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CATEGORIES:Cambridge Philosophical Society
SUMMARY:HIGH TEMPERATURE SUPERCONDUCTORS – WHY HAVE LARGE 
 SCALE APPLICATIONS TAKEN SO LONG? - Professor Davi
 d Larbalestier of the Applied Superconductivity Ce
 nter\, National High Magnetic Field Laboratory\, T
 allahassee\, Florida\, USA
DTSTART;TZID=Europe/London:20070912T170000
DTEND;TZID=Europe/London:20070912T180000
UID:TALK7934AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/7934
DESCRIPTION:In the months following the discovery of high-temp
 erature superconductors (HTS) Time magazine ran th
 e coverline “Wiring the Future - The Superconducti
 vity Revolution”. But\, 20 years later\, you might
  be forgiven for wondering ‘what revolution?’ Prog
 ress 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 tempeartiure superconductivity 
 (is there still another Nobel prize in play?1). Bu
 t commercial applications of HTS are emerging2\, a
 nd\, as key aspects of the materials technology ar
 e close to being mastered\, we can confidently exp
 ect many more. Much early excitement was driven by
  the perception that cooling in liquid nitrogen wa
 s both much more straightforward and much less exp
 ensive than cooling in liquid helium. But these cr
 iteria are far from sufficient: like any other new
  technology\, HTS must compete in all the usual wa
 ys\, 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 10
 5-6 A/cm2 without loss.  A key technology hurdle\,
  now overcome\, was to texture forms of HTS such t
 hat misorientations from grain to grain are only a
  few degrees or less3-4.  Many key components of t
 he electric utility grid have now been demonstrate
 d with HTS. The Large Hadron Collider at CERN inco
 rporates more than 1000 HTS current leads for the 
 main ring magnets\, while new devices such as faul
 t current limiters and reactive power devices are 
 being made from HTS.  In my talk I will describe s
 ome of the key materials problems that have been o
 vercome and address some of the foreseeable market
  applications for HTS. \n1.   Zaanen\, J. et al. N
 ature Phys. 2\, 138–143 (2006).\n2.      Malozemof
 f\, A.P.\, Mannhart\, J. & Scalapino\, D. Physics 
 Today 58\, 41–47 (April 2005).\n3.      Larbalesti
 er\, D.C.\, Gurevich\, A.\, Feldmann\, D.M. & Poly
 anskii\, A. Nature 414\, 368–377 (2001).\n4.      
    Clarke\, J. and Larbalestier\, D. Nature Physic
 s 2\, 794-796 (2006). 
LOCATION:McCrum Lecture Theatre\, Corpus Christi College.
CONTACT:Beverley Larner
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