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1.
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Analysis of inhomogeneities in Nb$_{3}$Sn wires by combined SEM and SHPM and their impact on J $_{c}$ and T $_{c}$
/ Pfeiffer, S (Vienna, Tech. U. ; CERN) ; Baumgartner, T (Vienna, Tech. U., Atominst.) ; Löffler, S (Vienna, Tech. U.) ; Stöger-Pollach, M (Vienna, Tech. U.) ; Hopkins, S C (CERN) ; Ballarino, A (CERN) ; Eisterer, M (Vienna, Tech. U., Atominst.) ; Bernardi, J (Vienna, Tech. U.)
Abstract
We demonstrate the combined use of scanning electron microscopy (SEM) and scanning Hall probe microscopy (SHPM) to analyse inhomogeneities in Nb3Sn wires. Inhomogeneities of the A15 phase in Nb3Sn sub-elements of a Ti-alloyed Restacked Rod Process wire and a Ta-alloyed Powder-In-Tube wire are investigated. [...]
2023 - 11 p.
- Published in : Supercond. Sci. Technol. 36 (2023) 045008
Fulltext: PDF;
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2.
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3.
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Cherenkov Diffraction Radiation Emissions from Single Electrons and Positrons on a Fused Silica Radiator
/ Estevez, Silas Ruhrberg (Unlisted, DE) ; Baumgartner, Tobias (Unlisted, DE) ; Bahl, Johann (Unlisted, DE) ; Lehrach, Thomas (Unlisted, DE) ; Thole, Tobias (Unlisted, DE) ; Nickel, Benildur (Unlisted, DE) ; Loewe, Philipp (Unlisted, DE) ; Hildebrandt, Lukas (Unlisted, DE) ; da Cruz E Silva, Cristóvão Beirão (CERN) ; Schütze, Paul (DESY) et al.
Beam diagnostics are crucial for smooth accelerator operations. Many techniques rely on instrumentation in which the beam properties are significantly affected by the measurement. [...]
arXiv:2209.10937.-
2023-04-11 - 8 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1052 (2023) 168287
Fulltext: 2209.10937 - PDF; Publication - PDF;
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4.
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Behind the Scenes: The Two-Weeks Stay of Beamline for Schools Winning Students at DESY
/ Arce-Larreta, Enrique (Unlisted, US, UT) ; Aretz, Sarah (DESY) ; Baumgartner, Tobias (Unlisted, DE) ; Beirão da Cruz e Silva, Cristóvão (CERN) ; Bonkowsky, Charles Frederick (Unlisted, US, UT) ; Bonkowsky, Samuel Blaschke (Unlisted, US, UT) ; Boselli, Margherita (CERN) ; de Bruine, Frederiek (Unlisted, NL) ; de Goede, Ilja (Unlisted, NL) ; Joos, Markus (CERN) et al.
In a previous paper the BL4S science competition has been presented from the technical point of view. This paper focuses on the organizational aspects of the period that the winning teams spent at DESY to perform their experiments. [...]
2021 - 9 p.
- Published in : The Physics Educator 03 (2021) 2150001
Fulltext: PDF;
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5.
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Influence of transverse stress exerted at room temperature on the superconducting properties of Nb$_3$Sn wires
/ Ebermann, P (CERN ; Vienna, Tech. U., Atominst.) ; Baumgartner, T (Vienna, Tech. U., Atominst.) ; Behnsen, J (U. Manchester (main)) ; Daly, M (CERN) ; Terricabras, A Gallifa (CERN) ; Koettig, T (CERN) ; Lackner, F (CERN) ; Scheuerlein, C (CERN) ; Eisterer, M (Vienna, Tech. U., Atominst.)
Results on the irreversible degradation of Rutherford cables caused by transverse stress applied at room temperature have been recently published in the frame of the Future Circular Collider study for the 16 T dipole development programme. In order to investigate the degradation process of Nb3Sn composite superconductors, experiments based on wires of the same type as used in the cable have been launched. [...]
2019 - 18 p.
- Published in : Supercond. Sci. Technol. 32 (2019) 095010
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6.
