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News & Media

Latest ITER Newsline

  • Making remote handling less remote

    Over a wet and windy three-day period on the ITER site in November, around 90 representatives of the ITER Organization, the Domestic Agencies of Europe and Japa [...]

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  • The framework for sharing ITER intellectual property

    In signing the ITER Agreement in 2006, the seven ITER Members were agreeing not only to share in the costs of constructing and operating the ITER facility, but [...]

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  • Wendelstein achieves ultra-precise magnetic topology

    A recent article in the online journal Nature Communications confirms that the complex topology of the magnetic field of Wendelstein 7-X—the world's largest ste [...]

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  • The Matrix, rigid and fluid

    A fast-growing array of structures and buildings has been emerging across the ITER worksite platform under the control and supervision of the European Domestic [...]

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  • By road, river and sea

    They travelled by road from the Air Liquide factory near Grenoble, sailed down the Rhône River from Lyon and entered the Mediterranean to the east of Fos-sur-Me [...]

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Of Interest

See archived articles

HTS workshop for future fusion applications

-Sabina Griffith

 (Click to view larger version...)
In order to achieve superconductivity, the NbTi and Nb3Sn conductors inside ITER's magnets will have to be cooled down with supercritical helium in the temperature range of 4 Kelvin (-269°C)—a process that requires substantial amounts of energy that impact the net energy gain. The efficiency of future fusion power plants could be drastically increased if superconductors could be operated at higher temperatures (> 65K) using affordable liquid nitrogen, for example, instead of supercritical helium as coolant.

"Targeting a future commercial fusion machine, it may be very demanding to avoid liquid helium cooling for the coil system," Walter Fietz from the Karlsruhe Institute of Technology (KIT) in Germany writes in an article for Fusion Engineering and Design. "This would require less refrigeration power and allow omitting the radiation shield of the coils, resulting in a less complex cryostat and a size reduction of the machine."  

"Having a material at hand that can transport currents without losses, that would be a dream," says Jean-Luc Duchateau from CEA who developed the superconducting tokamak Tore Supra. There are many materials being tested in labs around the world. At KIT in Karlsruhe, scientists have been experimenting for many years with a material that holds all the promises for successful application in the harsh environment of a fusion reactor: Yttrium Barium Copper Oxide, a crystalline chemical compound abbreviated as "YBCO". The material's operating temperature is in the range of around 50K and its physical behavior in high magnetic fields brings it very close to Jean-Luc Duchateau's dream come true. The downside, however, is that so far it has not been possible to produce reliable strands out of YBCO.
 
In order to coordinate international efforts, a workshop is being organized at KIT on 26-27 May to further investigate options of HTS for high current and high fields for DEMO and future fusion applications. The workshop's flyer can be downloaded here .


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