Abstract
In helical experiment devices, the accuracy of their nonplanar coils affects plasma confinement properties significantly; so coil winding accuracy is one of the crucial issues for their construction. An advanced method for helical coil windings in fusion devices was studied. This new method utilizes a geometrical characteristic of the trajectory of the helical coil, which enables us to improve the accuracy of coils, and is thus expected to improve the mechanical, electromagnetic and super-conducting properties of the coils. This paper presents the new concept of the winding method and practically shows the results of the R&D for the Large Helical Device (LHD). 8 refs., 7 figs.
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