conseil Européen pour la Recherche Nucléaire) will require new superconducting magnets for the insertion regions. Among these magnets, the new triplet quadrupoles, based on Nb3Sn technology, require magnetic-field measurements of a high precision in the field angle and multipole field errors. [...]
2020 - 9 p. - Published in : J. Sensors Sensor Syst. 9 (2020) 99-107 Fulltext: PDF;

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2021-12-15
10:40
Nonlinear dynamics of proton beams with hollow electron lens in the CERN high-luminosity LHC / Mirarchi, D (CERN ; U. Manchester (main)) ; Appleby, R B (U. Manchester (main) ; Cockcroft Inst. Accel. Sci. Tech.) ; Bruce, R (CERN) ; Giovannozzi, M (CERN) ; Mereghetti, A (CERN) ; Redaelli, S (CERN) ; Stancari, G (Fermilab)
The design stored beam energy in the CERN high-luminosity large hadron collider (HL-LHC) upgrade is about 700 MJ, with about 36 MJ in the beam tails, according to estimates based on scaling considerations from measurements at the LHC. Such a large amount of stored energy in the beam tails poses serious challenges on its control and safe disposal. In particular, orbit jitters can cause significant losses on primary collimators, which can lead to accidental beam dumps, magnet quenches, or even permanent damage to collimators and other accelerator elements. [...]
FERMILAB-PUB-21-713-AD.- 2021 - 28 p. - Published in : Eur. Phys. J. Plus 137 (2021) 7 Fulltext from Publisher: PDF;

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2021-11-04
06:02
Flow pattern observations and flow pattern map for adiabatic two-phase flow of carbon dioxide in vertical upward and downward direction / Schmid, David (CERN ; Ecole Polytechnique, Lausanne) ; Verlaat, Bart (CERN) ; Petagna, Paolo (CERN) ; Revellin, Rémi (INSA, Villeurbanne) ; Schiffmann, Jürg (Ecole Polytechnique, Lausanne)
A test facility to investigate flow pattern transitions of vertical two-phase flow of CO2 has been built within the scope of the high-luminosity detector upgrades at the European Organization for Nuclear Research (CERN). Adiabatic flow pattern observations for both vertical up- and downflow are recorded with high-speed imaging in tubes of 8 mm inner diameter, with saturation temperatures in the range of −25◦C to +5◦C and mass velocities ranging from 100 kg m$^{-2}$ s$^{-1}$ to 450 kg m$^{-2}$ s$^{-1}$. A database of 431 flow pattern observations in upward and 123 in downward direction has been compiled. [...]
2022 - 16 p. - Published in : Experimental Thermal and Fluid Science 131 (2022) 110526 Fulltext: PDF;

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2021-10-16
04:12
Gegenbauer Goldstones / Durieux, Gauthier (CERN) ; McCullough, Matthew (CERN) ; Salvioni, Ennio (CERN ; U. Padua, Dept. Phys. Astron.)
We investigate radiatively stable classes of pseudo-Nambu-Goldstone boson (pNGB) potentials for approximate spontaneously broken $\mathrm{SO}(N+1)\to\mathrm{SO}(N)$. Using both the one-loop effective action and symmetry, it is shown that a Gegenbauer polynomial potential is radiatively stable, being effectively an `eigenfunction' from a radiative perspective. [...]
arXiv:2110.06941; CERN-TH-2021-141.- 2022-01-14 - 22 p. - Published in : JHEP 2201 (2022) 076 Fulltext: 2110.06941 - PDF; document - PDF;

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2021-10-06
06:16
A Revised Version of the ATLAS Tile Calorimeter Link Daughterboard for the HL-LHC / Santurio, Eduardo Valdes (Stockholm U. (main)) ; Silverstein, Samuel (Stockholm U. (main)) ; Bohm, Christian (Stockholm U. (main)) ; Dunne, Katherine (Stockholm U. (main)) ; Lee, Suhyun (Stockholm U. (main)) ; Motzkau, Holger (Stockholm U. (main))
The ATLAS Tile Calorimeter (TileCal) readout link and control daughterboard (DB) is the central on-detector hub of the new TileCal electronics upgrade for the high-luminosity large hadron collider (HL-LHC). The DB, which has undergone gradual redesigns during development, provides the connection between the on- and off-detector electronics via bidirectional fiber-optic links. [...]
2021 - 7 p. - Published in : IEEE Trans. Nucl. Sci. 68 (2021) 2414-2420 Fulltext: PDF;

