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2019-08-20
06:49
Manufacture and Test of the ITER TF Type HTS Current Lead Prototypes / Ding, Kaizhong (Hefei, Inst. Plasma Phys.) ; Zhou, Tingzhi (Hefei, Inst. Plasma Phys.) ; Ballarino, Amalia (CERN) ; Gung, Chenyu (Southampton U.) ; Lu, Kun (Hefei, Inst. Plasma Phys.) ; Song, Yuntao (Hefei, Inst. Plasma Phys.) ; Niu, Erwu (Beihang U.) ; Bauer, Pierre (BIAM, St Paul lez Durance) ; Devred, Arnaud (BIAM, St Paul lez Durance) ; Lee, Seungje (BIAM, St Paul lez Durance) et al.
High temperature superconducting current leads (HTS-CL) are designed to supply the current to the large superconducting ITER magnets for the operation with reduced heat load to the cryogenic system. The Toroidal field (TF) current leads are the largest with a current capacity of 68 kA each. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4802605

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2019-08-20
06:49
How to Computationally Determine the Maximum Stable Operation Current of an HTS Magnet / Ruuskanen, Janne (Tampere U. of Tech.) ; Stenvall, Antti (Tampere U. of Tech.) ; Lahtinen, Valtteri (Tampere U. of Tech.) ; van Nugteren, Jeroen (CERN) ; Kirby, Glyn (CERN) ; Murtomäki, Jaakko (Tampere U. of Tech.)
The short-sample critical current is only an indicative property for the maximum current a magnet can be continuously operated with. This was especially visible in the experiments of one of the world's first Roebel-cable-based high temperature superconductors dipole magnet prototype built and tested at CERN in 2017 where the thermal runaway developed very slowly in many cases. [...]
2019 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4701204 fulltext from publisher: PDF;

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2019-08-20
06:49
The Effect of Specific Manufacturing Characteristics on PF ITER Full-Size Joint Performance / Pison, Pilar Fernandez (Carlos III U., Madrid) ; Langeslag, Stefanie A E (CERN) ; Santillana, Ignacio Aviles (CERN) ; Dimitrijevic, Alexander (CERN) ; Sgobba, Stefano (CERN) ; Ilyin, Yury (BIAM, St Paul lez Durance) ; Simon, Fabrice (BIAM, St Paul lez Durance) ; Lim, Byung Su (BIAM, St Paul lez Durance)
The development of new generation superconducting magnets for fusion research, such as the ITER experiment, is largely based on coils wound from so-called “Cable-In-Conduit” Conductors (CICCs). CICCs consist of various types of stainless steel jackets, densely filled with compacted superconducting strands, which are cooled by supercritical helium. [...]
2019 - 6 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 4200706 fulltext from publisher: PDF;

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2019-08-20
06:49
Purification of Selective Laser Melting Additive Manufactured Niobium for Superconducting RF-Applications Transactions on Applied Superconductivity / Motschmann, Fritz (CERN) ; Gerard, Romain (CERN) ; Gilles, Favre (CERN)
Superconducting radio frequency (SRF)-cavities in the field of particle accelerators are mostly manufactured from bulk or sheet niobium (Nb). Complex shapes of SRF-components like high order mode-couplers or cavities working at high fields are high in cost and lead-time. [...]
2019 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 29 (2019) 3500805

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2019-08-20
06:49
Direct measurement of Nb$_{3}$Sn filament loading strain and stress in accelerator magnet coil segments / Scheuerlein, C (CERN) ; Wolf, F (CERN) ; Lorentzon, M (CERN) ; Hofmann, M (Forschungsreaktor Munich)
We have directly measured, for the first time, the Nb3Sn and Cu loading strains and stresses in 11 T dipole coil segments upon compressive loading using neutron diffraction. For this purpose a load frame that enables rotation of the sample load axis with respect to the neutron scattering geometry was installed in the Stress-Spec beamline at the Heinz Maier-Leibnitz FRM II neutron source. [...]
2019 - 8 p. - Published in : Supercond. Sci. Technol. 32 (2019) 045011 Fulltext from publisher: PDF;

