A mechanism of ion temperature peaking by impurity pellet injection in a heliotron plasma
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抄録
0000-0002-9536-9841
Experiments on the Large Helical Device with the injection of carbon pellets into discharges of low density have demonstrated a significant reduction of the ion heat conduction in the plasma core and an increase in the central ion temperature by a factor of up to 2. These results are interpreted in the framework of a transport model elaborated on the basis of those applied previously to explain the improvement in confinement by impurity seeding into the tokamak devices TEXTOR and JET. The calculations performed reproduce well the strong peaking of the ion temperature profile with increasing carbon density nZ and the consequent drop in the confinement as nZ exceeds a certain critical level. The importance of different elements in the model, such as braking of the main ion rotation by friction with impurity ones and the shape of the density profiles, are investigated. A qualitative assessment of the applicability under fusion reactor conditions, e.g. of much higher plasma density and heating power, is performed.
収録刊行物
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- Plasma Physics and Controlled Fusion
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Plasma Physics and Controlled Fusion 62 (7), 075008-, 2020-06-01
IOP Publishing
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詳細情報 詳細情報について
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- CRID
- 1050009371676343552
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- NII論文ID
- 120007184714
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- NII書誌ID
- AA10643410
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- ISSN
- 07413335
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- HANDLE
- 10655/00012891
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
- CiNii Articles