The divertor is one of the most crucial components of the fusion reactor used in the tokamak. Its function is to discharge unburned fuel and impurities such as helium (He) in the core plasma generated by the fusion reaction, in order to stably confine the plasma.
The heat load on the divertor reaches a maximum of 20MW/m2. This is equivalent to the surface thermal load on an asteroid probe during re-entry into the atmosphere, and approximately 30 times the surface thermal load on the Space Shuttle. Since the Outer Vertical Target, which directly faces the plasma due to its structure, is used in an extreme environment where it is exposed to the heat load and high energy particle loading from the plasma, and its structure has an extremely complex shape, high-precision fabrication and processing technology is required.
MHI has also received orders for production for five (of a total of 19) toroidal field (TF) coils, another core component of ITER, all of which were shipped by 2023.(4) Going forward, MHI will continue its efforts for manufacturing of major components such as the divertor and equatorial launcher.(5) In addition, MHI will actively support the design and development of the fusion prototype reactor planned to be constructed following the ITER project, contributing to the realization of fusion energy.
(1) Fusion is the energy source that enables the sun to keep shining. The ultimate goal is achieving fusion on Earth. Fusion reactions fuse light atomic nuclei (deuterium and tritium) in a plasma environment into the heavier element of helium. Fusion reactions emit zero carbon dioxide, and their source of fuel can be extracted from seawater in virtually unlimited quantities (lithium from which tritium is derived, and deuterium). Fusion energy is expected to provide fundamental solutions to many of the world's energy and environmental problems.
(2)
(3) For more information on the six units of divertor outer vertical targets that QST ordered from MHI in 2021, see the following press release https://www.mhi.com/news/211213.html
(4) For more information on the TF coils that QST ordered from MHI, see the following press release.https://www.mhi.com/news/210524.html
(5) The equatorial launcher is a device to heat the plasma by injecting high-frequency beams.
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