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Overview of tritium retention in divertor tiles and dust particles from the JET tokamak with the ITER-like wall

Y. Torikai, G. Kikuchi, A. Owada, S. Masuzaki, T. Otsuka, N. Ashikawa, M. Yajima, M. Tokitani, Y. Oya, S.E. Lee2024年Nuclear FusionIF 3出版社

Divertor tiles after Joint European Torus-ITER like wall (JET-ILW) campaigns and dust collected after JET-C and JET-ILW operation were examined by a set of complementary techniques (full combustion and radiography) to determine the total, specific and areal tritium activities, poloidal tritium distribution in the divertor and the presence of that isotope in individual dust particles. In the divertor tiles, the majority of tritium is detected in the surface region and, the areal activities in the ILW divertor are in the 0.5–12 kBq cm−2 range. The activity in the ILW dust is associated mainly with the presence of carbon particles being a legacy from the JET-C operation. The total tritium activities show significant differences between the JET operation with ILW and the earlier phase with the carbon wall (JET-C) indicating that tritium retention has been significantly decreased in the operation with ILW.

日本語訳

ダイバータタイルは、JET-ILW(Joint European Torus-ITER like wall)キャンペーン後、およびJET-CおよびJET-ILW運転後に採取されたダストは、一連の相補的手法(完全燃焼およびラジオグラフィー)によって検査され、全トリチウム放射能、比放射能、面積放射能、ダイバータ内のポロイダル方向のトリチウム分布、および個々のダスト粒子におけるその同位体の存在を決定した。ダイバータタイルでは、トリチウムの大部分が表面領域で検出され、ILWダイバータにおける面積放射能は0.5~12 kBq cm−2の範囲である。ILWダスト中の放射能は、主としてJET-C運転から残存する炭素粒子の存在に関連している。全トリチウム放射能は、ILWを用いたJET運転と、炭素壁(JET-C)を用いた初期段階との間で有意な差を示し、ILWを用いた運転ではトリチウム保持が大幅に減少したことを示している。

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iter高精度(タイトル一致)jet高精度(タイトル一致)

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ITERJETDivertorTritiumITER-like wallDust particles
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