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Engineering Design Study of Quasi-Axisymmetric Stellarator with Low Aspect Ratio

Keisuke Matsuoka, Shoichi Okamura, Shin Nishimura, Mitsutaka Isobe, Chihiro Suzuki, Akihiro Shimizu, Nobuo Tanaka, Mitsuru Hasegawa, Hideji Naito, Kazuhiro Urata, Yutaka Suzuki, Tadanori Tsukamoto

Fusion Science and Technology / Volume 46 / Number 2 / September 2004 / Pages 378-387

Technical Papers / Stellarators /

The engineering design of the quasi-axisymmetric stellarator CHS-qa is described, having a toroidal period number of 2, major radius of 1.5 m, and plasma aspect ratio of 3.2. Although the entire structure of the machine is highly nonaxisymmetric and deformative, the following major engineering concerns for the modular coils and the vacuum vessel have been resolved: (a) modular coil design (curvature and twist of conductors), (b) supporting structures for modular coils, (c) errors due to electromagnetic forces and misalignment in manufacturing processes (analysis shows that the magnetic surface is robust against such disturbances), (d) construction procedure for vacuum vessel and modular coils, and (e) ports for heating and diagnostics.

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