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NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septum

A passive superconducting shield was proposed earlier to realize a high-field (3-4 T) septum magnet for the Future Circular Collider. This paper presents the experimental results of a potential shield material, a NbTi/Nb/Cu multilayer sheet. A cylindrical shield was constructed from two halves, each...

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Detalles Bibliográficos
Autores principales: Barna, D., Novák, M., Brunner, K., Petrone, C., Atanasov, M., Feuvrier, J., Pascal, M.
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:https://dx.doi.org/10.1109/TASC.2018.2872860
http://cds.cern.ch/record/2643543
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author Barna, D.
Novák, M.
Brunner, K.
Petrone, C.
Atanasov, M.
Feuvrier, J.
Pascal, M.
author_facet Barna, D.
Novák, M.
Brunner, K.
Petrone, C.
Atanasov, M.
Feuvrier, J.
Pascal, M.
author_sort Barna, D.
collection CERN
description A passive superconducting shield was proposed earlier to realize a high-field (3-4 T) septum magnet for the Future Circular Collider. This paper presents the experimental results of a potential shield material, a NbTi/Nb/Cu multilayer sheet. A cylindrical shield was constructed from two halves, each consisting of 4 layers with a total thickness of 3.2~mm, and inserted into the bore of a spare LHC dipole corrector magnet (MCBY). At 4.2~K, up to about 3.1~T at the shield's surface only a leakage field of 12.5~mT was measured inside the shield. This can be attributed to the mis-alignment of the two half cylinders, as confirmed by finite element simulations. With a better configuration we estimate the shield's attenuation to be better than $\mathbf{4\times 10^{-5}}$, acceptable for the intended application. Above 3.1~T the field penetrated smoothly. Below that limit no flux jumps were observed even at the highest achievable ramp rate of more than 50~mT/s at the shield's surface. A 'degaussing' cycle was used to eliminate the effects of the field trapped in the thick wall of the shield, which could otherwise distort the homogeneous field pattern at the extracted beam's position. At 1.9~K the shield's performance was superior to that at 4.2~K, but it suffered from flux jumps.
id cern-2643543
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
record_format invenio
spelling cern-26435432019-09-30T06:29:59Zdoi:10.1109/TASC.2018.2872860http://cds.cern.ch/record/2643543engBarna, D.Novák, M.Brunner, K.Petrone, C.Atanasov, M.Feuvrier, J.Pascal, M.NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septumphysics.acc-phAccelerators and Storage RingsA passive superconducting shield was proposed earlier to realize a high-field (3-4 T) septum magnet for the Future Circular Collider. This paper presents the experimental results of a potential shield material, a NbTi/Nb/Cu multilayer sheet. A cylindrical shield was constructed from two halves, each consisting of 4 layers with a total thickness of 3.2~mm, and inserted into the bore of a spare LHC dipole corrector magnet (MCBY). At 4.2~K, up to about 3.1~T at the shield's surface only a leakage field of 12.5~mT was measured inside the shield. This can be attributed to the mis-alignment of the two half cylinders, as confirmed by finite element simulations. With a better configuration we estimate the shield's attenuation to be better than $\mathbf{4\times 10^{-5}}$, acceptable for the intended application. Above 3.1~T the field penetrated smoothly. Below that limit no flux jumps were observed even at the highest achievable ramp rate of more than 50~mT/s at the shield's surface. A 'degaussing' cycle was used to eliminate the effects of the field trapped in the thick wall of the shield, which could otherwise distort the homogeneous field pattern at the extracted beam's position. At 1.9~K the shield's performance was superior to that at 4.2~K, but it suffered from flux jumps.A passive superconducting shield was proposed earlier to realize a high-field (3-4 T) septum magnet for the Future Circular Collider. This paper presents the experimental results of a potential shield material, an NbTi/Nb/Cu multilayer sheet. A cylindrical shield was constructed from two halves, each consisting of four layers with a total thickness of 3.2 mm, and inserted into the bore of a spare dipole corrector magnet of the Large Hadron Collider. At 4.2 K, up to about 3.1 T at the shield's surface, only a leakage field of 12.5 mT was measured inside the shield. This can be attributed to the misalignment of the two half cylinders, as confirmed by finite element simulations. With a better configuration, we estimate the shield's attenuation to be better than 4 × 10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-5</sup>, which is acceptable for the intended application. Above 3.1 T, the field penetrated smoothly. Below that limit, no flux jumps were observed even at the highest achievable ramp rate of more than 50 mT/s at the shield's surface. A “degaussing” cycle was used to eliminate the effects of the field trapped in the thick wall of the shield, which could otherwise distort the homogeneous field pattern at the extracted beam's position. At 1.9 K, the shield's performance was superior to that at 4.2 K, but it suffered from flux jumps.arXiv:1809.04330oai:cds.cern.ch:26435432018-09-12
spellingShingle physics.acc-ph
Accelerators and Storage Rings
Barna, D.
Novák, M.
Brunner, K.
Petrone, C.
Atanasov, M.
Feuvrier, J.
Pascal, M.
NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septum
title NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septum
title_full NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septum
title_fullStr NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septum
title_full_unstemmed NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septum
title_short NbTi/Nb/Cu multilayer shield for the superconducting shield (SuShi) septum
title_sort nbti/nb/cu multilayer shield for the superconducting shield (sushi) septum
topic physics.acc-ph
Accelerators and Storage Rings
url https://dx.doi.org/10.1109/TASC.2018.2872860
http://cds.cern.ch/record/2643543
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