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Conceptual design study of pellet fuelling system for DEMO
https://repo.qst.go.jp/records/72209
https://repo.qst.go.jp/records/722090ba93d8a-3c38-41e2-b977-c4a9fff827eb
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-03-17 | |||||
| タイトル | ||||||
| タイトル | Conceptual design study of pellet fuelling system for DEMO | |||||
| 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 |
徳永, 晋介
× 徳永, 晋介× 松山, 顕之× 染谷, 洋二× 宇藤, 裕康× 坂本, 宜照× 朝倉, 伸幸× 飛田, 健次× 徳永 晋介× 松山 顕之× 染谷 洋二× 宇藤 裕康× 坂本 宜照× 朝倉 伸幸× 飛田 健次 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Controllability of output power is one of the essential requirements for DEMO. Fuel control is expected as primary knob for the fusion power control. Pellet injection is considered as primary fueling technique in DEMO as with the ITER. Difference of requirement for fueling system in DEMO compared to ITER comes from demand of larger output. It consequences requirement of more fueling efficiency to obtain higher fuel density as well as sufficient purity under the conditions of density limit against to the larger He ash generation. The fueling efficiency depends on pellet deposition profile. Because of high edge temperature, pellet ablation beyond the pedestal top is hopeless in DEMO. According to an output control simulation study with 1.5D transport code with pedestal suggests the fuel deposition profile peak preferably reaches at least r/a ̃ 0.85. Thus, the plasmoid drift must be utilized to achieve the expected deposition depth. Because the pellet cloud drifts down the gradient of toroidal magnetic field in the positive R-direction, the Z-coordinate of injected point must locate in-between upper and lower edge of targeted flux tube. In order to translate such requirements of the fuel deposition into engineering requirement specification of pellet injection system, we have investigated injection angle, speed and mass dependence of pellet deposition using a pellet ablation-drift code against to the profiles with pedestal. As the result of scan survey, pellet speed ̃2000 m/s and poloidal angle >120 degrees at plasma surface are suggested as a rough estimation for DEMO R&D target. Since the pellet speed is limited by curvature of pellet guide tube (PGT), reconciliation among the PGT route with small curvature, location of coils and demand of neutron shielding arises as an engineering challenge. Optimization study of PGT route design and impact on neutron fluence on vacuum vessel will be presented. | |||||
| 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 | 29th Symposium on Fusion Technology | |||||
| 発表年月日 | ||||||
| 日付 | 2016-09-05 | |||||
| 日付タイプ | Issued | |||||
