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7-X Stellarator

  1. Nov 4, 2015 #1
    Here's an interesting article (from the magazine Science) about the Wendelstein 7-X Stellarator which is due to be switched on at the end of the month-

    'The bizarre reactor that might save nuclear fusion'

    Construction video-
  2. jcsd
  3. Nov 4, 2015 #2
    What's interesting about this is it shows how fast fusion experiments can be built when not bogged down by the politics of a global regulatory committee like ITER. China is already making plans to build it's own tokamak that could be finished before DEMO.
  4. Nov 4, 2015 #3
    I'm really not sure how you reached this conclusion. W7-X was originally supposed to have its first plasma in 2006! It's hard to argue that a project was built quickly when it was completed almost a decade behind schedule.
  5. Nov 6, 2015 #4
    In fusion years, I'd say a decade is pretty quick! Considering ITER's first concept designs were in the 70's? And it's still nowhere near completion.

    Granted, I realize W7X is a much smaller scale project but it does have it's own unique engineering challenges.
  6. Nov 7, 2015 #5
    The first ITER talks were in 1985. ITER was born out of the INTOR workshops. The first of which was in 78 or 79? The ITER treaty was signed in 2006 and construction of the ITER site started in 2008. Who knows when ITER will have first plasma.

    The first W7-X design concepts were in the early 90's (93-94) following the unification of Germany. Construction of IPP Greifswald started in 94 and the construction of W7-X started around 2000. It was originally supposed to be completed by 2006. It took ~15 years to build W7-X and its over 20 years since the first design concepts.

    For comparison it took 5 years to build JET, It took 5 years to build Alcator C-MOD. Design of NSTX started in 1995, assembly started in 1998, and first plasma was in 1999. (NSTX was built in the old TFTR pit and assembly only took a few months). I couldn't find any information of DIII (-D). The chiense EAST tokamak took 10 years, the Korean tokamak KSTAR took 13 years, and the Japanese Stellarator LHD took 8 years.

    Don't get me wrong, I'm really excited for the start-up of W7-X. But its not the exemplar of an quick construction project. Not by fusion standards.
  7. Nov 7, 2015 #6


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    The DIII-D was first operated in 1986, and it's predecessor Doublet-III (or Doublet 3) was started around 1979, with construction in 1975.

    There is an EPRI report published in 1975 on Doublet-III and various texts cover Doublet-III and DIII-D.

    EPRI 115-2 (Oct 1975) Fusion reactor studies: Doublet III design

    Tokamak Engineering Mechanics
    DIII-D 1986

    Theory of Tokamak Transport: New Aspects for Nuclear Fusion Reactor Design
    Doublet III (or Doublet 3) 1979

    Before Doublet-III, there was Doublet-II. I suspect that it is discussion in various journals on Fusion Engineering.
    Confinement of Plasma in the Doublet-II Device

    Nuclear Fusion: Half a Century of Magnetic Confinement
    Doublet I preceded Doublet II (1972-1974). A table dates Doublet IIA (1974-1979), Doublet III (1978-1985). I believe Doublet III was a separate device, and Doublet II was scrapped.

    DIII-D has received a number of upgrades since it's introduction.



    A design retrospective of the DIII-D tokamak
  8. Feb 3, 2016 #7


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    Scientists in Germany switch on nuclear fusion experiment
    https://finance.yahoo.com/news/scientists-inject-fuel-experimental-fusion-device-071639314.html [Broken]

    Wendelstein 7-X fusion device produces its first hydrogen plasma

    Last edited by a moderator: May 7, 2017
  9. Feb 4, 2016 #8


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    "Fusion" experiment.
    They don't plan to have relevant fusion power in that device. It is a plasma experiment, although the plasma is mainly studied for future fusion reactors.
  10. Feb 4, 2016 #9


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    Perhaps a more correct description is "plasma physics" or "plasma stability" experiment.
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