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純水の高温領域における抵抗率変化特性の測定

Measurement of pure water resistivity in a high temperature region

山中 晴彦; 前島 哲也; 照沼 勇斗; 渡邊 和弘; 柏木 美恵子; 花田 磨砂也

Yamanaka, Haruhiko; Maejima, Tetsuya; Terunuma, Yuto; Watanabe, Kazuhiro; Kashiwagi, Mieko; Hanada, Masaya

国際熱核融合実験炉の中核加熱装置である中性粒子入射装置で使用する25$$^{circ}$$Cから高温領域の180$$^{circ}$$Cまでの温度範囲における純水の抵抗率を測定した。抵抗率は温度とともに減少するが、100$$^{circ}$$C以上では、純度が異なる9M$$Omega$$・cmの純水と5M$$Omega$$・cmの純水でもほぼ同じ値で低下することが分かった。180$$^{circ}$$Cにおける抵抗率は0.36M$$Omega$$・cmであり、この値は理論純水の計算値と良い一致を示すことを確認した。

Resistivity of a high temperature pure water has been measured up to 180$$^{circ}$$C which is the maximum water temperature in the ITER Neutral Beam Injector. The resistivity of the pure water is decreased by increasing the water temperature. It was found that even different resistivity water of 9 M$$Omega$$cm and 5 M$$Omega$$cm showed almost the same resistivity at the higher temperature region of 100$$^{circ}$$C. The resistivity of 0.36 M$$Omega$$cm was measured at the temperature of 180$$^{circ}$$C. This resistivity agreed well to the calculated value for the theoretical pure water.

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