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At the Korea Institute of Fusion Energy (KFE), the KSTAR tokamak recommenced operations in December after a major upgrade to replace the device's carbon divertor with a tungsten divertor.

According to an  on the KFE website, the original carbon divertors could take a thermal load of 5MW/m?, whereas the tungsten divertor can take 10MW/m?. The upgrade is critical to the goal of sustaining a 100-million-degree plasma for 300 seconds by 2026. Data from the operational campaign will be directly relevant to ITER, which will operate a tungsten divertor under similar plasma conditions in terms of shape and structure.

This testing campaign will continue through February 2024. Read more about the plans in this  in English on the KFE website, or in Korean in the .

From a UKAEA  on 20 December 2023.

Some 40 and a half years after its first pulse on 25 June 1983, JET delivered pulse number 105,842 on Tuesday 18 December 2023.

UKAEA Chief Executive Officer, Prof Sir Ian Chapman, who was in attendance in JET's control room for the final plasma experiment, said: "This is the final milestone in JET's 40-year history. Those decades of research using JET by dedicated teams of scientists and engineers have played a critical role in accelerating the development of fusion energy."

JET's final day of plasma continued to push scientific boundaries, firstly attempting an inverted plasma shape for the first time at Culham before deliberately aiming electrons at the inner wall to improve understanding of beam control and damage mechanisms. The findings of these experiments will support the development of ITER.

JET will now move on to the next phase of its life cycle in early 2024 for repurposing and decommissioning, which will last until approximately 2040.

JET was operated at the Culham Centre for Fusion Energy as a Joint Undertaking of the European Community between 1977 and 2000, with the Euratom Research and Training program contributing approximately 80 percent of JET operation costs through 2021. Under the operation of the United Kingdom Atomic Energy Authority (UKAEA) since 2000, JET was used by 4,800  consortium experts, students and staff from across Europe.

--The JET control room on the day of final plasma experiments. Photo: UKAEA/EUROfusion