Enable Recite

Subscribe options

Select your newsletters:

Please enter your email address:

@

Your email address will only be used for the purpose of sending you the ITER Organization publication(s) that you have requested. ITER Organization will not transfer your email address or other personal data to any other party or use it for commercial purposes.

If you change your mind, you can easily unsubscribe by clicking the unsubscribe option at the bottom of an email you've received from ITER Organization.

For more information, see our Privacy policy.

News & Media

Latest ITER Newsline

  • Nico Rosberg | Racing towards a sustainable future

    He might have retired from the active life of a racing driver, but Nico Rosberg—Formula 1 World Champion in 2016—has chosen not to hang up his hat. His new ambi [...]

    Read more

  • Vacuum vessel | Another day, another sector

    'Construction work packages,' which detail the succession of individual tasks to be performed for each and every ITER assembly activity, read like a preflight c [...]

    Read more

  • Manufacturing | Russia ships auxiliary heating equipment

    The energy-generating devices of ITER's electron cyclotron heating system—gyrotrons—require a number of auxiliary systems such as water cooling equipment, cryoc [...]

    Read more

  • Image of the week | New mayor observes ITER Christmas tradition

    Every year since the ITER Organization moved into its Headquarters building in November 2012, the tradition has been observed. A few weeks before Christmas, the [...]

    Read more

  • Cryoplant | First steps toward commissioning

    Every week since the beginning of November, a tube trailer filled with approximately 4,600 cubic metres (750 kg) of compressed gaseous helium delivers its load [...]

    Read more

Of Interest

See archived entries

Measuring fusion power

The microfission chamber unit is mounted on the vacuum vessel behind a blanket module. The base plate will be welded to the vacuum vessel, cooled by water coolant, and the plate will be cooled by heat conduction. (Click to view larger version...)
The microfission chamber unit is mounted on the vacuum vessel behind a blanket module. The base plate will be welded to the vacuum vessel, cooled by water coolant, and the plate will be cooled by heat conduction.
The measurement of the neutron emission stemming from the fusion reaction is a very important diagnostic because it is directly related to measuring the fusion power. A typical neutron counter is the fission chamber. This detector, originally developed as a monitor for fission reactors, has been applied for decades on various large fusion devices like JET in Europe, JT60 in Japan and TFTR in USA.

A micro fission chamber is a ionization chamber, i.e., a small cylinder containing argon gas and a tiny amount of uranium (235U). As a neutron hits the uranium, a fission event will be generated and a pulsed signal triggered which can be translated into the amount of power generated. In ITER, the pencil size monitors will be located inside the vacuum vessel behind the blanket modules.

Recently, the conceptual design review for the ITER micro fission chamber, an effort lead by Luciano Bertalot and Anna Encheva, was concluded successfully with no "category 1" chits (no identified showstoppers). "The stringent quality control on ITER design enforced by the conceptual design review panel makes such events rare and highlights the outstanding teamwork within  the ITER Project," a relieved Anna Encheva commented the outcome of the two-day review.

Special thanks to Anna Encheva and Luciano Bertalot for their contribution to this article.


return to the latest published articles