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1.
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Manufacture and performance test result of a 95 kA-class Nb-Ti cable-in-conduit conductor for the low field winding-package of CFETR-TF coil
/ Dai, Chao (Hefei, Inst. Plasma Phys.) ; Wu, Yu (Hefei, Inst. Plasma Phys.) ; Sedlak, Kamil (LPHE, Lausanne) ; Bajas, Hugo (LPHE, Lausanne) ; Nijhuis, Arend (Twente U., Enschede) ; Bruzzone, Pierluigi (LPHE, Lausanne) ; Devred, Arnaud (CERN) ; Qin, Jinggang (Hefei, Inst. Plasma Phys.) ; Liu, Yunhao (Hefei, CUST) ; Xue, Tianjun (Showa Wire Cable, Kawasaki) et al.
The engineering design of the CFETR TF prototype coil and conductors has been completed. The wind-package (WP) of the coil is graded into three regions based on the magnetic field distribution for saving cost. [...]
2023 - 8 p.
- Published in : Physica C 606 (2023) 1354212
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2.
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Flux Concentrator Optimization for Future Positron Sources
/ Bajas, H (CERN) ; Doebert, S (CERN) ; Latina, A (CERN) ; Zhao, Y (CERN)
Future lepton colliders, such as CLIC, FCC-ee or ILC require high quality positron sources. Positrons are created after the collision of electrons on a tungsten target and then focused to match the aperture of the capture structures with a flux concentrator (FC) often called an Adiabatic Matching Device (AMD), a strong pulsed magnet. [...]
2022 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 32 (2022) 0601105
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.0601105
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3.
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Performance of the Cable-in-Conduit Conductors for Super-X Test Facility
/ Dai, Chao (Hefei, Inst. Plasma Phys.) ; Wu, Yu (Hefei, Inst. Plasma Phys.) ; Shi, Yi (Hefei, Inst. Plasma Phys.) ; Sedlak, Kamil (Ecole Polytechnique, Lausanne) ; Bajas, Hugo (Ecole Polytechnique, Lausanne) ; Nijuis, Arend (Twente U., Enschede) ; Hao, Qiangwang (Hefei, Inst. Plasma Phys.) ; Han, Houxiang (Hefei, Inst. Plasma Phys.) ; Liu, YunHao (USTC, Hefei) ; Devred, Arnaud (CERN) et al.
Following the conceptual design, the engineering design of the dc magnet and cable-in-conduit conductor (CICC) for the Super-X test facility has been done in 2021. Totally three types of conductors with different structures were designed for the three pairs of coils in the dc magnet, respectively. [...]
2023 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 33 (2023) 9500105
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4.
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5.
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A New Electron Cooler for the CERN Antiproton Decelerator (AD)
/ Tranquille, G (CERN) ; Cenede, J (CERN) ; Frassier, A (CERN) ; Chritin, N S (CERN) ; Coutron, Y M (CERN) ; Sinturel, A (CERN) ; Ferreira, J A (CERN) ; von Freeden, L (CERN) ; Bajas, H (CERN) ; Jorgensen, L V (CERN)
The current electron cooler at the Antiproton Decelerator (AD) at CERN was built in the second half of the 1970s and is thus well over 40 years old. It was built for the Initial Cooling Experiment (ICE) where stochastic and electron cooling were tested to ascertain the feasibility of using these techniques to generate high intensity antiproton beams for the SPpS. [...]
2021 - 3 p.
- Published in : 10.18429/JACoW-COOL2021-P2004
Fulltext: PDF;
In : International Workshop on Beam Cooling and Related Topics (COOL 2021), Novosibirsk, Russian Federation, 1 - 5 Nov 2021, pp.95-97
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6.
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The Characterization of Optical Fibers for Distributed Cryogenic Temperature Monitoring
/ Marcon, Leonardo (CERN ; U. Padua (main)) ; Chiuchiolo, Antonella (Darmstadt, GSI) ; Castaldo, Bernardo (CERN) ; Bajas, Hugues (CERN) ; Galtarossa, Andrea (U. Padua (main)) ; Bajko, Marta (CERN) ; Palmieri, Luca (U. Padua (main))
Thanks to their characteristics, optical fiber sensors are an ideal solution for sensing applications at cryogenic temperatures, such as the monitoring of superconducting devices. Their applicability at such temperatures, however, is not immediate as optical fibers exhibit a non-linear thermal response which becomes rapidly negligible below 50 K. [...]
