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  • Construction | Art around every corner

    Most of us have experienced it. Turning a corner in one of the Tokamak Building galleries and looking up at the graphic pattern of embedded plates in the concre [...]

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  • Machine | Ensuring port plugs will work as planned

    The stainless steel plugs sealing off each Tokamak port opening are not only massive, they are also complex—carrying and protecting some of the precious payload [...]

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  • Networks | Ensuring real-time distributed computing at ITER

    Many of the control systems at ITER require quick response and a high degree of determinism. If commands go out late, the state of the machine may have changed [...]

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  • Fusion codes and standards | Award for ITER Japan's Hideo Nakajima

    Hideo Nakajima, a senior engineer at ITER Japan, has received an award from the Japan Society of Mechanical Engineers (JSME) for his contribution to the develop [...]

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  • Machine assembly | First magnet in place

    When it travelled the ITER Itinerary last year, or during cold tests in the onsite winding facility, poloidal field coil #6 (PF6) felt rather large and massive. [...]

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Of Interest

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Image of the week

Don't get mixed up!

In case of a sudden loss of superconductivity in the ITER magnets (a "quench") the helium that circulates in the coils will be almost instantly discharged into dedicated double-wall quench tanks.

This complex set of hand valves and local readings of pressure, temperature and flow is part of the cooling loop that maintains the temperature inside the quench tanks at 100 K. It will provide field operators with a convenient tool for maintenance operations. (Click to view larger version...)
This complex set of hand valves and local readings of pressure, temperature and flow is part of the cooling loop that maintains the temperature inside the quench tanks at 100 K. It will provide field operators with a convenient tool for maintenance operations.
If the tanks were at ambient temperature, the thermal shock caused by cryogenic helium discharged from the magnets at just above 4 K (minus 269 °C) would result in considerable stress and shrinkage to the tank structures.

In order to prevent such a potentially damaging event, the inner vessels of the tanks must be cooled to cryogenic temperature whenever the machine is in operation. This is achieved through a cooling loop that maintains the temperature inside the tanks at 100 K (minus 173 °C)—a temperature at which shrinking has already occurred.

This valve and instrumentation panel outside of the cryoplant is part of that loop. Although measurement signals and activators from all cryogenic systems interface with the CODAC human-machine interface in the local cryo-control room, the outdoor instrumentation panel with its dozens of hand valves and local readings of pressure, temperature and flow provides field operators with a convenient tool for maintenance operations.

 


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