# Published Articles

2022-05-17
20:50
 Free Molecule Studies by Perturbed $\gamma - \gamma$ Angular Correlation: A New Path to Accurate Nuclear Quadrupole Moments / Haas, Heinz (CERN ; U. Aveiro (main)) ; Röder, Jens (CERN ; U. Aveiro (main)) ; Correia, Joao G (CERN ; IST, Lisbon (main)) ; Schell, J (CERN ; U. Duisburg-Essen) ; Fenta, Abel S (U. Aveiro (main)) ; Vianden, Reiner (Bonn U., HISKP) ; Larsen, Emil M H (U. Copenhagen (main)) ; Aggelund, Patrick A (U. Copenhagen (main)) ; Fromsejer, Rasmus (U. Copenhagen (main)) ; Hemmingsen, Lars B S (U. Copenhagen (main)) et al. Accurate nuclear quadrupole moment values are essential as benchmarks for nuclear structure models and for the interpretation of experimentally determined nuclear quadrupole interactions in terms of electronic and molecular structure. Here, we present a novel route to such data by combining perturbed γ-γ angular correlation measurements on free small linear molecules, realized for the first time within this work, with state-of-the-art ab initio electronic structure calculations of the electric field gradient at the probe site. [...] 2021 - 6 p. - Published in : Phys. Rev. Lett. 126 (2021) 103001 Fulltext: PDF;

2022-05-17
20:50
 Applying Model Checking to Highly-Configurable Safety Critical Software: The SPS-PPS PLC Program / Fernández Adiego, Borja (CERN) ; Blanco Viñuela, Enrique (CERN) ; Havart, Frederic (CERN) ; Ladzinski, Tomasz (CERN) ; Lopez-Miguel, Ignacio D (CERN) ; Tournier, Jean-Charles (CERN) An important aspect of many particle accelerators is the constant evolution and frequent configuration changes that are needed to perform the experiments they are designed for. This often leads to the design of configurable software that can absorb these changes and perform the required control and protection actions. [...] 2022 - 5 p. - Published in : JACoW ICALEPCS 2021 (2022) 759-763 Fulltext: PDF; In : 18th International Conference on Accelerator and Large Experimental Physics Control Systems, Online, 18 - 22 Oct 2021, pp.759-763

2022-05-17
20:50
 Association rules extraction for the identification of functional dependencies in complex technical infrastructures / Antonello, Federico (Milan, Polytech.) ; Baraldi, Piero (Milan, Polytech.) ; Shokry, Ahmed (Milan, Polytech. ; Ec. Polytech., Palaiseau (main)) ; Zio, Enrico (Milan, Polytech. ; Paris, Ecole des Mines ; Kyung Hee U.) ; Gentile, Ugo (CERN) ; Serio, Luigi (CERN) This work proposes a method for identifying functional dependencies among components of complex technical infrastructures using databases of alarm messages. The developed method is based on the representation of the alarm database by a binary matrix, the use of the Apriori algorithm for mining association rules and a new algorithm for identifying groups of functionally dependent components. [...] 2021 - Published in : Reliable Eng. Sys. Safety 209 (2021) 107305

2022-05-17
20:50
 Search by triplet: An efficient local track reconstruction algorithm for parallel architectures / Cámpora Pérez, Daniel Hugo (Maastricht U. ; Nikhef, Amsterdam) ; Neufeld, Niko (CERN) ; Riscos Núñez, Agustín (Seville U.) Millions of particles are collided every second at the LHCb detector placed inside the Large Hadron Collider at CERN. The particles produced as a result of these collisions pass through various detecting devices which will produce a combined raw data rate of up to 40 Tbps by 2021. [...] 2021 - Published in : J. Comput. Sci. 54 (2021) 101422

2022-05-17
20:50
 Characterization of data compression across CPU platforms and accelerators / Promberger, Laura (CERN ; U. Heidelberg, ZITI) ; Schwemmer, Rainer (CERN) ; Fröning, Holger (U. Heidelberg, ZITI) The ever increasing amount of generated data makes it more and more beneficial toutilize compression to trade computations for data movement and reduced storagerequirements.Lately,dedicatedacceleratorshavebeenintroducedtooffloadcompres-sion tasks from the main processor. However, research is lacking when it comes to thesystem costs for incorporating compression. [...] 2021 - 17 p. - Published in : 10.1002/cpe.6465 Fulltext: PDF;

2022-05-17
20:50
 Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems / McNair, Sophie A M (Bath U.) ; Chaharsooghi, Alborz Shokrani (Bath U.) ; Carnevale, Mauro (Bath U.) ; Rhead, Andrew (Bath U.) ; Onnela, Antti (CERN) ; Daguin, Jerome (CERN) ; Cichy, Kamil (CERN) ; Postema, Hans (Cornell U.) ; Bacchetta, Nicola (CERN) ; French, Thomas (CERN) et al. Small diameter thin-walled pipes, typically with a diameter less than 20 mm and a ratio of outer diameter to wall thickness is 20 or above, have increasingly become a key value adding factor for a number of industries including medical applications, electronics and chemical industries. In high-energy physics experiments, thin-walled pipes are needed in tracking detector cooling systems where the mass of all components needs to be minimised for physics measurement reasons. [...] 2021 - 15 p. - Published in : Int. J. Adv. Manuf. Technol. 118 (2021) 667-681 Fulltext: PDF;