2022 - 13 p.
- Published in : Sensors 22 (2022) 4009
Fulltext: PDF;
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7.
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Optimisation of the CLIC Positron Source
/ Zhao, Yongke (Shandong U. ; CERN) ; Bajas, Hugues (CERN) ; Döbert, Steffen (CERN) ; Latina, Andrea (CERN) ; Ma, Lianliang (Shandong U.)
In this report, we reoptimised the CLIC positron source at all collision energy stages. Simulation, optimisation algorithm and results were all improved compared with previous studies. [...]
2021 - 4 p.
- Published in : 10.18429/JACoW-IPAC2021-WEPAB014
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, Br, 24 - 28 May 2021, pp.2613-2616
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Mechanical Validation of the Support Structure of the Magnet FRESCA2
/ Muñoz Garcia, J E (CERN) ; Bajas, H (CERN) ; Bajko, M (CERN) ; Charrondière, M (CERN) ; Datskov, V I (CERN) ; Durante, M (Paris, CEA) ; Ferracin, P (CERN) ; Guinchard, M (CERN) ; Manil, P (Paris, CEA) ; Perez, J C (CERN) et al.
FRESCA2 is a dipole magnet dedicated to upgrade the present CERN cable test station FRESCA to a nominal bore field of 13 Tesla (T) in a 100 mm clear aperture. This paper reports on the assembly process and the three cool-down tests to cryogenic temperature of the support structure of FRESCA2. [...]
IEEE, 2015 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 25 (2015) 4101105
In : Applied Superconductivity Conference 2014, Charlotte, NC, USA, 10 - 15 Aug 2014, pp.4101105
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A methodology for the analysis of the three-dimensional mechanical behavior of a Nb$_3$Sn superconducting accelerator magnet during a quench
/ Ferradas Troitino, J (CERN ; Geneva U.) ; Bajas, H (CERN) ; Bianchi, L (CERN) ; Castaldo, B (CERN) ; Ferracin, P (LBNL, Berkeley) ; Guinchard, M (CERN) ; Izquierdo, S (CERN) ; Lorenzo, J V (Barcelona Supercomputing Ctr.) ; Mangiarotti, F (CERN) ; Perez, J C (CERN) et al.
The fast thermal and electromagnetic transients that occur in a superconducting magnet in case of a quench have the potential of generating large mechanical stresses both in the superconducting coils and in the magnet structure. While the investigation of such quench loads should generally be conducted to ensure a safe operation of the system, its importance is greatly enlarged in the case of high-field magnets based on strain sensitive superconductors. [...]
2021 - 17 p.
- Published in : Supercond. Sci. Technol. 34 (2021) 084003
Fulltext: PDF;
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10.
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Quench Protection Studies for the High Luminosity LHC Nb$_3$Sn Quadrupole Magnets
/ Ravaioli, Emmanuele (CERN) ; Ambrosio, Giorgio (Fermilab) ; Bajas, Hugues (CERN) ; Duda, Michal (PSI, Villigen ; CERN) ; Ferracin, Paolo (LBNL, Berkeley) ; Ferradas Troitino, Jose (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Mangiarotti, Franco (CERN) ; Marinozzi, Vittorio (Fermilab) ; Mentink, Matthias (CERN) et al.
Achieving the targets of the High Luminosity LHC project requires the installation of new inner triplet magnet circuits for the final focusing of the particle beams on each side of the two main interaction points. Each of the four circuits will include six 150 mm aperture, 132.2 T/m gradient, Nb$_3$Sn quadrupole magnets to be installed in the LHC tunnel. [...]
FERMILAB-PUB-21-124-TD.-
2021 - 5 p.
- Published in : IEEE Trans. Appl. Supercond. 31 (2021) 4700405
Fulltext from Publisher: PDF;
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