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Latest ITER Newsline

  • A world in itself

    From a height of some 50 metres, you have the entire ITER worksite at your feet. The long rectangle of the Diagnostics Building stands out in the centre, with [...]

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  • US completes toroidal field deliveries for ITER

    The US Domestic Agency achieved a major milestone in February by completing the delivery of all US-supplied toroidal field conductor to the European toroidal fi [...]

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  • Thin diagnostic coils to be fitted into giant magnets

    Last week was marked by the first delivery of diagnostic components—Continuous External Rogowski (CER) coils—from the European Domestic Agency to the ITER Organ [...]

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  • Addressing the challenge of plasma disruptions

    Plasma disruptions are fast events in tokamak plasmas that lead to the complete loss of the thermal and magnetic energy stored in the plasma. The plasma control [...]

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  • Blending (almost) seamlessly into the landscape

    Located in the foothills of the French Pre-Alps, the ITER installation blends almost seamlessly into the landscape. The architects' choice ofmirror-like steel c [...]

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Of Interest

See archived articles

Fusion diagnostics heat up across the US

-Lynne Degitz, US ITER

Six of seven US diagnostic systems are in the preliminary design phase with teams actively investigating physics and engineering issues through testing, prototype development and proof-of-principle activities. Pictured: a corner cube reflector prototype for the toroidal interferometer and polarimeter diagnostic. Photo: PPPL (Click to view larger version...)
Six of seven US diagnostic systems are in the preliminary design phase with teams actively investigating physics and engineering issues through testing, prototype development and proof-of-principle activities. Pictured: a corner cube reflector prototype for the toroidal interferometer and polarimeter diagnostic. Photo: PPPL
The ITER tokamak will have over 60 diagnostic systems installed to enable plasma control, optimize plasma performance and support machine protection.

Two US laboratories, the Princeton Plasma Physics Laboratory (PPPL) and the Oak Ridge National Laboratory (ORNL) in collaboration with industry and universities, are developing the US contributions to ITER diagnostic systems. At this point, six of seven US diagnostic systems are in preliminary design with teams actively investigating physics and engineering issues through testing, prototype development and proof-of-principle activities.

"ITER diagnostics will use well-established techniques that are operational on tokamaks around the world. The challenge is designing systems that can withstand the harsh ITER operating environment," said US ITER diagnostics team leader Russ Feder of PPPL.

The first tokamak designed to sustain burning plasma, ITER will operate with pulse lengths up to an hour; diagnostic systems will potentially be exposed to high magnetic fields, neutron flux, and intense heat.

"ITER will also shake and move a lot. So we have to plan for vibrations and alignment challenges. This makes the physics and the engineering very interdependent," Feder said. "We have made major progress this year across six systems."

All of these diagnostic systems will feed information to ITER operators and scientists. One reason ITER has so many diagnostics is to provide redundant systems using different tools for measurement of similar plasma characteristics, confirming measurement accuracy.

Right now, teams are working on diagnostic systems across the US. Prototypes and testing are underway, with major recent progress occurring on the electron cyclotron emission diagnostic, the toroidal interferometer and polarimeter, and the upper infrared cameras.

Read the full story on the US ITER website.


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