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Author(s):
K. Yamazaki
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Title:
Proposal of "MODULAR HELIOTRON": Advanced Modular Helical System Compatible with Closed Helical Divertor
Date of publication:
Nov. 1993
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Key words:
modular coils, helical system, helical divertor, magnetic surface, heliotron/torsatron, stellarator
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Abstract:
A new modular helical configuration named "Modular Heliotron" with clean and efficient helical magnetic divertor is proposed as an extension of the present conventional design of the continuous helical coil system. The sectored helical coils on one plane of the torus and the sectored returning vertical field coils on the other plane are combined. This coil system produces magnetic surfaces nearly equivalent to those of the l=2 helical system with one-pair poloidal coils, and overcomes the defects of construction and maintenance difficulties of the continuous coil systems. This concept satisfies the compatibility between the coil modularity and the sufficient divertor-space utilization, different from previous modular coil designs. The allowable length of the gap between each modular coil is clarified to keep good magnetic surfaces. Typical examples of the reactor coil configuration are described as an extension of the LHD (Large Helical Device) configuration.
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