Biography 

Professor Damian Hampshire is head of the Superconductivity Group in the Physics Department in Durham University, England. He is a member of IoP Fellows panel and the Executive Board of the British Cryogenics Council. He was PI for the European Reference Laboratory for Fusion Energy; Chairman of the International Programme Committee for the European Conference on Applied Superconductivity, EuCAS (Glasgow) 2019; Editor-in-chief of the IoP journal Superconductor Science and Technology (2006-2013) and founding Director of the Centre for Materials Physics in Durham (2010).

Research highlights include: Experimental [1], theoretical [2], computational evidence [3] and visualisation [4] that in polycrystalline materials, flux-flow is along channels (i.e. grain-boundaries in polycrystalline materials) that limit the critical current density (Jc) to less than 1% of the theoretical limit in high magnetic fields; The design, in-house fabrication, development and operation of variable-temperature instruments for measuring, developing and understanding the strain-dependant critical current density of superconductors in magnetic fields in-house and at international high magnetic field facilities [5]; The discovery of a new class of nanocrystalline materials where the high magnetic field properties are improved by making the length scales for the microstructure to be similar to the superconducting coherence length [6]; Development of the metrology for measuring large numbers of high-field superconducting strands for the $50 B fusion energy tokamak being built in France and the development of joints for the commercial exploitation of fusion energy [7]. 

[1] Guanmei Wang, Mark J. Raine, and Damian P. Hampshire.  How resistive must grain boundaries in polycrystalline superconductors be, to limit Jc? - SUST 20 104001 (2017)   [2] G. J. Carty and D. P. Hampshire -  The critical current density of an SNS Josephson-junction in high magnetic fields - SuST 26 065007 (2013)  [3,4] G. J. Carty and D. P. Hampshire - Visualising the mechanism that determines the critical current density in polycrystalline superconductors using time-dependent Ginzburg-Landau theory - Phys. Rev. B. 77 (2008) 172501 [5] Kozo Osamura, Shutaro Machiya and Damian Hampshire.  Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes - SUST 29 065019 (2016) D. M. J. Taylor and D. P. Hampshire - The scaling law for the strain-dependence of the critical current density in Nb3Sn superconducting wires - Supercond. Sci. Tech 18 (2005) S241-S252 [6] H J Niu and D P Hampshire - Disordered Nanocrystalline Superconducting PbMo6S8 with a Very Large Upper Critical Field. Phys. Rev. Lett 91 027002 (2003) [7] T. Lee, I. Jenkins, E. Surrey and D. P. Hampshire -  Optimal design of a toroidal field magnet system and cost of electricity implications for a tokamak using high temperature superconductors Fusion Engineering and Design 98 (2015) DOI: 10.1016/j.fusengdes.2015.06.125

Abstract

Figure 1:  The (16) Nb3Sn toroidal field coils)  - each coil weighs 290 tonnes.  Each starts with 1100 wires ~ 0.81 mm diameter that are twisted into a 40 mm tube to form a conductor 820 m long. 

To make world-class high-field measurements on superconductors in high magnetic fields you need a combination of a good scientific environment, experience of in-house design of instruments, access to international high-field facilities, world-class research students and post-docs, funding, hard work, intuition and some luck. Durham has housed the European Reference Laboratory in which we have made thousands of different transport and magnetic measurements on Nb3Sn wires in high fields for the TF coils of the ITER program. 

Figure 2: The critical current of Nb3Sn as a function of magnetic field, temperature and applied strain. 

This talk will review the most important types of measurements in applied superconductivity. It will include visualisation of the flux-line-lattice in high fields superconductors, some comments about the experience gained making the reference laboratory measurements and detailed considerations of how to make both room temperature measurements and cryogenic measurements on both low temperature and high temperature superconductors at high-field International facilities and in-house. 


Key dates

Abstract submission deadline [EXTENDED]:

25 June 2021

Registration deadline:

01 July 2021