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The Integrated Modelling Expert Group (IMEG) met for its fifth meeting from 21 to 23 October. Pictured from left to right: Nong Xiang, Atsushi Fukuyama, Lang Lao (IMEG Chair), Takahisa Ozeki, Hogun Jhang, Sergei Medvedev, Victor Lukash, Wayne Houlberg, Simon Pinches (ITER Organization), Stephen Jardin, Darren McDonald, Basil Duval, Jo Lister, Indranil Bandyopadhyay, Nirmal Bisai, Bernard Guillerminet, Philippe Huynh.
For three days last month, representatives from all seven ITER Members came together at ITER Headquarters for the 5th meeting of the Integrated Modelling Expert Group (IMEG). The group meets regularly to help guide the ITER integrated modelling (IM) program and to act as an interface between Member physics modelling programs and the ITER Organization.

The aims of the ITER IM program are to meet the needs of the ITER Project for accurate predictions of ITER performance and for efficient control of ITER plasmas; to support the preparation for ITER operation; and, in the longer term, to provide the modelling and control tools required for the exploitation phase of ITER.

At the meeting chaired by Lang Lao (US), each of the Members had the opportunity to update the assembly on their respective programs before hearing about progress within the ITER Organization. Since the 2012 meeting, the ITER Organization has now established an integrated modelling prototype framework. Called the Integrated Modelling & Analysis Suite (IMAS), this framework comprises various elements including the ITER Physics Data Model that is designed to be used for both experimental and simulation data—a significant step compared to existing machines. The rules and guidelines that underpin the data model have undergone extensive review and will now be used to derive specific elements (Interface Data Structures) of the data model that are used to pass data between physics codes running in an integrated modelling workflow.

On the final day of the meeting, an introductory training session was prepared which gave the IMEG members the opportunity to gain some hands-on experience with the IMAS prototype. The expert group commended the ITER Organization for the progress made on the IMAS Framework, on the first physics workflows demonstrating a plasma simulator (based on modular prescribed and free-boundary transport simulations) and on the associated program documentation. They were also keen to encourage wider access to the IMAS Framework and further training opportunities as the framework is further developed.

More information on the ITER IM Program, how to get involved, or how to contribute to its development can be obtained by contacting Simon.Pinches@iter.org.


The poloidal field AC/DC converter bridge ...
In an important step toward powering the ITER poloidal field magnets, Chinese industry delivered the first poloidal field AC/DC converter bridge and external bypass to the Institute of Plasma Physics at the Chinese Academy of Sciences (ASIPP), where it will be part of the ASIPP test platform that mimics the site configuration at ITER.

Present on 25 October to witness the arrival of the first poloidal field AC/DC converter bridge and external bypass were colleagues from ITER's Coil Power Supply Section and the ASIPP team.

China is responsible for the procurement of all 14 poloidal field converters that will provide controllable current/voltage to ITER's six poloidal field coils. The system is challenging to design and fabricate, in particular due to an unprecedented power level and short circuit current and a highly specific operation mode.

The fabrication contract was awarded by ASIPP at the end of 2011. As a component to be built from scratch—and quite unlike the traditional converters used in industrial applications—it was a challenging task. Thanks to the joint efforts of ASIPP engineers and the manufacturer, following a manufacturing design review in 2012 production and manufacturing went smoothly. The converter bridge and bypass successfully passed routine tests at the factory, as witnessed by Chinese Domestic Agency and ASIPP representatives.

The first converter bridge and bypass, together with another three bridges and some auxiliary systems, will serve as the system prototype. Operational test runs on the ASIPP platform will permit the verification of the units' performance and provide experience and data for future series production.