Enable Recite

Subscribe options

Select your newsletters:

Please enter your email address:

@

Your email address will only be used for the purpose of sending you the ITER Organization publication(s) that you have requested. ITER Organization will not transfer your email address or other personal data to any other party or use it for commercial purposes.

If you change your mind, you can easily unsubscribe by clicking the unsubscribe option at the bottom of an email you've received from ITER Organization.

For more information, see our Privacy policy.

News & Media

Latest ITER Newsline

  • Remembering Bernard Bigot, ITER Director-General 2015-2022

    On the ITER site, the machinery of construction was humming just like on any weekday. Workers were concentrating on their tasks, laying rebar for new buildings [...]

    Read more

  • Tokamak assembly | Preparing for the Big Lift

    The distance was short but the challenge daunting: on Thursday last week, the first section of the plasma chamber was lifted 50 centimetres above its suppor [...]

    Read more

  • Image of the week | 13th toroidal field coil arrives from Europe

    The toroidal field coil procurement effort has been one of the longest of the ITER program, initiated by Procurement Arrangements signed in 2007 and 2008. Manuf [...]

    Read more

  • Diagnostics | Final Procurement Arrangement signed

    ITER Diagnostics reached an important milestone in December 2021 when it concluded the last Procurement Arrangement of the diagnostics program. After signing a [...]

    Read more

  • On site | A quick visit to the Control Building

    Work is progressing on the ITER Control Building, ergonomically designed for the 60 to 80 operators, engineers and researchers who will call it home.  [...]

    Read more

Of Interest

See archived entries

CERN's swift action allows Japan to proceed

Two of the samples prepared and tested within the scope of the verification measurements: A wire is mounted and soldered on the TiAlV sample holder ready for critical current testing (background), and a miniature coil used for the magnetization of the superconductor magnetization and associated hysteresis loss (foreground). (Click to view larger version...)
Two of the samples prepared and tested within the scope of the verification measurements: A wire is mounted and soldered on the TiAlV sample holder ready for critical current testing (background), and a miniature coil used for the magnetization of the superconductor magnetization and associated hysteresis loss (foreground).
A mandatory step in the manufacturing process of the superconducting wires for the ITER magnets is the measurement of the wire performance at each of the suppliers. This quality control step is complemented by an independent verification measurement performed by the Domestic Agency responsible for the supplier.

This strict acceptance procedure guarantees that the tight performance specifications of the ITER cables are met. Once the compliance with the specification is verified, the Domestic Agency clears the billet Authorization to Proceed Points (ATPPs) authorizing the fabrication of the superconducting cable, the next phase in the ITER magnet production. It is of obvious importance that the Quality Assurance measurements follow a tight schedule, avoiding delays in the magnet manufacturing.

This process was disrupted by the earthquake that hit Japan in March 2011, and dramatically affected operation at the Japanese Domestic Agency. The ITER Organization took swift action to assist the Japanese Domestic Agency by drawing on the capacity present at the ITER Organization Reference and Training Laboratory, a fruit of the CERN-ITER collaboration formed in July 2009.

Support came in the form of verification measurements on 12 billets of Nb3Sn bronze route strand for the ITER toroidal field magnets, recently produced by one of the Japanese suppliers. The verification measurements consist in critical current, hysteresis loss and residual resistivity ratio measurements of samples coming from each billet. Typical samples for these measurements are shown in the picture.

These measurements were carried out with the highest priority at CERN since the time available was quite short. The wire lengths for the samples preparation arrived at CERN on 23 May. About three weeks were necessary for the heat treatment of the material to form the superconducting phase, and the measurement results had to be released by 15 July.

Measurements started on 16 June, and the last sample was tested on 13 July. Preliminary data was released during the measurement process, to provide early feed-back on results, and the analyzed data was finally sent to the ITER Organization on 15 July, just making the deadline. All the samples satisfied the ITER specifications and now the Japanese Domestic Agency can proceed in time with the next production step.


return to the latest published articles