Publication

Laser-aided diagnostics of JT-60SA

Stefano Coda, Stephan Brunner
2025

Abstract

JT-60SA is currently the world's largest superconducting tokamak. It accelerates the realization of fusion energy by supporting ITER exploitation and complementing it in addressing key physics and engineering issues for DEMO reactors. The main targets of JT-60SA are breakeven-equivalent high-temperature deuterium plasmas and high-βsteady-state plasmas. To achieve these goals, laser-aided diagnostics with high spatial resolution are essential for detailed physics studies. In Operation Phase 1, a tangential single-chord two-color CO2laser interferometer was installed. The data acquisition and processing system featured fringe-jump detection and real-time processing, enabling density feedback control. In the upcoming operational phases, a CO2laser polarimeter and Thomson scattering diagnostics will be implemented in Operation Phase 2, followed by the installation of phase-contrast imaging in Operation Phase 3. This paper summarizes the measurement results from the first operational phase and outlines the design and current status of the other three diagnostics.

Official source

https://infoscience.epfl.ch/entities/publication/5b0bfd53-7a76-47f5-931e-b512f7079a00

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Stefano Coda, Stephan Brunner
2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5b0bfd53-7a76-47f5-931e-b512f7079a00

About this result

Related concepts (23)

Tokamak

A tokamak (ˈtoʊkəmæk; токамáк) is a device which uses a powerful magnetic field to confine plasma in the shape of a torus. The tokamak is one of several types of magnetic confinement devices being developed to produce controlled thermonuclear fusion power. , it was the leading candidate for a practical fusion reactor. Tokamaks were initially conceptualized in the 1950s by Soviet physicists Igor Tamm and Andrei Sakharov, inspired by a letter by Oleg Lavrentiev. The first working tokamak was attributed to the work of Natan Yavlinsky on the T-1 in 1958.

Fusion power

Fusion power is a proposed form of power generation that would generate electricity by using heat from nuclear fusion reactions. In a fusion process, two lighter atomic nuclei combine to form a heavier nucleus, while releasing energy. Devices designed to harness this energy are known as fusion reactors. Research into fusion reactors began in the 1940s, but as of 2023, no device has reached net power. Fusion processes require fuel and a confined environment with sufficient temperature, pressure, and confinement time to create a plasma in which fusion can occur.

Phase-contrast imaging

Phase-contrast imaging is a method of that has a range of different applications. It measures differences in the refractive index of different materials to differentiate between structures under analysis. In conventional light microscopy, phase contrast can be employed to distinguish between structures of similar transparency, and to examine crystals on the basis of their double refraction. This has uses in biological, medical and geological science.

Related publications (12)

Laser-aided diagnostics of JT-60SA

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