In the ST reactor, the radial build of TF coil and the shield play a key role in determining the size of a reactor. For self-consistent determination of these components and physics parameters, a system analysis code is coupled with the onedimensional radiation transport code. Conceptual design of a compact superconducting ST reactor with aspect ratio of less than 2 was conducted and it is shown that the ST reactor with outboard blanket only can provide tritium selfsufficiency by using an inboard neutron reflector instead of breeding blanket. With the use of an improved shielding material and high temperature superconducting magnets with high critical current density open up the possibility of a fusion power plant with compact size and smaller auxiliary heating power simultaneously at low aspect ratio.
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