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Pa(地球の 0.6%)","decision":"真空容器 4 mm・断熱容器 6 mm の外圧に耐える殻。ポンプ 10 台"},{"driver":"熱の捨て方","value":"放射だけ・周り 210 K(風の対流が 16% を助ける)","decision":"放射器 1,117 m²。同じ場所で D-T なら 2,160 m²"},{"driver":"燃料(手に入るもの)","value":"D-D(重水素だけ)","decision":"中性子 11.4 MW → 内側の遮蔽 0.48 m → 中央のコイル半径 1.41 m。端の直接発電器 半径 1.72 m"},{"driver":"遮蔽の材料","value":"レゴリス(月や火星の砂)","decision":"溝に寝かせてレゴリス 3.6 m"},{"driver":"重力","value":"3.71 m/s²","decision":"重さ 62 kN。電磁力はその 65 倍なので、芯の支えは重力でほとんど変わらない"},{"driver":"近くの人","value":"いる","decision":"漏れ磁場 0.5 mT の柵 半径 33 m"}],"cad":{"parts":203,"failed":[],"status":1,"unit":"mm"},"layout":{"z_axis":-2.3759482955795868,"r_reach":1.9759482955795862,"half_len":6.516045745316409,"y_reach":4.672080173231243,"fence_R":33.33502392397134,"trench":[15.032091490632817,11.344160346462486,4.951896591159173],"berm_half_x":7.516045745316409,"y_radiators":16.152432700075458},"changes":[{"what":"真空容器","earth":"28 mm の殻","here":"4 mm の殻","why":"外の気圧が地球の 0.6% なので、外圧に耐える殻は薄くてよい"},{"what":"断熱容器","earth":"41 mm の殻","here":"6 mm の殻","why":"外圧が小さいので薄い殻で足りる"},{"what":"燃料","earth":"D-T(重水素+三重水素)","here":"D-D(重水素だけ)","why":"地下の氷から重水素がとれる(火星の水は重水素が地球の約5倍)。三重水素を増やさずに済む D-D を選ぶ"},{"what":"遮蔽と増殖層","earth":"遮蔽 0.54 m+増殖層 0.25 m","here":"遮蔽 0.48 m","why":"中性子が 11.4 MW(地上は 24 MW)。三重水素を増やす層が要らない"},{"what":"コイル","earth":"中央の半径 1.75 m・端 8.3 MA","here":"中央の半径 1.41 m・端 7.7 MA","why":"遮蔽が薄いぶん、コイルをプラズマに近づけられる。コイル同士の力は 5.5 → 4.1 MN"},{"what":"端","earth":"閉じた端の部屋・発電器 直径 2.0 m・ポンプ 10 台","here":"閉じた端の部屋・発電器 直径 3.4 m・ポンプ 10 台","why":"端へ出てくる荷電粒子のエネルギーが 19 MW(地上は 6 MW)。発電器の大きさは受けられる熱の流れで決まる"},{"what":"炉の長さ","earth":"11.9 m","here":"13.0 m","why":"端の発電器とフィンの大きさで決まる"},{"what":"熱の捨て方","earth":"冷却塔 2 区画","here":"放射器 1,117 m²","why":"熱は放射でしか捨てられない。同じ場所で D-T なら 2,160 m²。薄い大気の風が 16% を助ける"},{"what":"外への遮蔽","earth":"コンクリートの建屋 2.4 m","here":"溝+レゴリス 3.6 m","why":"砂がその場にある。掘って、かぶせる"},{"what":"漏れ磁場の柵","earth":"半径 37 m","here":"半径 33 m","why":"基地の人を守る"},{"what":"重さ","earth":"216 kN(電磁力の 1/26)","here":"62 kN(電磁力の 1/65)","why":"芯の支えを決めるのは電磁力。重力の差は芯の形をほとんど変えない"}],"headline_ja":"容器は残るが、厚さは 4 mm(地上の 1/7)。氷の重水素で D-D を燃やすので、遮蔽は地上と月の間。熱の捨て場に困り、放射器が 1,117 m²(月の 3.4 倍)。炉は 3.6 m の砂の下で、柵と居住区がある。"}