Coated Superconductor Cylinders for Applications in Machines
by Dr Eamonn Maher of 3-Cs Ltd

The 3-Cs approach to next-generation superconducting machines is fundamentally different from conventional approaches based on bulk materials and/or fragile superconductor windings. This alternative approach does not involve winding processes, and superconductor coils are instead fabricated by patterning Coated Conductor Cylinders. Thin superconducting films can be patterned on the curved surfaces to produce almost any coil configuration and therefore virtually any required field distribution.

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HTS accelerator magnet development at CERN.
by Mr Glyn Kirby of CERN Technology Department

Future high-energy accelerators will need very high magnetic fields in the range of 20 T. CERN is in a collaborative push to take HTS materials into an accelerator quality demonstrator magnet. The demonstrator will produce 5 T standalone and between 17 T and 20 T, when inserted into the 100 mm aperture of Fresca-2 high field out-sert magnet. The HTS magnet will demonstrate the field strength and field quality that can be achieved. An effective quench detection and protection system will have to be developed to operate with the HTS superconducting materials. This paper presents a ReBCO magnet design using multi strand Roebel cable that develops a stand-alone field of 5 T in a 40 mm clear aperture and discusses the challenges associated with good field quality using this type of material. A selection of magnet designs is presented as result of a first phase of development.

HTS Armature Design for Fully HTS Machines
by Dr Min Zhang & Dr Wijia Yuan of Department of Electronic and Electrical Engineering, University of Bath

HTS armature design for fully HTS machines  (UK magnetic society seminar) Min Zhang, Weijia Yuan, Department of Electronic and Electrical Engineering, University of Bath Fully HTS machines have become a new research focus, since they can provide the high power density for electrical propulsion and offshore wind generation. The key technique challenge of developing fully HTS machines lies in the design of HTS alternating current winding (HTS armature). The presentation reviews the latest progress on the development of HTS armature for fully HTS machines. It then focuses on the HTS armature design using 2G HTS.  The presentation provides a detailed study on AC loss estimation for HTS armatures, as well as a novel winding arrangement to reduce harmonics and eddy current loss.

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HTS – An Enabling Technology for Spherical Tokamak Fusion Reactors
by Paul Noonan of Tokamak Energy

The theoretical potential of spherical tokamaks as compact fusion energy devices has been known for some time. However the engineering of the compact central column has always been seen as an obstacle to practical application. Tokamak Energy is a venture capital company set up to exploit the properties of HTS to overcome this barrier, and so open the way to rapid development of a commercial fusion reactor. The talk explains the challenges, and our strategy for overcoming them.

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HTS Systems for Hybrid Electric Aircraft part 2
by Peter Malkin of Cranfield University

This part of the presentation attempts to answer the question as to why this represents a major opportunity for HTS power systems and why HTs power networks are ideally adapted to this area

HTS motors and Generators
by Tim Coombs of Cambridge University

Considerable advances have been made in recent years in HTS tape. Critical currents have been raised, longer continuous lengths have been fabricated and structural strength has been improved. Progress towards ever lower resistance and even no resistance joints has been made but the presence of resistance in the joints (together with price) still means that LTS is preferred in applications such as MRI. The Electrical Power and Energy Conversion (EPEC) superconductivity group at Cambridge University has been working on the use of flux pumping to activate superconducting coils in motors and magnets in general. In this paper we report the current status of the flux pumping technology. The paper will show first the fundamental principles of the flux pump, second the performance and finally the potential applications both in the near and the far term. Flux pumping enables the magnetisation of superconducting permanent magnets by the application of time varying magnetic fields. Using this technique means that superconducting coils can be operated in persistent mode without the need for either current leads or a persistent current switch and that magnetisation can be achieved without the need for high current power supplies or external sources of magnetic fields. We will present both experimental and modelling results showing the present and expected future behaviour of flux pumped coils.

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HTS Magnets for Research Applications
by Dr Ziad Melhem of Oxford Instruments NanoScience

The talk presents an overview of new generation of superconducting magnets for research. In particular the emphasis is on the current performance of HTS materials and their impact on developing new generation of high field superconducting technology and the dependence of high fields and research magnets. The production of high magnetic fields using low temperature superconductors (LTS) has become common place. However, the large magnet sizes and their associated high cooling costs have often precluded the full utilization of these research capabilities. Recent advances in cooling technology together with advances in high temperature superconductors (HTS) have opened up a new era in superconducting magnet development. A new generation of superconducting magnets is undergoing development and exploits the current performance of HTS and LTS materials.

HTS SFCL in the University of Manchester
by Xiaoze Pei of The University of Manchester

The development and use of renewable energy is key to reducing the environmental impact of fossil fuels. The increased renewable energy generation increases fault levels creating problems for existing protection equipment on the low voltage distribution networks. Superconducting fault current limiters (SFCLs) installed at strategic points in an electrical network can circumvent the necessity to upgrade existing protection equipment This talk presents the development of an 11kV, 1250A resistive SFCL for the distribution network as part of an ETI consortium project. The presentation focuses on the superconducting coil design using multi-stranded MgB2 wire. The work carried out to assess the current capacity and AC losses for several multi-strand MgB2 wire configurations for SFCL applications is presented. This presentation also covers an SFCL integrated with a vacuum interrupter, which represents a potential resistive SFCL system that is controllable, compact and quick to recover. Finally, two novel hybrid DC circuit breakers were presented and validated at low voltage levels. Design of a 10 kV / 5 kA test circuit and prototype DC circuit breaker is underway. The presentation concludes with the chances and challenges for designing and building a resistive SFCL for distribution networks and a HVDC circuit breaker using superconductor.

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