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2021-10-06
06:16
Beam-induced surface modifications as a critical source of heat loads in the Large Hadron Collider / Petit, Valentine (CERN) ; Taborelli, Mauro (CERN) ; Zanin, Danilo Andrea (CERN) ; Himmerlich, Marcel (CERN) ; Neupert, Holger (CERN) ; Chiggiato, Paolo (CERN) ; Iadarola, Giovanni (CERN)
Beam-induced heat loads on the cryogenic regions of the Large Hadron Collider (LHC) exhibit a wide and unexpected dispersion along the accelerator, with potential impact on the performance of its High-Luminosity upgrade. Studies related the heat load source to the avalanche multiplication of electrons at the surface of the beam vacuum chamber, a phenomenon known as electron could build-up. [...]
2021 - 10 p. - Published in : Commun. Phys. 4 (2021) 192 Fulltext: PDF;

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2021-10-05
07:50
“Block-Type” Coils Fabrication Procedure for the Nb$_3$Sn Dipole Magnet FRESCA2 / Rondeaux, F (Saclay) ; Ferracin, P (CERN) ; Durante, M (Saclay) ; Gauthier, R (CERN) ; Manil, P (Saclay) ; Munoz Garcia, J E (Saclay) ; Perez, J C (CERN) ; Rifflet, J -M (Saclay) ; de Rijk, G (CERN) ; Rochepault, E (CERN) et al.
The Nb$_3$Sn FRESCA2 dipole magnet is dedicated to upgrade the CERN cable test facility FRESCA. It is also a technological demonstrator of large-aperture Nb$_3$Sn accelerator magnet. [...]
2016 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 26 (2016) 4002405

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2021-10-05
06:04
Use of High Resolution DAQ System to Aid Diagnosis of HD2b, a High Performance Nb$_3$Sn Dipole / Lizarazo, J (LBNL, Berkeley) ; Doering, D (LBNL, Berkeley) ; Doolittle, L (LBNL, Berkeley) ; Galvin, J (LBNL, Berkeley) ; Caspi, S (LBNL, Berkeley) ; Dietderich, D R (LBNL, Berkeley) ; Felice, H (LBNL, Berkeley) ; Ferracin, P (LBNL, Berkeley) ; Godeke, A (LBNL, Berkeley) ; Joseph, J M (LBNL, Berkeley) et al.
A novel voltage monitoring system to record voltage transients in superconducting magnets is being developed at LBNL . This system has 160 monitoring channels capable of measuring differential voltages of up to 1.5 kV with 100 kHz bandwidth and 500 kS/s digitizing rate. [...]
2009 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 19 (2009) 2345-2349

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2021-10-05
06:04
Development of the 15 T $\hbox{Nb}_{3}\hbox{Sn}$ Dipole HD2 / Ferracin, P (LBNL, Berkeley) ; Caspi, S (LBNL, Berkeley) ; Cheng, D W (LBNL, Berkeley) ; Dietderich, D R (LBNL, Berkeley) ; Hafalia, A R (LBNL, Berkeley) ; Hannaford, C R (LBNL, Berkeley) ; Higley, H (LBNL, Berkeley) ; Lietzke, A F (LBNL, Berkeley) ; Lizarazo, J (LBNL, Berkeley) ; McInturff, A D (LBNL, Berkeley) et al.
The Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) is continuing the development of HD2, a 1 m long $\hbox{Nb}_{3}\hbox{Sn}$ dipole generating a dipole field of 15 T in a 36 mm clear bore. With tilted (flared) ends to avoid obstructing the beam path, HD2 represents a step towards the development of high field and cost effective accelerator quality magnets. [...]
2008 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 18 (2008) 277-280

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2021-10-05
06:04
Recent Test Results of the High Field ${\rm Nb}_{3}{\rm Sn}$ Dipole Magnet HD2 / Ferracin, P (LBNL, Berkeley) ; Bingham, B (LBNL, Berkeley) ; Caspi, S (LBNL, Berkeley) ; Cheng, D W (LBNL, Berkeley) ; Dietderich, D R (LBNL, Berkeley) ; Felice, H (LBNL, Berkeley) ; Hafalia, A R (LBNL, Berkeley) ; Hannaford, C R (LBNL, Berkeley) ; Joseph, J (LBNL, Berkeley) ; Lietzke, A F (LBNL, Berkeley) et al.
The 1 m long Nb$_3$Sn dipole magnet HD2, fabricated and tested at Lawrence Berkeley National Laboratory, represents a step towards the development of block-type accelerator quality magnets operating in the range of 13-15 T. The magnet design features two coil modules composed of two layers wound around a titanium-alloy pole. [...]
2010 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 20 (2010) 292-295

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