Heat generation by eddy currents in a shell of superconducting bus-bars for SIS100 particle accelerator at FAIR

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Abstract

Superconducting magnets in the SIS100 particle accelerator require the supply of liquid helium and electric current. Both are transported with by-pass lines designed at Wrocław University of Technology. Bus-bars used to transfer an electric current between the sections of the accelerator will be encased in a steel shell. Eddy currents are expected to appear in the shell during fast-ramp operation of magnets. Heat generation, which should be limited in any cryogenic system, will appear in the shell. In this work the amount of heat generated is assessed depending on the geometry of an assembly of the bus-bars and the shell. Numerical and analytical calculations are described. It was found that heat generation in the shell is relatively small when compared to other sources present in the accelerator and its value strongly depends on the geometry of the shell. The distribution of eddy currents and generated heat for different geometrical options are presented. Based on the results of the calculations the optimal design is proposed.

[1] FAIR collaboration, FAIR Baseline Technical Report, March 2006, vol. 1 (2006).

[2] Eisel T., Chorowski M., Iluk A. et al., Local Cryogenics for the SIS100 at FAIR, IOP Conference Series: Materials Science and Engineering, vol. 101, no. May 2016, p. 012075 (2015).

[3] Acker D., Bleile A., Fischer E. et al., Development of FAIR superconducting magnets and cryogenic system, GSI Scientific Report, no. 506065, pp. 118-119 (2010).

[4] Khodzhibagiyan H., Drobin V., Fischer E. et al., Design and study of new cables for superconducting accelerator magnets: Synchrotron SIS 100 at GSI and NICA collider at JINR, Journal of Physics: Conference Series, vol. 234, p. 022017 (2010).

[5] Raach H., Schroeder C., Floch E. et al., 14 kA HTS current leads with one 4.8 K helium stream for the prototype test facility at GSI, Physics Procedia, vol. 67, pp. 10981101 (2015).

[6] Xiang Y., Kauschke M., Schroeder C., Kollmus H., Cryogenics for super-FRS at FAIR, Physics Procedia, vol. 67, pp. 847852 (2015).

[7] Kauschke M., Xiang Y., Schroeder C. et al., Cryogenic Supply for Accelerators and Experiments at FAIR, AIP Conference Proceedings, vol. 1200, no. 2014 (2014).

[8] Bleile A., Fischer E., Freisleben W. et al., Thermodynamic properties of the superconducting dipole magnet of the SIS100 synchrotron, Physics Procedia, vol. 67, pp. 781784 (2015).

[9] Fischer E., Kurnyshov R., Shcherbakov P., Analysis of coupled electromagnetic-thermal effects in superconducting accelerator magnets, Journal of Physics: Conference Series, vol. 97, p. 012261 (2008).

[10] Stafiniak A., Floch E., Schroeder C. et al., The GSI Cryogenic Prototype Test Facility - First Experience Gained on 2-Phase-Flow Superconducting Prototype Magnets of the FAIR Project, IEEE Transactions on Applied Superconductivity, vol. 19, no. 3, pp. 11501153 (2009).

[11] Fischer E., Mierau A., Schnizer P. et al., Thermodynamic Properties of Fast Ramped Superconducting Accelerator Magnets for the Fair Project, AIP Conference Proceedings, vol. 552, no. 2004, pp. 989996 (2010).

[12] Fischer E., Schnizer P., Mierau A. et al., Status of the Superconducting Magnets for FAIR, GSI Scientific Report, vol. 24, no. 3, pp. 474475 (2014).

[13] Ageev A., Kozub S., Zintchenko S., Zubko V., Cooling System of the SIS300 Accelerator Heat Load of SIS300 Cryogenic System, Proceedings of RuPAC-2010, pp. 303-305 (2010).

[14] Fischer E., Schnizer P., Mierau A. et al., Design and Test Status of the Fast Ramped Superconducting SIS100 Dipole Magnet for FAIR, IEEE Transactions on Applied Superconductivity, vol. 21, no. 3, pp. 1844-1848 (2011).

[15] Bleile A., Fischer E., Khodzhibagiyan H. et al., Investigation of the cooling conditions for the Fast Ramped Superconducting Magnets of the SIS100 Synchrotron, Journal of Physics: Conference Series, vol. 507, no. 3, p. 032007 (2014).

[16] Rong J., Huang X., AC Loss of ITER Feeder Busbar in 15MA Plasma Current Reference Scenario, Journal of Fusion Energy, vol. 35, no. 2, pp. 173-179 (2016).

[17] Fischer E., Kurnyshov R., Shcherbakov P., Analysis of the Eddy Current Relaxation Time Effects in the FAIR SIS 100 Main Magnets, IEEE Transactions on Applied Superconductivity, vol. 17, no. 2, pp. 11731176 (2007).

[18] Stafiniak A., Szwangruber P., Freisleben W., Floch E., Electrical integrity and its protection for reliable operation of superconducting machines, Physics Procedia, vol. 67, pp. 11061111 (2015).

[19] Schnizer P., Mierau A., Bleile A. et al., Low-temperature test capabilities for the superconducting magnets of FAIR, IEEE Transactions on Applied Superconductivity, vol. 25, no. 3 (2015).

[20] Ho C., Chu T., Electrical resistivity and thermal conductivity of nine selected AISI stainless steels, Cindas Report 45 (1977).

Archives of Electrical Engineering

The Journal of Polish Academy of Sciences

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CiteScore 2016: 0.71

SCImago Journal Rank (SJR) 2016: 0.238
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