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Results of ITER DMS pellet material (neon) injection into Large Helical Device
https://repo.qst.go.jp/records/83903
https://repo.qst.go.jp/records/839035d36ea38-e68a-4f94-9584-75a5d9059bec
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-11-25 | |||||
| タイトル | ||||||
| タイトル | Results of ITER DMS pellet material (neon) injection into Large Helical Device | |||||
| 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 |
Akinobu, Matsuyama
× Akinobu, Matsuyama× Ryuichi, Sakamoto× Akinobu, Matsuyama |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | ITER Disruption Mitigation System (DMS) will inject a small quantity of neon and a large quantity of hydrogen by means of shattered pellet injection (SPI) technology. Finding optimal pellet composition is a most urgent item of required R&D in existing fusion facilities to support the ITER Research Plan (IRP). However, injecting a large-size impurity pellet often triggers macroscopic instabilities and the associated global radiation, which might not be accommodate for accurate measurement of the ablation and assimilation process. To fill this gap, the pellet ablation experiment was carried out in Large Helical Device (LHD). The size of each fragment delivered with SPI is comparable to those used in fueling (Φ=3 mm) in LHD and the disruption-free characteristics of LHD allows one to observe ablation clouds with spatiotemporal resolution. This paper will present results of pure neon pellet injection in the 2019 campaign. It was observed that the penetration depth of a neon pellet is shallower and the expansion speed of ablated material along the magnetic field is significantly slower than those of equivalent-size hydrogen pellet. The results are compared with neutral-gas and plasma shielding (NGPS) model prediction. Differences to hydrogen pellet ablation are interpreted regarding the material and radiation properties and hydrodynamics of neon pellet ablation. | |||||
| 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 | The 30th International Toki Conference on Plasma and Fusion Research | |||||
| 発表年月日 | ||||||
| 日付 | 2021-11-19 | |||||
| 日付タイプ | Issued | |||||
