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Tritium retention and clean-up in JET

P Andrew, P.D Brennan, J.P Coad, J Ehrenberg, R Pearce1999年Fusion Engineering and DesignIF 1.7出版社

AbstractDuring 1997 JET operation with D-T plasmas, 35 g of tritium were introduced into the torus, mainly by gas puffing. It was found that during this period, the torus tritium inventory would accumulate at a rate of about 40% of the input. After tritium operation ceased, the experimental program continued with deuterium- and hydrogen-fuelled experiments, during which time the tritium inventory decreased to about 17% of the total input. Techniques aimed at detritiation of the torus included methods using deuterium gas (such as deuterium pulsing) which were used in the middle of the experimental campaign, and methods which could adversely affect the torus vacuum conditions (such as air purges) which were reserved for the period after the experimental campaign. Whilst it was found that the plasma tritium fraction could be reduced to below the 1% level in a few days, the tritium inventory reached a virtually steady level of about 6 g by the end of the campaign.

日本語訳

1997年のJET運転においてD-Tプラズマを用いた際、主にガス噴射により35gのトリチウムがトーラスに導入された。この期間中、トーラス内のトリチウムインベントリは投入量の約40%の割合で蓄積することが判明した。トリチウム運転終了後、実験プログラムは重水素および水素を用いた実験を継続し、その間にトリチウムインベントリは総投入量の約17%まで減少した。トーラスのトリチウム除去を目的とした技術には、重水素ガスを用いる方法(重水素パルスなど)が含まれ、これらは実験キャンペーンの中盤で使用された。また、トーラスの真空状態に悪影響を及ぼす可能性のある方法(空気パージなど)は、実験キャンペーン終了後の期間に留保された。プラズマ中のトリチウム分率は数日で1%未満に低減できることが判明した一方、トリチウムインベントリはキャンペーン終了時までに約6gのほぼ一定レベルに達した。

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