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-Four of the five TF coils ordered (excluding spare coils) are being shipped to the project site.
-Mitsubishi Heavy Industries (MHI) has the high-tech capabilities of TF coil structure and winding, and has contributed to the development of fusion technology.
May 24, 2021, Tokyo-(JCN Newswire)-Mitsubishi Heavy Industries Co., Ltd. (MHI) has completed the manufacture of four toroidal field (TF) coils (five in total, including a spare coil) ordered by the National Quantum Institute And ITER’s Radiological Science and Technology (QST), an experimental fusion reactor, currently under construction in Saint-Paul-les-Dillance in southern France. The complete TF coil will be shipped from Kobe to the south of France, and will be installed on site organized by ITER, and will begin operation in 2025.
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| Complete unit four |
MHI held a ceremony in its Futami factory in January 2020 to commemorate this achievement, thus completing the world’s first TF coil for ITER. The first coil and second unit were completed in March 2020 and are currently being installed in an experimental reactor in southern France. The third steel coil was completed in November 2020 and has arrived at the site, and the test has been completed.
In order to generate a nuclear fusion reaction in the reactor, it is necessary to maintain the deuterium and tri fuel in a high temperature and high density (plasma) state in a magnetic field. Therefore, the TF coil, which is the core component of ITER, requires high-precision manufacturing to ensure high-precision plasma, and requires a sufficient thickness to withstand a strong magnetic field of tens of thousands of tons. In addition to handling the final assembly process of five coils of all 19 TF coils in ITER, MHI has also manufactured the structures and windings used in TF coils. The height and accuracy of these large superconducting coils are within 0.01%. The height of the guide coil is 16.5 meters wide and 9 meters wide, and the total weight is 300 tons.
In addition to completing the four TF coils for ITER, MHI is also committed to manufacturing other core components, including the splitter (1) 1 and the equatorial EC transmitter (2). Mitsubishi Heavy Industries provides mass production technology for difficult-to-manufacture parts through accumulated knowledge, and actively supports the ITER project to develop technologies that are vital to the stable development of the world. MHI continues to contribute to improving reliability. Fusion technology.
Project Background
The International Thermonuclear Experimental Reactor Project is an international large-scale project that aims to demonstrate the realization of fusion energy in science and technology (3). There are seven parties: Japan, the European Union, the United States, Russia, South Korea, China and India. Construction of ITER is underway in Saint-Paul-les-Durance, France, with a target operating date of 2025. Japan plays an important role in the development and manufacture of ITER’s main components (including TF coils). As the domestic agent of ITER for the ITER project designated by the Japanese government, QST is responsible for purchasing these components.
ITER’s superconducting TF coil is D-shaped, about 16.5m high, 9m wide, and weighing about 300 tons. Eighteen TF coils will surround the container of the vacuum container and generate a strong magnetic field (maximum 12 Tesla) to confine the high-temperature, high-density plasma within the container. The ITER project requires a total of 19 TF coils (including a spare coil). Japan produced 9 units (including spares), and Europe produced 10 units. The inner coil structure of all 19 TF coils will be produced at MHI’s Futami Plant.
Mitsubishi Electric Corporation is responsible for the production of niobium tin (Nb3Sn) superconducting winding sets for five TF coils (including four complete coils). The outboard coil structure is manufactured in Korea, and the final assembly is carried out at the Futami factory.
Significance of the latest achievements
High precision is required, and a strong magnetic field (12 Tesla) confines the plasma inside the ITER. Therefore, it is necessary to develop an ultra-large superconducting coil using niobium-tin conductors. In order to maintain superconductivity, the coil must be able to work at a low temperature of minus 269°C, which requires the development of special stainless steel structural materials that can withstand this low temperature and all the necessary manufacturing technologies. Not only is there no precedent for a coil of this size, but the dimensional tolerance of the winding and the coil requires high precision within 0.01%.
QST began to develop TF coil manufacturing technology in 2005, and MHI began manufacturing in 2012. QST and MHI collaborated to develop high-precision technology for winding niobium-tin conductors, and also developed a durable structural material made of special stainless steel that can withstand low temperatures.
In addition, in order to determine the conditions for suppressing welding deformation, parameter tests were carried out, and the welds were verified using micro and large specimens, which laid the foundation for the basic technology (including advanced welding processes and welding processes) suitable for the properties of the material. basis. Processing Technology. In the end, Mitsubishi Heavy Industries was able to meet the stringent requirements of ITER.
Future schedule
Mitsubishi Heavy Industries plans to complete the manufacturing of the remaining TF coils (spare coils) of all five coils in 2022.
(1) A device that removes impurities in the core plasma and suppresses high heat load and particle load.
(2) Equipment that injects high-frequency electromagnetic waves to heat the plasma.
(3) Fusion is an energy source that makes sunlight continue to shine. The ultimate goal is to achieve the integration of the earth. The fusion reaction fuses the light nuclei (deuterium and tri) in the plasma environment into the heavier helium element. The fusion reaction emits zero carbon dioxide, and its fuel source can be extracted almost infinitely from seawater (lithium is the source of (and tri is extracted from deuterium). Fusion energy is expected to provide the foundation for many energy and environmental problems in the world s solution.
About Mitsubishi Heavy Industries
Mitsubishi Heavy Industries (MHI) Group is one of the world’s leading industrial groups, with businesses covering energy, logistics and infrastructure, industrial machinery, aerospace and defense. Mitsubishi Heavy Industries Group combines cutting-edge technology with rich experience to provide innovative integrated solutions to help realize a carbon-neutral world, improve the quality of life and ensure world safety.For more information, please visit www.mhi.com Or follow our insights and stories www.spectra.mhi.com.
Source: Mitsubishi Heavy Industries Co., Ltd.
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