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The CERN FCC Conductor Development Program: A Worldwide Effort for the Future Generation of High Field Magnets
/ Ballarino, Amalia (CERN) ; Hopkins, Simon (CERN) ; Bordini, Bernardo (CERN) ; Richter, David (CERN) ; Tommasini, Davide (CERN) ; Bottura, Luca (CERN) ; Benedikt, Michael (CERN) ; Sugano, Michinaka ; Ogitsu, Toru ; Kawashima, Shinya (Kobe Steel) et al.
The study of next-generation high-energy accelerators based on 16 T dipoles has emphasized the need for higher performance, cost-effective Nb$_3$Sn superconducting wires. A Conductor Development Program aiming to reach a non-copper critical current density ($J_c$) of 1500 A/mm2 at 16 T and 4.2 K has been launched by CERN, with the involvement of industry and laboratories worldwide. [...]
CERN-ACC-2019-0001.-
Geneva : CERN, 2019 - 9 p.
- Published in : IEEE Trans. Appl. Supercond. 29 (2019) 6000709
Fulltext: PDF;
In : Applied Superconductivity Conference 2018, Seattle, United States Of America, 28 Oct - 2 Nov 2018, pp.6000709
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7.
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Effects of inhomogeneities on pinning force scaling in Nb$_3$Sn wires
/ Baumgartner, Thomas (Vienna, Tech. U., Atominst.) ; Pfeiffer, S (Vienna, Tech. U.) ; Bernardi, Johannes (Vienna, Tech. U.) ; Ballarino, A (CERN) ; Eisterer, Michael (Vienna, Tech. U., Atominst.)
We analyzed the effects of A-15 phase inhomogeneities, in particular Sn concentration gradients, on the pinning force scaling behavior of Nb3Sn wires. This was accomplished using a software code capable of simulating both magnetization and transport measurements on wires containing sub-elements with an arbitrary (e.g. [...]
2018 - 11 p.
- Published in : Supercond. Sci. Technol. 31 (2018) 084002
Fulltext: pdf - PDF; document - PDF;
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Thallium-based high-temperature superconductors for beam impedance mitigation in the Future Circular Collider
/ Calatroni, S (CERN) ; Bellingeri, E (CNR-SPIN, Naples) ; Ferdeghini, C (CNR-SPIN, Naples) ; Putti, M (CNR-SPIN, Naples ; Genoa U.) ; Vaglio, R (CNR-SPIN, Naples ; INFN, Naples ; Naples U.) ; Baumgartner, T (Vienna, Tech. U., Atominst.) ; Eisterer, M (Vienna, Tech. U., Atominst.)
CERN has recently started a design study for a possible next-generation high-energy hadron–hadron collider (Future Circular Collider—FCC-hh). The FCC-hh study calls for an unprecedented center-of-mass collision energy of 100 TeV, achievable by colliding counter-rotating proton beams with an energy of 50 TeV steered in a 100 km circumference tunnel by superconducting magnets which produce a dipole field of 16 T. [...]
2017 - 7 p.
- Published in : Supercond. Sci. Technol. 30 (2017) 075002
Fulltext: PDF;
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9.
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Effects of neutron irradiation on pinning force scaling in state-of-the-art Nb$_{3}$Sn wires
/ Baumgartner, T (Vienna, Tech. U., Atominst.) ; Eisterer, M (Vienna, Tech. U., Atominst.) ; Weber, H W (Vienna, Tech. U., Atominst.) ; Flükiger, R (CERN) ; Scheuerlein, C (CERN) ; Bottura, L (CERN)
We present an extensive irradiation study involving five state-of-the-art Nb$_{3}$Sn wires which were subjected to sequential neutron irradiation up to a fast neutron fluence of 1.6 x 10(22) m(-2) (E > 0.1 MeV). The volume pinning force of short wire samples was assessed in the temperature range from 4.2 to 15 K in applied fields of up to 7 T by means of SQUID magnetometry in the unirradiated state and after each irradiation step. [...]
2014
- Published in : Supercond. Sci. Technol. 27 (2014) 015005
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