Alternating magnetic field losses in ATLAS type aluminum stabilized NbTi superconductors

E.W. Boxman; A. Nijhuis; H.H.J. ten Kate

doi:10.1063/1.1472631

Alternating magnetic field losses in ATLAS type aluminum stabilized NbTi superconductors

E.W. Boxman, A. Nijhuis, H.H.J. ten Kate

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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Abstract

During ramping up- and down of the current in large-scale magnets the ramp losses are an important factor affecting the thermal and electro-magnetic stability of the system. The calculation of the losses is not straightforward due to the large dimensions of the conductor (∼600 mm2) implying that diffusion effects have to be taken into account. The AC-losses of the Al stabilized NbTi cable conductors used in the ATLAS magnet system were measured in 0.5 m long samples, using an inductive method with pick-up coils as well as the calorimetric method. External varying magnetic fields up to 2 tesla amplitude were applied parallel and perpendicular to the conductor wide surface. The results are compared to theory. It is found that hysteresis loss, eddy current loss in the Aluminum cladding and cable-to-cladding coupling loss contribute most to the AC loss.

Original language	English
Title of host publication	Proceedings of the International Cryogenic Materials Conference, ICMC, Madison, Wisconsin, USA, 16-20 July, 2001
Editors	U. (Balu) Balachandran, Donald Gubser, K. Ted Hartwig, Melinda Adams
Publisher	American Institute of Physics
Pages	906-913
Number of pages	8
ISBN (Print)	0-7354-0060-1
DOIs	https://doi.org/10.1063/1.1472631
Publication status	Published - 2002
Event	2001 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 2001 - Madison, United States Duration: 16 Jul 2001 → 20 Jul 2001

Publication series

Name	Advances in cryogenic engineering
Publisher	AIP
Volume	48
ISSN (Print)	0065-2482

Name	AIP Conference Proceedings
Publisher	AIP
Volume	614

Conference

Conference	2001 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 2001
Abbreviated title	CEC/ICMC
Country	United States
City	Madison
Period	16/07/01 → 20/07/01

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10.1063/1.1472631

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Boxman, E. W., Nijhuis, A., & ten Kate, H. H. J. (2002). Alternating magnetic field losses in ATLAS type aluminum stabilized NbTi superconductors. In U. B. Balachandran, D. Gubser, K. T. Hartwig, & M. Adams (Eds.), Proceedings of the International Cryogenic Materials Conference, ICMC, Madison, Wisconsin, USA, 16-20 July, 2001 (pp. 906-913). (Advances in cryogenic engineering; Vol. 48), (AIP Conference Proceedings; Vol. 614). American Institute of Physics. https://doi.org/10.1063/1.1472631

Boxman, E.W. ; Nijhuis, A. ; ten Kate, H.H.J. / Alternating magnetic field losses in ATLAS type aluminum stabilized NbTi superconductors. Proceedings of the International Cryogenic Materials Conference, ICMC, Madison, Wisconsin, USA, 16-20 July, 2001. editor / U. (Balu) Balachandran ; Donald Gubser ; K. Ted Hartwig ; Melinda Adams. American Institute of Physics, 2002. pp. 906-913 (Advances in cryogenic engineering). (AIP Conference Proceedings).

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abstract = "During ramping up- and down of the current in large-scale magnets the ramp losses are an important factor affecting the thermal and electro-magnetic stability of the system. The calculation of the losses is not straightforward due to the large dimensions of the conductor (∼600 mm2) implying that diffusion effects have to be taken into account. The AC-losses of the Al stabilized NbTi cable conductors used in the ATLAS magnet system were measured in 0.5 m long samples, using an inductive method with pick-up coils as well as the calorimetric method. External varying magnetic fields up to 2 tesla amplitude were applied parallel and perpendicular to the conductor wide surface. The results are compared to theory. It is found that hysteresis loss, eddy current loss in the Aluminum cladding and cable-to-cladding coupling loss contribute most to the AC loss.",

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Boxman, EW, Nijhuis, A & ten Kate, HHJ 2002, Alternating magnetic field losses in ATLAS type aluminum stabilized NbTi superconductors. in UB Balachandran, D Gubser, KT Hartwig & M Adams (eds), Proceedings of the International Cryogenic Materials Conference, ICMC, Madison, Wisconsin, USA, 16-20 July, 2001. Advances in cryogenic engineering, vol. 48, AIP Conference Proceedings, vol. 614, American Institute of Physics, pp. 906-913, 2001 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 2001, Madison, United States, 16/07/01. https://doi.org/10.1063/1.1472631

Alternating magnetic field losses in ATLAS type aluminum stabilized NbTi superconductors. / Boxman, E.W.; Nijhuis, A.; ten Kate, H.H.J.

Proceedings of the International Cryogenic Materials Conference, ICMC, Madison, Wisconsin, USA, 16-20 July, 2001. ed. / U. (Balu) Balachandran; Donald Gubser; K. Ted Hartwig; Melinda Adams. American Institute of Physics, 2002. p. 906-913 (Advances in cryogenic engineering; Vol. 48), (AIP Conference Proceedings; Vol. 614).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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AB - During ramping up- and down of the current in large-scale magnets the ramp losses are an important factor affecting the thermal and electro-magnetic stability of the system. The calculation of the losses is not straightforward due to the large dimensions of the conductor (∼600 mm2) implying that diffusion effects have to be taken into account. The AC-losses of the Al stabilized NbTi cable conductors used in the ATLAS magnet system were measured in 0.5 m long samples, using an inductive method with pick-up coils as well as the calorimetric method. External varying magnetic fields up to 2 tesla amplitude were applied parallel and perpendicular to the conductor wide surface. The results are compared to theory. It is found that hysteresis loss, eddy current loss in the Aluminum cladding and cable-to-cladding coupling loss contribute most to the AC loss.

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Boxman EW, Nijhuis A , ten Kate HHJ. Alternating magnetic field losses in ATLAS type aluminum stabilized NbTi superconductors. In Balachandran UB, Gubser D, Hartwig KT, Adams M, editors, Proceedings of the International Cryogenic Materials Conference, ICMC, Madison, Wisconsin, USA, 16-20 July, 2001. American Institute of Physics. 2002. p. 906-913. (Advances in cryogenic engineering). (AIP Conference Proceedings). https://doi.org/10.1063/1.1472631