Subscribe options

Select your newsletters:

Please enter your email address:

@

News & Media

Latest ITER Newsline

  • FEC2020 | Seeking sponsors for 28th IAEA Fusion Energy Conference

    For only the third time since 1961, the International Atomic Energy Agency's Fusion Energy Conference will be taking place in France—hosted jointly by the Frenc [...]

    Read more

  • Nuclear safety | Under constant scrutiny

    Because one of the elements involved in the fusion reaction is the radioactive isotope tritium, and because the hydrogen fusion reaction itself generates a high [...]

    Read more

  • Power conversion | Alien structures and strange contraptions

    There are places in ITER that seem to belong to another world, places full of alien structures and strange contraptions. The feeling—a mixture of awe and puzzle [...]

    Read more

  • Tokamak Complex | A changing landscape

    For the past three years, the view from the top of the highest worksite crane has not changed much. Inside of the Tokamak Complex, 80 metres below, concrete gal [...]

    Read more

  • Ion cyclotron heating | How to pump 20 MW of power into 1 gram of plasma

    To power the ion cyclotron system, the ITER Organization and its partners are designing not only new antennas, which will be housed in the tokamak vessel, but a [...]

    Read more

Of Interest

See archived entries

Hi-tech Brillo pads answering a hot fusion problem

Nick Holloway, Tom Barret, Culham Center for Fusion Energy

When a CCFE engineer Tom Barrett and colleagues embarked on a European-wide project to design a key component to protect fusion reactors from thermal damage, they never expected their solution could come in the form of a household object.

The component in question is the exhaust system of the 'DEMO' prototype power plant. Known as the divertor, it is a trench where the hot fusion plasma will be deliberately deposited. Doing so enables heat to be conducted away while controlling impurities, and is a way of managing the ejection of power and helium waste.

Divertor target mock-ups manufactured at CCFE, in collaboration with KIT in Germany. © CCFE (Click to view larger version...)
Divertor target mock-ups manufactured at CCFE, in collaboration with KIT in Germany. © CCFE
The divertor surface will be dotted with thousands of small tungsten blocks, forming the divertor targets. Millimetres below these targets, a water coolant flow removes the waste heat and regulates the divertor's temperature, and so the structural integrity of these components is critical. Damage to the coolant pipe will mean the coolant leaks out and the whole reactor has to shut down for costly repairs. So Tom and his colleagues' job is to find a way of separating the very hot tungsten (1,500 degrees C) from the not-quite-so-hot cooling water (a mere 200 degrees C). One idea is to focus on the so-called 'interlayer' between the tungsten armour and cooling structure.

The Brillo pad team. © CCFE (Click to view larger version...)
The Brillo pad team. © CCFE
"We think the layer between the two surfaces has to be spongey, but also act as a thermal barrier as well as survive the high heat flux," Tom explains. "From our analysis it looks like a good material for the job is a kind of felt made from copper — a bit like a Brillo pad you'd use to clean your dishes."

Read the full story on the CCFE website.


return to the latest published articles