2022-05-17
20:50
 A semi-empirical model for preheater design to trigger CO$_2$ boiling for detector cooling / Baldinelli, G (INFN, Perugia ; U. Perugia (main)) ; French, T (CERN) ; Bianchi, F (INFN, Perugia ; Perugia U.) ; Daguin, J (CERN) ; Onnela, A (CERN) ; Tropea, P (CERN) The fluid properties of CO$_2$ make it an ideal medium for the cooling of tracking detectors in experiments at particle accelerators. Detectors such as the Compact Muon Solenoid Outer Tracker at CERN will be cooled to a nominal temperature of -35 °C with CO$_2$ cooling to ensure the longevity of the silicon sensors. [...] 2021 - 10 p. - Published in : Int. J. Refrigeration 128 (2021) 12-21

2022-05-17
20:50
 Very high upper critical fields and enhanced critical current densities in Nb$_3$Sn superconductors based on Nb–Ta–Zr alloys and internal oxidation / Buta, F (U. Geneva (main)) ; Bonura, M (U. Geneva (main)) ; Matera, D (U. Geneva (main)) ; Bovone, G (U. Geneva (main)) ; Ballarino, A (CERN) ; Hopkins, S C (CERN) ; Bordini, B (CERN) ; Chaud, X (Natl. High Mag. Field Lab.) ; Senatore, C (U. Geneva (main)) The inhibition of Nb$_3$Sn grain growth in the presence of ZrO$_2$ nanoparticles appears to be one of the most promising method for pushing the critical current densities of Nb$_3$Sn superconducting wires to levels that meet the requirements set for the Future Circular Collider. We have investigated the effect of ZrO$_2$ nanoparticles formed by the internal oxidation of Zr on the superconducting properties and microstructure of Nb3Sn formed from Nb-1 wt%Zr, Nb-7.5 wt%Ta, Nb-7.5 wt%Ta-1 wt%Zr and Nb-7.5 wt%Ta-2 wt%Zr alloys. [...] 2021 - 14 p. - Published in : J. Phys. Mater. 4 (2021) 025003 Fulltext: PDF;

2022-05-17
20:50
 Operating Temperature Range of Phosphorous-Doped Optical Fiber Dosimeters Exploiting Infrared Radiation-Induced Attenuation / Morana, A (Lab. Hubert Curien, St. Etienne) ; Campanella, C (Lab. Hubert Curien, St. Etienne) ; Marin, E (Lab. Hubert Curien, St. Etienne) ; Melin, G (FOTON, Lannion) ; Robin, T (FOTON, Lannion) ; Li Vecchi, G (CERN ; Lab. Hubert Curien, St. Etienne) ; Di Francesca, D (CERN ; Lab. Hubert Curien, St. Etienne) ; Boukenter, A (Lab. Hubert Curien, St. Etienne) ; Ouerdane, Y (Lab. Hubert Curien, St. Etienne) ; Mady, F (INPHYNI, Nice) et al. Point or distributed optical fiber (OF)-based dosimeters can exploit the observed linear dependence of the radiation-induced attenuation (RIA) at 1550 nm in phosphosilicate OFs to monitor the total ionizing dose (TID). The temperature dependence of the radiation sensitivity coefficients at 1550 nm (expressed in dB km$^{-1}$ Gy$^{-1}$) of three phosphorus-doped single-mode OFs has been investigated between -80 °C and 300 °C for TID ranging from 1 Gy to 1 kGy(SiO$_2$). [...] 2021 - 7 p. - Published in : IEEE Trans. Nucl. Sci. 68 (2021) 906-912

2022-05-17
20:50
 Effects of saturation temperature on the boiling properties of carbon dioxide in small diameter pipes at low vapour quality: Heat transfer coefficient / Hellenschmidt, D (CERN) ; Petagna, P (CERN) The renewed interest in carbon dioxide as a refrigerant stems from both the environmental friendly properties of this fluid and from its extremely favourable performance as compared to most standard refrigerants at the same temperature, in particular for all applications where small size evaporators are required. Since a dependable forecast of heat transfer is crucial for these applications and reliable predictive methods spanning a large temperature range are so far missing, a long-term study has been launched to create a consistent and reliable experimental database studying the peculiarities of boiling carbon dioxide in mini- and micro-channels, aiming at a future improvement of predictive models. This study presents results on the local heat transfer coefficient of boiling carbon dioxide at low vapour quality (0 < x < 0.4) in 200 mm-long stainless steel tubes with inner diameters of 2.15 mm, 1 mm and 0.5 mm. [...] 2021 - 19 p. - Published in : Int. J. Heat Mass Transf. 172 (2021) 121094 Fulltext: PDF;

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