Conceptual design activities and key issues on LHD-type reactor FFHR

Abstract An overview of conceptual design activities on the LHD-type helical reactor FFHR is presented, mainly focusing on optimization studies on the reactor size and the proposal of a long-life blanket. A major radius of around 15 m is the present candidate under the constraints of the energy confinement achieved in LHD, a maximum magnetic field around 13 T with a current density around 30 A/mm2 and a neutron wall loading around 1.5 MW/m2. R&D on super-conducting magnet systems of large scale, high field and high current-density are new challenging targets based on the LHD. The development of new design tools has been started aiming at establishing a virtual power plant (VPP) and a virtual reality system for 3D design assisting. Next design issues are mainly on engineering optimization of the first wall thickness, the detailed 3D blanket system, and unscheduled replacements of breeder blankets.

[1]  Naoki Mizuguchi,et al.  Improved structure and long-life blanket concepts for heliotron reactors , 2005 .

[2]  Kozo Yamazaki,et al.  Pellet injection algorithm for the FFHR helical reactor , 2004 .

[3]  T. Maruyama,et al.  Neutron irradiation effect on the thermal conductivity and dimensional change of graphite materials , 1992 .

[4]  B. T. Kelly,et al.  Irradiation Behavior of Fine-Grain Graphites , 1989 .

[5]  Kozo Yamazaki,et al.  Initial physics achievements of large helical device experiments , 1999 .

[6]  S. Imagawa,et al.  Scale Effects on Magnet Systems of Heliotron-Type Reactors , 2005 .

[7]  Robert W. Conn,et al.  New Concepts for Controlled Fusion Reactor Blanket Design , 1975 .

[8]  Masaki Osakabe,et al.  Properties of thermal decay and radiative collapse of NBI heated plasmas on LHD , 2002 .

[9]  Osamu Motojima,et al.  Blanket and divertor design for force free helical reactor (FFHR) , 1995 .

[10]  Akihiko Shimizu,et al.  Design and development of the Flibe blanket for helical-type fusion reactor FFHR , 2000 .

[11]  Osamu Motojima,et al.  Numerical study of magnetic field configuration for FFHR from a viewpoint of divertor and edge field structure , 2006 .

[12]  Akihiko Shimizu,et al.  Innovative Liquid Breeder Blanket Design Activities in Japan , 2005 .

[13]  Kozo Yamazaki,et al.  Helical Fusion Power Plant Economics Studies , 2005 .

[14]  Naoki Mizuguchi,et al.  Development of reactor design aid tool using virtual reality technology , 2006 .

[15]  Mahmoud Z. Youssef,et al.  Development of three-dimensional neutronics calculation system for design studies on helical reactor FFHR , 2006 .