BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:HIGH TEMPERATURE SUPERCONDUCTORS – WHY HAVE LARGE SCALE APPLICAT
 IONS TAKEN SO LONG? - Professor David Larbalestier of the Applied Supercon
 ductivity Center\, National High Magnetic Field Laboratory\, Tallahassee\,
  Florida\, USA
DTSTART:20070912T160000Z
DTEND:20070912T170000Z
UID:TALK7934@talks.cam.ac.uk
CONTACT:Beverley Larner
DESCRIPTION:In the months following the discovery of high-temperature supe
 rconductors (HTS) Time magazine ran the coverline “Wiring the Future - T
 he Superconductivity Revolution”. But\, 20 years later\, you might be fo
 rgiven for wondering ‘what revolution?’ Progress has been much slower 
 than expected. Getting a practical handle on the complex HTS materials has
  been at least as challenging as understanding the mechanism of high tempe
 artiure superconductivity (is there still another Nobel prize in play?1). 
 But commercial applications of HTS are emerging2\, and\, as key aspects of
  the materials technology are close to being mastered\, we can confidently
  expect many more. Much early excitement was driven by the perception that
  cooling in liquid nitrogen was both much more straightforward and much le
 ss expensive than cooling in liquid helium. But these criteria are far fro
 m sufficient: like any other new technology\, HTS must compete in all the 
 usual ways\, not only in cost but in technical capability and availability
  as well.  No technology for large scale applications is feasible without 
 conductors that can transport very high current densities 105-6 A/cm2 with
 out loss.  A key technology hurdle\, now overcome\, was to texture forms o
 f HTS such that misorientations from grain to grain are only a few degrees
  or less3-4.  Many key components of the electric utility grid have now be
 en demonstrated with HTS. The Large Hadron Collider at CERN incorporates m
 ore than 1000 HTS current leads for the main ring magnets\, while new devi
 ces such as fault current limiters and reactive power devices are being ma
 de from HTS.  In my talk I will describe some of the key materials problem
 s that have been overcome and address some of the foreseeable market appli
 cations for HTS. \n1.   Zaanen\, J. et al. Nature Phys. 2\, 138–143 (200
 6).\n2.      Malozemoff\, A.P.\, Mannhart\, J. & Scalapino\, D. Physics To
 day 58\, 41–47 (April 2005).\n3.      Larbalestier\, D.C.\, Gurevich\, A
 .\, Feldmann\, D.M. & Polyanskii\, A. Nature 414\, 368–377 (2001).\n4.  
        Clarke\, J. and Larbalestier\, D. Nature Physics 2\, 794-796 (2006)
 . 
LOCATION:McCrum Lecture Theatre\, Corpus Christi College.
END:VEVENT
END:VCALENDAR