Ionut Jepu

UK Fusion Materials Roadmap 2.0

Amy S. Gandy, Susannah C. Speller, J.S. Gibson, Evans B et autres

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In Situ Chemical Characterization by Laser-Induced Breakdown Spectroscopy of a HFGC Tile from the JET Divertor Through In-Depth Chemical Analysis and Linear Correlation

S. Almaviva, Lidia Baiamonte, Jari Likonen, Antti Hakola et autres

At the end of its last experimental campaign, in December 2023, the Joint European Torus (JET) became available for testing a compact and lightweight Laser-Induced Breakdown Spectroscopy (LIBS) system to be mounted on its robotic arm. The purpose of the test was …

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Corrigendum to “First demonstration of laser induced breakdown spectroscopy using remote handling for in-vessel analysis of tritiated and activated JET components”. [Nucl. Mater. Energy 45 (2025) 102021]

Jari Likonen, S. Almaviva, R. Rayaprolu, Rongxing Yi et autres

The Roadmap for runaway electron-induced plasma facing component damage in tokamaks

S. Ratynskaia, M. Hoelzl, Eric Nardon, P. Aleynikov et autres

Abstract This Roadmap article addresses the critical and multifaceted challenge of plasma-facing component (PFC) damage caused by runaway electrons (REs) in tokamaks, a phenomenon that poses a significant threat to the viability and longevity of future fusion reactors such as ITER and …

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First Demonstration of laser induced breakdown spectroscopy using remote handling for in-vessel analysis of JET components

Jari Likonen, S. Almaviva, R. Rayaprolu, Rongxing Yi et autres

• Feasibility of LIBS for measuring fuel retention was demonstrated in JET using a remote handling system. • A novel LIBS system was developed at ENEA and optimised by Forschungszentrum Jülich. • 840 different spatial locations on the main wall and divertor …

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In-vessel and depth-resolved semi-quantitative analysis on hydrogen isotopes and wall materials in JET by LIBS operated on a remote handling arm

Rongxing Yi, R. Rayaprolu, Jari Likonen, S. Almaviva et autres

• Demonstrates first in-vessel LIBS with remote handling on a D-T exposed fusion device. • Provides semi-quantitative D retention result and D/(D + H) ratio via in-vessel LIBS. • Achieves 0.07 at% detection limit for H isotopes in tungsten using LIBS. • …

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Overview of fuel retention and recovery in JET deuterium–tritium operation

A. Widdowson, S. Brezinsek, Timo Dittmar, D. Douai et autres

Abstract Tritium inventory build-up is a safety and economic issue for next step fusion devices and power plants. JET with a beryllium wall and tungsten divertor brings a unique contribution on fuel retention and recovery in a metallic device, as it has …

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Demonstration of Super-X divertor exhaust control for transient heat load management in compact fusion reactors

B. Kool, K. Verhaegh, Gijs Lukas Derks, J.T.W. Koenders et autres

Abstract Nuclear fusion could offer clean, abundant energy. However, managing the power exhausted from the core fusion plasma towards the reactor wall remains a major challenge. This is compounded in emerging compact reactor designs promising more cost-effective pathways towards commercial fusion energy. …

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Operational challenges for long pulses on JET-ILW

D. King, E. Lerche, X. Litaudon, S. Brezinsek et autres

Abstract The typical pulse on the JET tokamak is ∼10 s during the main phase of the discharge, however long discharge operation (>30 s) is possible with sufficient preparation and care. During the last period of JET operation in 2023 long pulses …

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Preparing LIBS for in-situ measurements in JET tokamak: system overview and co-deposited layer thicknesses

Jasper Ristkok, S. Almaviva, Jari Likonen, J. Karhunen et autres

Laser-induced breakdown spectroscopy (LIBS) is a method for elemental composition analysis that has been proposed for fusion reactor safety diagnostics. A significant milestone in this development was the LIBS campaign conducted in 2024 at the Joint European Torus (JET), using a prototype …

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Runaway electron-induced plasma facing component damage in tokamaks

S. Ratynskaia, M. Hoelzl, E. Nardon, P. Aleynikov et autres

This Roadmap article addresses the critical and multifaceted challenge of plasma-facing component (PFC) damage caused by runaway electrons (REs) in tokamaks, a phenomenon that poses a significant threat to the viability and longevity of future fusion reactors such as ITER and DEMO. …

Overview of the third JET deuterium-tritium campaign

A. Kappatou, M. Baruzzo, Antti Hakola, E. Joffrin et autres

Abstract JET returned to deuterium-tritium operations in 2023 (DTE3 campaign), approximately two years after DTE2. DTE3 was designed as an extension of JET’s 2022-2023 deuterium campaigns, which focused on developing scenarios for ITER and DEMO, integrating in-depth physics understanding and control schemes. …

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