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SUMMARY:Radiation Effects on Fusion Magnet Components
DTSTART;VALUE=DATE-TIME:20100225T130000Z
DTEND;VALUE=DATE-TIME:20100225T150000Z
DTSTAMP;VALUE=DATE-TIME:20130519T234847Z
UID:indico-event-84226@cern.ch
DESCRIPTION:Applications of large superconducting magnets\, e.g. in partic
 le accelerators or in nuclear fusion devices\, require a safe magnet opera
 tion over the plant lifetime. Therefore\, "material test programmes" in a 
 specific radiation environment to simulate the operating conditions of the
  magnet and to assess the radiation response of each of the magnet compone
 nts are essential.\nIn a brief introduction\, I’ll review the radiation 
 environment expected at the magnet location of a fusion device\, either of
  ITER or of design studies for later fusion power reactors. According to t
 he present state of the art\, the magnets will consist of metallic superco
 nductors operating at liquid helium temperatures\, i.e. stabilised multifi
 lamentary conductors made from Nb3Sn or similar compounds\, and of glass-f
 ibre reinforced epoxies as the insulation material.\nExperimental results 
 on the radiation-induced changes of the critical current densities Jc\, th
 e transition temperature Tc and the upper critical field Hc2 of the superc
 onductors\, on the resistivity of the stabiliser\, and on the mechanical a
 nd electrical properties of the insulating materials will be presented and
  evaluated in terms of the requirements set for this application. We will 
 conclude that the currently envisaged superconductors are suitable for ITE
 R\, but that the insulation will need modifications\, i.e. the epoxies wil
 l have to be replaced by radiation-harder compounds (cyanate ester / epoxy
  blends). The corresponding qualifica tion programmes for ITER are current
 ly under way at ATI.\nFinally\, radiation effects on high temperature supe
 rconductors will be discussed. Although these materials are presently not 
 suited for the construction of superconducting high field magnets operatin
 g in the liquid nitrogen temperature range\, they will certainly play an i
 mportant role in the future. The results show that irradiation of these ma
 terials by suitable particles\, in particular fast neutrons\, leads to an 
 enormous improvement of their flux pinning capability. Considering the rap
 id developments in this field of research\, in particular the dramatic imp
 rovements in the processing technologies\, predictions on their role in fu
 ture fusion devices are somewhat premature. It is\, however\, obvious that
  extended dedicated R&D efforts will be required to reach this goal.\n\nht
 tp://indico.cern.ch/conferenceDisplay.py?confId=84226
LOCATION:CERN Kjell Johnsen Auditorium
URL:http://indico.cern.ch/conferenceDisplay.py?confId=84226
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