Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Open Doors Day | An intense and unforgettable experience

    Saturday was Jacques's birthday. At age 90, the long-retired engineer from Aix-en-Provence had only one item on his wish list: to visit ITER for a third time an [...]

    Read more

  • Power conversion | A potent illustration of the "One ITER" spirit

    Europe made the buildings; the piping came from India; China and Korea provided the transformers; Russia manufactured the massive 'busbar' network. The ITER Org [...]

    Read more

  • Fusion world | Upgrade completed on DIII-D tokamak

    The DIII-D National Fusion Program (US) has completed a series of important enhancements to its fusion facility, providing researchers with several first-of-a-k [...]

    Read more

  • Vacuum lab | Ensuring leak test sensitivity

    A helium leak test is one of several factory acceptance tests planned for the sectors of the ITER vacuum vessel before they are shipped to ITER. In a vacuum lab [...]

    Read more

  • Bookmark | The Future of Fusion Energy

    To write about fusion is to walk a fine line between the temptation of lyricism and the arid demands of scientific accuracy. Whereas the general media tends to [...]

    Read more

Of Interest

See archived entries

Way forward paved for ITER's feeder system

Sabina Griffith

ITER Director-General Osamu Motojima and the Head of the Chinese Domestic Agency, Luo Delong, after the signature. Participating in the ceremony were Chen-yu Gung, Neil Mitchell and Gary Johnson. (Click to view larger version...)
ITER Director-General Osamu Motojima and the Head of the Chinese Domestic Agency, Luo Delong, after the signature. Participating in the ceremony were Chen-yu Gung, Neil Mitchell and Gary Johnson.
Feeders convey and regulate the cryogenic liquids to cool and control the temperature of ITER's powerful magnets; they also connect the magnets to their power supply. (Click to view larger version...)
Feeders convey and regulate the cryogenic liquids to cool and control the temperature of ITER's powerful magnets; they also connect the magnets to their power supply.
They are not the most "jazzy" components of the ITER Tokamak, but they are vital for its operation. The ITER feeders will be manufactured by Chinese enterprises under the supervision of the Chinese Domestic Agency and are scheduled to be delivered in several steps to the ITER site. The Procurement Arrangement that paves the way for the manufacturing of this system was signed this Wednesday 26 January by ITER Director-General Osamu Motojima and the head of the Chinese Domestic Agency, Luo Delong.

In total there will be 31 feeders relaying the electrical power and cryogens through the warm-cold barrier to the ITER magnets. Each feeder consists of three main units: the in-cryostat feeder, the cryostat feed-through and the coil terminal box which provides the housing for the connections of the magnets and 12 other interface systems.

The design operating current of the feeders is 68 kA. High temperature superconductor (HTS) current leads transmit the high-power currents from the room-temperature power supplies to the low-temperature superconducting coils 4 K (-269 °C) with minimum heat load. Superconducting busbars—made out of steel conduit containing niobium-titanium superconductor cable—are designed to absorb the large temperature variations during the cool-down of the machine. They also withstand the various Lorentz forces acting on the material connecting the current lead and the magnet. The most challenging issues remaining are the electrical and mechanical designs of the high-voltage insulation.

 "As a responsible partner of ITER, we are confident to carry out the task and deliver the feeders as well as other procurement packages allocated to China as requested under the strong leadership of the Minister of Science and Technology," said Luo Delong during the signature ceremony. Gary Johnson, Deputy Director-General and head of the ITER Tokamak Department, added: "The signing of this Procurement Arrangement was the result of an excellent collaborative effort involving many within the ITER Organization and the Chinese Domestic Agency. In particular, work on the models and drawings has been going on at ITER and in China for many months and is a model for design cooperation. This is a very critical Procurement Arrangement and an important accomplishment for the project. I offer my congratulations to the entire ITER Organization and Chinese Domestic Agency teams."

For Neil Mitchell, head of the ITER Magnet Division, the signature was a mix of relief ... and pride: "This signature brings the total number of magnet Procurement Arrangements to 20, with just one left to go. It was one of the more challenging, not because of especially advanced technology, but because of the complex interfaces with many of the main tokamak systems and components. It is a relief to get it to the stage where manufacturing development can get underway in China in parallel with some design refinements to reduce costs."


return to the latest published articles