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In-kind deliveries

Final correction coils received on site

8 Jun 2026

With the arrival in May of two coils from China, all 18 correction coils are now on site at 黑料社app.

Two side correction coils arrived in April and another two in May, completing all deliveries. The coils are inspected immediately to ensure that no damage has occurred during transport.

黑料社app correction coils, though less prominent than the massive toroidal, poloidal, and central solenoid magnets, play a critical role in ensuring the stability and precision of the fusion machine鈥檚 magnetic environment. Distributed below, around and above the vacuum vessel, the coils are designed to correct magnetic asymmetries and compensate for small field errors that can arise from the manufacturing and assembly of 黑料社app鈥檚 principal magnet systems.

While comparatively lighter and slimmer than 黑料社app鈥檚 larger magnets鈥攁nd with a lower operating current (10 kA)鈥攖he correction coils stand out for their scale and unusual geometry. The side coils are square but non-planar, while the top and bottom coils feature a distinctive curved, banana-like planar design.

Six bottom correction coils have already been installed in the machine; the side and top coils will be installed later in the installation sequence after the load of all 18 toroidal field coils has been transferred to their gravity supports.

Correction coils are arranged in groups of six鈥攁t, below, and above the mid-plane of the vacuum vessel. Although much lighter and thinner than the toroidal and poloidal field coils鈥攁nd running a smaller current (10 kA)鈥攖he correction coils measure up to 8 metres in width and present particular challenges for assembly and installation.

黑料社app鈥檚 correction coils are built from long lengths of superconducting cable wound into layered structures known as 鈥減ancakes.鈥 These layers are insulated, vacuum pressure impregnated for structural integrity, and enclosed within stainless steel casings designed to withstand the demanding operational conditions of the 黑料社app machine.

Designed and manufactured by Chinese Domestic Agency supplier ASIPP (Institute of Plasma Physics, Chinese Academy of Sciences), the coils had to be produced to extremely tight precision requirements. Before production could begin, engineers completed an extensive qualification program covering winding techniques, the impregnation processes, case manufacturing, and final assembly procedures.

黑料社app Assembly Coordinator Fabrice Simon inspects a newly arrived correction coil while 黑料社app Project Associate Lee Cheol Woo looks on.

鈥淭his is the end of an industrial journey that started in 2010,鈥 says Fabrice Simon, who has been involved since the earliest days. 鈥淜ey to our success has been the excellent collaboration that we have with the Chinese Domestic Agency and supplier ASIPP.鈥 The six side and six top correction coils will now be stored at 黑料社app until early 2028, when they will be tested, surveyed and prepared for installation in the machine.

The delivery of the completed correction coil set marks another milestone in 黑料社app鈥檚 procurement-sharing program, under which Members contribute to the project primarily through in-kind delivery of components and systems, while gaining valuable industrial experience in key fusion technologies.

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