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Observations of tritium inventory in JET-ILW dust particles and applications to metal wall fusion devices
https://repo.qst.go.jp/records/79429
https://repo.qst.go.jp/records/7942930762b06-24e3-4cca-9a21-86b6997f23b8
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-03-13 | |||||
| タイトル | ||||||
| タイトル | Observations of tritium inventory in JET-ILW dust particles and applications to metal wall fusion devices | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Ashikawa, Naoko
× Ashikawa, Naoko× Otsuka, Teppei× Torikai, Yuji× Asakura, Nobuyuki× M. Widdowson, Anna× Rubel, Marek× Oyaizu, Makoto× Masuzaki, Suguru× Isobe, Kanetsugu× Hatano, Yuji× Jachmich, Stefan× Hayashi, Takumi× Asakura, Nobuyuki× Oyaizu, Makoto× Isobe, Kanetsugu× Hayashi, Takumi |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Understandings of tritium inventory in plasma facing materials are important issues for safe maintenances and a control of fueling gasses in ITER and DEMO. Since dust particles are a floating substance, it is also important to consider a protection of radioactive material diffused from inside of the plasma vacuum vessel. A technical establishment for measuring tritium contained in dust particles was a long-term issue, and it was not resolved also in the case of D - T plasma operations in JET and TFTR. The ITER-Like Wall (JET-ILW) experiment as a real simulation of plasma facing materials towards ITER was started from 2011 in JET. The first campaign of the JET-ILW (ILW-1) operation 2011-2012 was followed by the retrieval of selected in-vessel materials for detailed ex-situ studies. Analyses of tritium amounts were done in QST, Rokkasho, Japan. At present, three kinds of methods, the combustion method for a quantitative total tritium measurement, the liquid scintillation counter method for simplified measurement of total tritium amount, and tritium imaging plate technique for tritium spatial distribution measurement, are available for dust particles. Specific tritium activities of dust particles in ILW-1 show similar amounts from a comparison with dust particles collected at the JET carbon wall campaign in 2007-2009. In the ILW-1 campaign, carbon dust particle remained, and TIP observation shows higher tritium inventory on carbon dust particles. In the 3rd ILW (ILW-3) campaign in 2014-2015, tritium amounts in dust particles were measured by the combustion method and specific tritium activity of 30-50 MBq/g was observed. This tritium amount in ILW-3 is one order of magnitude lower than the tritium amount about 700 MBq/g in ILW-1. From an energy dispersive X-ray spectroscopy (EDX) analysis on dust particles in ILW-3, number of carbon particles tends to decrease, compared with results in ILW-1 |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 12 th International Conference on Tritium Science & Technology | |||||
| 発表年月日 | ||||||
| 日付 | 2019-04-22 | |||||
| 日付タイプ | Issued | |||||
