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

  • Vacuum vessel | Sector #6 is leak tight

    The first ITER vacuum vessel sector has passed a helium leak test on site with flying colours. Back in March 2020, as experts from the Korean Domestic Agency [...]

    Read more

  • Vacuum vessel | India completes in-wall shielding package

    The Indian Domestic Agency has completed the procurement of about 9,000 in-wall shielding blocks and accompanying support ribs, brackets and fasteners. The majo [...]

    Read more

  • Image of the week | Feeders for the coils

    One by one, whether large or small, the elements of the system that delivers electrical power, cryogenic fluids and instrumentation to the ITER magnets are arri [...]

    Read more

  • Busbar installation | "Power cords" thicker than train rails

    Connecting an electrical device to a power source requires an extension cord, generally made of stranded copper wire. Depending on the required current intensit [...]

    Read more

  • Manufacturing | The next sector in line

    Thanks to the experience acquired during the fabrication of the first production unit of the vacuum vessel, the Korean Domestic Agency and contractor Hyundai He [...]

    Read more

Of Interest

See archived entries

Sensor prototypes to measure magnetic field

One of the LTCC sensor prototypes manufactured for the European Domestic Agency by Via Electronic. (Click to view larger version...)
One of the LTCC sensor prototypes manufactured for the European Domestic Agency by Via Electronic.
The European Domestic Agency is collaborating with German supplier Via Electronic on sensors for measuring magnetic field. Installed in the heart of the ITER machine, more than 200 of these instruments will be relied on to provide vital information in the control of the ITER plasma. 

Via Electronic is producing a series of 40 prototypes, working closely with the European agency to optimize design parameters. Each prototype consists of 34 ceramic layers, 30 of which contain a screen-printed spiral coil circuit made out of pure silver. The individual spirals, which have a width of 400 µm and a height of 12 µm, are connected together with inter-layer "vias," so that the whole assembly forms a single pick-up coil. Low-temperature co-fired ceramic manufacturing (LTCC) produces a very robust product that is fully encapsulated in ceramic.

"It's important for these sensors to be particularly robust as they will be located in a very harsh environment close to the plasma, with extremely limited access once ITER operation begins," says Shakeib Arshad, Europe's technical officer for this equipment. "Although this type of technology has been used extensively in other applications, for example in medical equipment, it is unconventional in fusion because simpler technology was adequate in the smaller tokamaks built up until now."

Following the fabrication of a first batch of prototypes in 2014, several refinements were made to the original design. Eight variants are being produced with different wiring schemes and electrical screen thicknesses. 

The European Domestic Agency is also preparing two additional contracts for the fabrication of similar prototypes by other suppliers. "As the next step, these prototypes will be irradiation tested in a fission reactor, in order to establish their performance in an ITER-like environment," says Sandra Julià Torres, Europe's officer for the prototyping contracts. "Irradiation testing is costly and the results can depend on subtle manufacturing details. Prototypes from several manufacturers are desirable for this reason."

Irradiation testing will be carried out by NRG in The Netherlands and CVR in the Czech Republic. Additionally, a computer model is being developed by the Belgian Nuclear Research Centre SCK-CEN in order to help with interpretation of the irradiation tests.

Read the original article on the European Domestic Agency website.


return to the latest published articles