What’s New

This heart-shaped dust particle was captured by ion microbam scan on a divertor tile in the JET tokamak.  

A team of researchers from the Croatian Fusion Research Unit—Stjepko Fazinić, Ivan Sudić and Tonči Tadić (Ruđer Bošković Institute)—in cooperation with their colleague Per Petersson from the KTH Royal Institute of Technology in Sweden "caught" a fusion heart during an experiment at JET in December 2015.

Measuring 100 by 120 micrometres, the dust particle is made mainly of tungsten, nickel, chromium, molybdenum and iron, with traces of beryllium, aluminium, copper and sodium.

The Joint European Torus is currently the world's largest operational magnetic confinement plasma physics experiment, located at the Culham Centre for Fusion Energy in Oxfordshire, UK. As a joint venture, JET is collectively used by more than 40 European laboratories. The European Consortium for the Development of Fusion Energy EUROfusion provides the work platform to exploit JET in an efficient and focused way. As a consequence more than 350 scientists and engineers from all over Europe currently contribute to the JET program.

Read the original story on the Ruđer Bošković Institute website.

As work on the foundations of the ITER cryoplant advances on site, industrial partners around the world are making progress on the different manufactured elements of what will be the largest concentrated cryogenic system in the world.

The ITER cryoplant is composed of helium and nitrogen refrigerators combined with a 80 K helium loop. Three helium refrigerators supply the required cooling power via an interconnection box providing the interface to the cryodistribution system; two nitrogen refrigerators provide cooling power for the thermal shields and the 80 K pre-cooling of the helium refrigerators. The ITER cryogenic system will be capable of providing cooling power at three different temperature levels: 4 K, 50K and 80K.

The cryoplant is also a wide international collaboration, with Europe procuring the Liquid Nitrogen Facility (LN2) and auxiliary systems, India procuring the interconnecting lines and cryodistribution equipment, and the ITER Organization directly procuring the Liquid Helium (LHe) plant.

Under contract to Air Liquide Global E&C Solutions France, chosen by the European Domestic Agency to manufacture the LN2 plant, the Indian company Flowserve has produced six valves that will control the helium flow from the 80K loop boxes to the thermal shields and cryopumps of the ITER machine. These valves are nearly five times bigger than the average cryogenic valve found on a standard helium liquefier, measuring 2.5 metres in height and weighing more than 1.5 metric tons. Maximum flow-through attains 4.4 kg/second, more than twice what is normally released through a helium valve in even the biggest helium liquefiers. 

The ITER Organization coordinated the inspection of the valves, which are now on their way to China to be assembled with other equipment.

Read the original story on the European Domestic Agency website.

The European Commission had established a panel of independent high-level experts to evaluate the Euratom research program comprising fission and fusion research. The findings, which were recently published, are more than a pat on the back for Europe's fusion research activities, especially with regard to EUROfusion's flagship device the Joint European Torus (JET) and the Roadmap to the realisation of fusion energy.

The panel's findings place JET firmly at the heart of Europe's fusion research activities and underline its role as the device that is crucial to the developments at ITER. JET is currently the largest operating tokamak in Europe and also the only machine that is capable of carrying out experiments using the deuterium-tritium (D-T) fuel. And because D-T is the fuel of choice for a fusion reactor, results from the upcoming D-T experiments in JET will provide the know-how pertinent to ITER experiments. In addition, JET's ITER-like plasma-facing wall, its tungsten divertors, and its highly sophisticated remote-handling systems are all features that will lend invaluable knowledge and experience relevant to ITER.

Another facet the panel recognized as important is the European Fusion Roadmap which looks to steer the fusion program from being solely laboratory-based and science-driven to include industry and technology in its fold. The roadmap, which has been put together with inputs from all the EUROfusion consortium members, looks to solidify collaboration with industry in areas ranging from standardization of parts to plant design and integration and materials development. Also featuring prominently in the Fusion Roadmap is the role of JET as the testing ground for ITER operation— an aspect that is completely aligned with the panel's findings.

The independent panel's evaluation strongly backs this endorsement stating that "the decision to extend the use of JET to support the development of ITER was not only correct but essential." It further goes on to say that "high priority should be given to keeping JET operating until the design for ITER has been finalized and ITER has been successfully commissioned."

Read the original story at EUROfusion.