Subscribe options

Select your newsletters:


Please enter your email address:

@

News & Media

Latest ITER Newsline

  • Image of the week | Tokamak-sur-mer

    At the height of the heat wave, in late June, surface temperature on the ITER worksite climbed to the 50 °C range. To continue work—and protect workers—a series [...]

    Read more

  • Space propulsion | Have fusion, will travel

    The idea of propelling rockets and spaceships using the power of the atom is nothing new: the Manhattan Project in the mid-1940s as well as countless endeavours [...]

    Read more

  • Cold fusion | End of story?

    Thirty years ago, two electrochemists at the University of Utah, Martin Fleischmann and Stanley Pons, created a sensation when they claimed they had achieved fu [...]

    Read more

  • Magnet feeders | Wave of deliveries ahead

    Several batches of magnet feeder components will arrive from China in September containing elements that need to be received, inspected and readied for installa [...]

    Read more

  • Tokamak cooling system procurement | Global team for better efficiency

    A unique work-sharing arrangement is expediting the design and fabrication of ITER's tokamak cooling water system and building the knowledge base that will be c [...]

    Read more

Of Interest

See archived entries

Panel confirms gas manifold system design

ITER China

The gas distribution manifold system is needed to deliver different gas species from the Tritium Plant to the vacuum vessel. Prototype junction configurations have been produced to test manufacturability and assembly feasibility. (Click to view larger version...)
The gas distribution manifold system is needed to deliver different gas species from the Tritium Plant to the vacuum vessel. Prototype junction configurations have been produced to test manufacturability and assembly feasibility.
The final design review of the gas distribution manifold system, part of ITER's gas injection system, was held from 8 to 10 December 2015 in Chengdu, China. More than 40 participants attended the review either on-site or remotely, including 13 panel members and participants from the ITER Organization, the Chinese Domestic Agency, and the contracting institute Southwestern Institute of Physics.

The gas injection system in ITER is responsible for the "initial fill" of the vacuum chamber prior to plasma initiation; for puffing gas into the chamber during the ramp-up phase; for controlling plasma density during the flattop of plasma burn; and for protecting the divertor targets from discharges by injecting impurity gases.

In order to service the pellet injection, gas fuelling, neutral beam and disruption mitigation systems, different gas species from the Tritium Plant (hydrogenic species, helium, and the impurity gases argon, neon and nitrogen) will be delivered via a gas distribution manifold to gas valve boxes located in the vacuum vessels ports. According to the ITER machine assembly schedule, this gas distribution manifold system is expected on site before the rest of the gas injection system; for this reason, a separate design review was organized.

The three-day review took place in December in China with participants from the ITER Organization, the Chinese Domestic Agency, and the contracting institute Southwestern Institute of Physics. (Click to view larger version...)
The three-day review took place in December in China with participants from the ITER Organization, the Chinese Domestic Agency, and the contracting institute Southwestern Institute of Physics.
The manifold system consists of six gas supply lines and one evacuation line enclosed in a guard pipe for safe tritium handling. The main design challenge has been to avoid the interference of pipe junctions in vertical and horizontal directions, while taking into account the limited available space along the manifold route and the feasibility of assembly and maintenance. During the optimization process, up to four junction configurations were designed for each type of gas valve box. Prototypes of the different elements of the gas distribution manifold system have been produced to test manufacturability and assembly feasibility, and to allow for further optimization.

Prof. Wang Yan, the chairman of the review panel, confirmed the suitability of the design and thanked the manifold team members for their hard work and effort. Based on feedback from the review, the focus will now be to perfect the design and ensure a smooth transition from the final design phase to the manufacturing readiness review phase.


return to the latest published articles