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Physics of Plasmas (American Institute of Physics) has published a paper on research carried out under a collaboration between the Eindhoven Technical University (TU/e, Netherlands) and the ITER Organization.

"Kinetic modeling of ELM-induced tungsten transport in a tokamak plasma" (D. C. van Vugt, G. T. A. Huijsmans, M. Hoelzl, A. Loarte, et al) describes the role of edge-localized modes (ELMs) in exhausting tungsten impurities from the core plasma of tokamaks to ensure that their concentration remains low.

The collaboration modelled tungsten impurity behaviour and power fluxes to plasma-facing components during controlled ELMs in ITER with advanced modelling by the JOREK code, which required specific upgrades to the code to include the necessary plasma-wall interaction and impurity transport processes.

The authors write: "This publication shows that the role of ELMs in cleaning up the plasma from tungsten eroded at the divertor in ITER can be opposite to that in present experiments, particularly when we approach the conditions required for high fusion energy production gain. This implies that the use of the ELM control coils, included in the ITER baseline design to modify ELM behaviour and eventually suppress ELMs, will be required not only for the control of power fluxes to the divertor but also to exhaust the eroded tungsten from the confined plasma to keep it clean."

Read the complete article on the TU/e website here.

In his time at DIFFER (the Dutch Institute for Fundamental Energy Research) and the Swiss Plasma Center, fusion researcher Wouter Vijvers developed a novel imaging diagnostic known as MANTIS (Multispectral Advanced Narrowband Tokamak Imaging System).

Today, as CEO of the fusion spin-off Chromodynamics, he is hoping to use his real-time imaging technique in applications such as medical diagnosis and industrial quality and process control.

Imagine if a surgeon removing a malignant tumour from a patient could precisely see the contours of the tumour while operating. "Healthy tissues and malignant tissues have different chemical profiles, and this difference is what multispectral imaging will be able to capture and show," he explains. "Combine that with real-time capabilities, and a surgeon could see the image of the malignant tissue while operating to ensure complete removal."

In the meantime, Vijvers is still using his technology to study the plasma edge. In a Cooperation Agreement signed in February with the ITER Organization, Chromodynamics is joining Dutch research institutes TNO and DIFFER as well as Active Space Technologies (Europe) to develop a diagnostic tool capable of measuring the impurity content of the plasma.

See the full article on the EUROfusion website.

Lithium, the light silvery metal used in everything from pharmaceutical applications to the batteries that power your smartphone or electric car, could also help harness fusion energy on Earth. Lithium can maintain the heat and protect the tokamak vessel walls, and it will be used to produce tritium, the hydrogen isotope that will combine with deuterium to fuel fusion.

At the Princeton Plasma Physics Laboratory (PPPL) in the US, researchers have completed a three-year upgrade of the Lithium Tokamak Experiment, now called the Lithium Tokamak Experiment-Beta. This unique device will be able to test the ability of lithium to maintain the heat and protect the walls of the tokamak.

Photo: Interior view of the Lithium Tokamak Experiment prior to the upgrade.

See plans for the machine on the PPPL website.