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

  • Thermal shield | Practising the embrace

    In the ITER Assembly Hall, fitting tests are underway on two outboard thermal shield panels. Once paired, the 11-metre-tall, silver-plated components will [...]

    Read more

  • Image of the week | This circle is for the ring

    Another concentric circle has been drawn at the bottom of the machine assembly pit, formed by the temporary supports recently installed for poloidal field coil [...]

    Read more

  • Feeders | Multi-lane thruways into the machine

    The ITER superconducting coils thrive on a simple diet of electrical power and cooling fluids. The industrial installation on site is scaled to provide both, bu [...]

    Read more

  • Cryostat Workshop | Top lid enters the stage

    In this vast workshop over the past five years, the different sections of the ITER cryostat have been assembled and welded under India's responsibility. The bas [...]

    Read more

  • Blanket first wall | Manufacturing kicks off in Europe

    For one of the most demanding technological components of the ITER machine—the first wall of the blanket—the European Domestic Agency Fusion for Energy made the [...]

    Read more

Of Interest

See archived entries

Diagnostics experts converge at Headquarters

The ITPA Topical Group on Diagnostics advises the ITER Organization on diagnostic requirements, organizes joint experiments on diagnostic techniques, supports ITER operation and advances diagnostics for DEMO and future reactors. (Click to view larger version...)
The ITPA Topical Group on Diagnostics advises the ITER Organization on diagnostic requirements, organizes joint experiments on diagnostic techniques, supports ITER operation and advances diagnostics for DEMO and future reactors.
The International Tokamak Physics Activity (ITPA) Topical Group on Diagnostics (Diagnostic TG) held its 25th meeting at the ITER site from 15-18 October. The group has a wide remit, starting from advising the ITER Organization on diagnostic requirements, passing through proposing, planning and reporting on joint experiments on diagnostic techniques and analysis, and culminating with supporting ITER operation and advancing diagnostics for DEMO and future reactors.

At the meeting, chaired by Yasunori Kawano, extensive progress was reported on mirror cleaning techniques for optical measurements. This type of technology will be deployed for the first time in ITER, where the extended plasma burn times (4700 hours) combined with the high energy bombardment of the first-wall components can lead to rough mixed-metal build-up on the mirrors. Progress was also made in understanding and reducing the impact of wall reflections. For all-metal wall machines such as ITER, these can distort or even mask the signals from optical diagnostics.

A discussion on escaping alpha particles produced in the fusion burn resulted in the launching a new activity for further investigation, including a proposed new method. Measurements and techniques for dust, tritium and erosion were discussed in a special session. These measurements are needed so ITER can plan its operation and maintenance well within regulatory limits and to gain understanding on the way to DEMO.

A new joint experiment for the systematic comparison of Charge Exchange Recombination Spectroscopy and X-ray Imaging Crystal Spectroscopy was presented. These diagnostics measure ion temperature and plasma rotation—both parameters necessary to steering the machine.

The group also discussed progress with neutron calibration during a special two-day ITER Organization workshop. This is an important area for ITER, both for regulatory compliance and to reduce the uncertainties in extrapolating ITER performance to DEMO.

This was the first meeting of the Diagnostic TG to be held at ITER Headquarters, and the first to make use of remote participation in the auditorium. It was combined with a one-day progress meeting of ITER Organization Diagnostics Division. "Participation was better than average, with all parties represented and good progress in key areas reported," said Chair Kawano.

The group's next meeting is planned for the first week of June 2014, in Korea.



return to the latest published articles