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2019-08-20
06:49
Focusing of 180 GeV/c pions from a point-like source into a parallel beam by a bent silicon crystal / Scandale, W (CERN) ; Arduini, G (CERN) ; Cerutti, F (CERN) ; Garattini, M (CERN ; Imperial Coll., London) ; Gilardoni, S (CERN) ; Lechner, A (CERN) ; Losito, R (CERN) ; Masi, A (CERN) ; Mirarchi, D (CERN) ; Montesano, S (CERN) et al.
At large accelerators, bent crystals are employed to deflect weakly divergent proton beams at the stages of extraction and collimation. We demonstrate that a divergent particle beam may be efficiently deflected using a crystal with a focusing entry face. [...]
2019 - 4 p. - Published in : Nucl. Instrum. Methods Phys. Res., B 446 (2019) 15-18

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2019-08-20
06:49
First experimental demonstration of forced dynamic aperture measurements with LHC ac dipoles / Carlier, F S (Nikhef, Amsterdam ; CERN) ; Tomás, R (CERN) ; Maclean, E H (CERN) ; Persson, T H B (CERN)
Diagnostics of nonlinear beam dynamics has become more important for the LHC as it advances into increasingly challenging regimes of operation, as well as for the High Luminosity LHC where machine nonlinearities will have a significantly larger impact. Limitations of traditional excitation methods at top energy, in particular due to machine protection, have pushed the development of safe alternative methods using ac dipoles to characterize the nonlinear content of the LHC. [...]
2019 - 13 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 031002 Fulltext from Publisher: PDF;

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2019-08-20
06:49
Innovative method to measure the extent of the stable phase-space region of proton synchrotrons / Maclean, E H (Malta U. ; CERN) ; Giovannozzi, M (CERN) ; Appleby, R B (Manchester U.)
The advent of circular accelerators based on superconducting magnets has revolutionized the field of beam dynamics, with particle motion turning from linear to nonlinear due to unavoidable high-order field errors generated by the ring magnets. Nonlinear dynamics was already well mastered, e.g., in the close field of celestial mechanics as similar problems had been considered and successfully tackled. [...]
2019 - 8 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 034002 Fulltext from Publisher: PDF;

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2019-08-17
09:04
User defined elements in ANSYS for 2D multiphysics modeling of superconducting magnets / Brouwer, Lucas (LBNL, Berkeley) ; Arbelaez, Diego (LBNL, Berkeley) ; Auchmann, Bernhard (PSI, Villigen ; CERN) ; Bortot, Lorenzo (CERN) ; Stubberud, Edvard (CERN)
Dynamic simulation of superconducting magnets is critical for the design of quench protection systems to prevent potentially damaging temperatures and high voltage from developing after magnet quench. Modeling these scenarios is challenging due to the many multiscale phenomena which impact magnet behavior. [...]
2019 - 12 p. - Published in : Supercond. Sci. Technol. 32 (2019) 095011

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2019-08-17
09:04
Modelling thermodynamics in a high-temperature superconducting dipole magnet: an inverse problem based approach / Ruuskanen, J (Tampere U. of Tech.) ; Stenvall, A (Tampere U. of Tech.) ; Lahtinen, V (Tampere U. of Tech.) ; van Nugteren, J (CERN) ; Kirby, G (CERN) ; Murtomäki, J (Tampere U. of Tech.)
The use of practical high temperature superconductors (HTS), REBCO tapes especially, in magnet applications has become possible thanks to the increasing interest of manufacturers. One difficulty has been the nonlinear material properties that are challenging to measure and model. [...]
2019 - 11 p. - Published in : Supercond. Sci. Technol. 32 (2019) 094007

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