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Author(s):
K. Yamazaki, A. Sagara, O. Motojima, M. Fujiwara, T. Amano, H. Chikaraishi, S. Imagawa, T. Muroga, N. Noda, N. Ohyabu, T. Satow, J.F. Wang, K.Y. Watanabe, J. Yamamoto, H. Yamanishi, A. Kohyama, H. Matsui, O. Mitarai, T. Noda, A.A. Shishkin, S. Tanaka and T. Terai
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Title:
Design Assessment of Heliotron Reactor
Date of publication:
Sep. 1996
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Key words:
helical system, heliotron reactor, modular coil, force-free coil, system optimization, cost assessment, blanket design
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Abstract:
DESIGN ASSESSMENT OF HELIOTRON REACTOR Helical reactor designs are studied based on the physics and engineering concept of the Large Helical Device (LHD) which is characterized by two advantages; efficient closed helical divertor and simplified continuous-coil system. Firstly, optimization studies of l =2 conventional LHD-type Reactors (LHD-R) have been carried out. One-point plasma modelling in addition to 3D-quilibrium/ 1D-transport analysis clarified the D-T ignition condition. An accessible design window for reactor parameters is found using physics and engineering constraints. The cost estimation suggests the importance of the compact design to reduce the cost of electricity. Secondly, a new reactor design candidate. Modular Heliotron Reactor (MHR) is proposed focusing on the advantage of efficient helical divertor compatible with modular helical coil system. The special coil winding system permits the appropriate coil gap for reactor module maintenance, and leads to the compatibility between the good plasma confinement and the efficient helical divertor configuration. Two MHR design options are selected based on the LHD-R system analysis. Thirdly, based on the advantage of the simplified continuous-coil design, a highfield Force-Free Helical Reactor (FFHR), is proposed for the reduction of the electromagnetic force by adopting l =3 force-free-like continuous-coil system. The moltensalt FLiBe, LiF-BeF_2, is selected in FFHR as the self-cooling tritium breeder from the view-point of safety and the compatibility with the high magnetic field design.
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