CERN Accelerating science

HL-LHC Papers

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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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2021-10-06
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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2021-09-30
10:19
Discovering heavy neutrino oscillations in rare $B^\pm_c$ meson decays at HL-LHCb / Tapia, Sebastian (Iowa State U.) ; Vidal-Bravo, Marcelo (Andres Bello Natl. U. ; Unlisted, CL) ; Zamora-Saa, Jilberto (Andres Bello Natl. U. ; Unlisted, CL)
In this work, we study the lepton flavor and lepton number violating $B_{c}$ meson decays via two intermediate on-shell Majorana neutrinos $N_j$ into two charged leptons and a charged pion $B_{c}^{\pm} \to \mu^{\pm} \ N_j \to \mu^{\pm} \tau^{\pm} \pi^{\mp}$. [...]
arXiv:2109.06027.
- 15 p.
Fulltext

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2021-09-20
08:47
Conceptual design of an off-momentum collimation system in the CERN Super Proton Synchrotron for High-Luminosity Large Hadron Collider proton beams / Patecki, Marcin (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN)
The CERN accelerator complex is undergoing an upgrade in order to meet the requirements of the High-Luminosity Large Hadron Collider (HL-LHC). One of the key needs is to increase the intensity of beams injected into the LHC from the current $1.15 \times 10^{11}$ to $2.3 \times 10^{11}$ $p^+ $ /bunch. [...]
2021 - 14 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 093002 Fulltext: PDF;

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2021-09-08
07:22
An Ultra-Low Temperature Transcritical R744 Refrigeration System for Future Detectors at CERN LHC / Barroca, Pierre (Norwegian U. Sci. Tech.) ; Hafner, Armin (Norwegian U. Sci. Tech.) ; Verlaat, Bart (CERN) ; Petagna, Paolo (CERN) ; Hulek, Wojciech (CERN) ; Zwalinski, Lukasz (CERN) ; Hanf, Pierre (CERN) ; Battistin, Michele (CERN) ; Davoine, Loic (CERN) ; Teixeira, Daniella (Cape Town U., Dept. Math.)
The cooling systems of the future tracking detectors of the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN will be entirely based on CO$_2$ refrigeration technology. The system is a booster refrigeration system, composed of a two stage primary part with transcritical R744 equipment and a low temperature secondary CO2 pumped loop. [...]
2021 - 15 p. - Published in : Appl. Sciences 11 (2021) 7399 Fulltext: PDF;

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