Abstract
Superconductors for fusion are subjected to fast variations of magnetic fields. The effective diameter of the strands is of great importance to limit the level of losses appearing during theses variations. Another less controlled characteristic also plays a major role: the conductor time constant. A model is given to calculate this time constant. The void fraction, the twist pitches associated to the different stages, the chromium coating and the internal resistive barriers inside the strand influence greatly this time constant. The influence of the different parameters is discussed through practical considerations depending on the kind of cable considered. This model is applied to measurements performed at the University of Twente and at CEA on Nb3Sn subcables made of twisted strands relevant for ITER. The application of this model is also discussed for a typical NbTi strand for fusion application developed by GEC AISA. As a matter of fact, the NbTi is again present in the ITER design for most of the poloidal field coils, which represents hundreds tons of material.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
ITER report Appendix A Conductor design April 1995.
D. Ciazynski, Approximate calculation of losses in a twisted cable made of superconducting composites. Internal CEA report DRFC/TS 41.85.06
C Meuris AC loss tests on full size superconducting cables Intermediate report: test of J-1, J-2 and J-3 samples. December 15, 1994 Internal report STEP 304 TC8.
P. Bruzzone and al Coupling current losses bench mark test of ITER subsize conductor. Conference on Magnet technology MT 24 Tempere Finland June 1995 to be published.
A. Nijhuis and al Parametric study on coupling loss in Subsize NET/ITER Nb3Sn cabled specimen. Conference on magnet technology MT 24 Tempere Finland June 1995 To be published. Boston 1994.
T. A Painter and al. Test Data From the US Demonstration poloidal coil experiment. PFC/RR-92-1
Bruzzek Private Communication.
S.F Cogan, R. M. Rose Properties of CuSn Bronze at 4.2 K Cryogenics, June 1980, p. 313.
J.L Duchateau and P. Hertout Final report on NET Contract CNET 93–308. Assessment of the use of NbTi in the ITER coils.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1996 Plenum Press, New York
About this chapter
Cite this chapter
Duchateau, J.L., Ciazynski, D., Martinez, A., Schild, T., Navatel, R., ten Kate, H. (1996). Coupling Losses of Fusion Conductors: Influence of Some Design Parameters. In: Kittel, P. (eds) Advances in Cryogenic Engineering. A Cryogenic Engineering Conference Publication, vol 41. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0373-2_69
Download citation
DOI: https://doi.org/10.1007/978-1-4613-0373-2_69
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-8022-1
Online ISBN: 978-1-4613-0373-2
eBook Packages: Springer Book Archive