低环径比（ＬＡＲ）概念作为一种聚变动力堆设计方案，它的许多关键问题已用总体设计程序进行了评估计算。Ａ＝１．４，κ＝３，βＴ＝６２％和自持电流为８７％的平衡设计的物理基础取自过去已得到的结果。计算表明，若引入氪（Ｋｒ）以便增加等离子体芯部辐射，则可将偏滤器上的热流部分地转移到第一壁上，但此时芯部的聚变功率也有所减少。设计中采用了积极的工艺措施，将关键部件的参数推向设计极限，为了减小堆尺寸，对铜合金的环向磁场（ＴＦ）线圈中心柱未施屏蔽。本文提出了一项能承受高的热负荷和中子壁负载的堆设计，它在第一壁和包层中用氦作载热剂、钒合金作结构材料、锂作氚增殖剂。若采用上述材料组合和设计，一个电功率为１９６６ＭＷｅ的聚变动力堆的尺寸，可减小到大半径为３．０５ｍ。设铜合金和钒合金的辐照寿命为１５ＭＷｙ／ｍ２，考虑到在堆的３０年寿期内，须更换铜合金中心柱和外侧第一壁以及包层，估计电价为５．１９美分／千瓦时，而总的直接投资为４８．８亿美元。这说明采用本ＬＡＲ设计，聚变电厂的造价（２４８２美元／千瓦电）开始接近可接受的价格水平，为了获取经济的聚变动力，采用ＬＡＲ发展途径可能是明智之举。 Low Lore Size Ratio (LAR) Concept As a fusion reactor design solution, many of its key issues have been evaluated using the overall design process. The physical basis for a balanced design of A = 1.4, κ = 3, βT = 62%, and self-sustaining current of 87% is taken from the results obtained in the past. Calculations show that if krypton (Kr) is introduced to increase the plasma core radiation, the heat flow on the divertor can be partially transferred to the first wall, but the fusion power at the core is also reduced. The design incorporates proactive process measures that push the parameters of critical components to design limits and, in order to reduce the stack size, no shielding of the copper alloy toroidal magnetic field (TF) coil center post. This paper presents a stack design that can withstand high thermal loads and neutron wall loading. He uses helium as the heating agent in the first wall and cladding, vanadium alloy as the structural material, and lithium as the tritium multiplier. With the combination of materials and design described above, the size of a fusion power reactor with an electric power of 1966 MWe can be reduced to a large radius of 3.05 m. Let copper alloy and vanadium alloy irradiation life of 15MWy / m2, taking into account the 30-year life of the reactor, to be replaced copper alloy center column and the outer first wall and the cladding, the estimated price of 5.19 cents / KWh, while total direct investment was 4.88 billion U.S. dollars. This shows that with this LAR design, the cost of a fusion power plant ($ 2,482 / kWh) started to approach acceptable price levels, and it might be wise to adopt a LAR approach to economic agglomeration.