Design and Modelling of LTS Superconducting Magnets
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1 ASC 2012 Short Course Design and Modelling of LTS Superconducting Magnets Paolo Ferracin European Organization for Nuclear Research (CERN) Arup Ghosh Brookhaven National Laboratory (BNL) Helene Felice Lawrence Berkeley National Laboratory (LBNL)
2 Introduction The course is intended for physicists and engineers working in the areas of magnet technology and applied superconductivity, and interested in basic principles, physical parameters, and analytical and numerical tools related to superconducting magnet design. The course will follow the key steps which characterize the definition of the magnetic, mechanical and thermal parameters of a superconducting magnet. The first part will deal with properties and characteristics of the superconducting strands and cables, with a description of the motivations behind their design features. The main concepts governing the magnetic design will follow, starting from the analytic description of field profiles and proceeding with an overview of different coil configurations. The mechanical aspects of superconducting magnet will then be presented, with particular emphasis on all the components used to contain the electro-magnetic forces and manage the resulting stresses. Finally, the course will deal with the quench phenomenon and with the systems designed to protect the magnet when superconductivity is lost. A case study, summarizing the main items covered by the course, will be presented and discussed in the class. Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 2
3 Course outline 8.30 am to 8.45 am (15min) Course introduction (Paolo Ferracin) 8.45 am to am (1h 30min) Superconducting strand and cable design (Arup Ghosh) 15min break am to pm (1h 15min) Magnetic design (Paolo Ferracin) Lunch break 13 pm to pm (1h) Mechanical design (Paolo Ferracin) pm to pm (1h 30min) Quench protection principles and systems (Helene Felice) 15min break pm to (45 min) Case study, conclusions and discussions (All) Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 3
4 Chapters outline Superconducting strand and cable design (Arup Ghosh) Overview of Superconductors and Applications General Principles Multi-filamentary LTS Superconductors Strand Properties for Magnet Application Multi-stranded Conductor Rutherford Cable Design Summary Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 4
5 Chapters outline Magnetic design (Paolo Ferracin) Different field shape and their function Solenoid, dipole, quadrupole How do we create a perfect field? How do we express the field and its imperfections? How do we design a coil to minimize field errors? Which is the maximum field we can get? Overview of different designs Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 5
6 Chapters outline Mechanical design (Paolo Ferracin) Electromagnetic forces and magnetic pressure Approximation of practical windings Stress and pre-stress Support structures Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 6
7 Chapters outline Quench protection principles and systems (Helene Felice) What is a quench? Definition and classification Conductor limited quenches versus energy deposited quenches Minimum Quench Energy and Minimum Propagation Zone Propagation velocity Why do we need quench protection? Hot spot temperature and MIITs Critical Parameters Detection Resistance of the system Protection methods Extraction Resistance Protection Heaters Electrical Integrity Some numerical codes Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 7
8 References The main references are Martin N. Wilson, "Superconducting Magnets", K.-H. Mess, P. Schmuser, S. Wolff, Superconducting accelerator magnets, Singapore: World Scientific, Fred M. Asner, "High Field Superconducting Magnets", Stability of Superconductors: L. Dresner, pub Plenum Press, New York, Handbook of Applied Superconductivity, ed. B. Seeber, Proc. Applied Superconductivity Conference: published as IEEE Trans. Applied Superconductivity and as IEEE Trans. Magnetics. Proc. European Conference on Applied Superconductivity EUCAS. Proc. International Conference on Magnet Technology, published as IEEE Trans. Applied Superconductivity and as IEEE Trans. Magnetics. P. Ferracin, E. Todesco, S. Prestemon, H. Felice, Superconducting accelerator magnets course at the US Particle Accelerator School, Additional references (papers, reports, other books) will be provided with each chapter. Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 8
9 Attendees 1. Koos Zevenhoven 2. Yun Zhang 3. Liyang Ye 4. Thibault Elhaut 5. Pei Li 6. Lucas Brouwer 7. Matthias Mentink 8. Zhen-yu Shu 9. Soun Kwon 10. Monika Lewandowska 11. Viktor Mokhnatyuk 12. Anne de Jager 13. Diaa-Eldin Mansour 14. Akihisa Miyazoe 15. Van Griffin 16. Matteo Alessandrini 17. Chishin Hori 18. Stuart Feltham 19. Hankil Yeom 20. Veronica Afonso Rodriguez 21. Ian Pong 22. Kenneth Guenter 23. Ronghai Qu 24. Antonio Leo 25. M'hamed Lakrimi 26. Mark Wiseman 27. Oliver Stadel 28. Md Shahriar Hossain 29. Robert Duckworth 30. Ethan Cho Design and modeling of LTS superconducting magnets, October 7, 2012 Course introduction 9
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