Mitigation of divertor heat flux by high-frequency ELM pacing with non-fuel pellet injection in DIII-D
| Autor: | T.H. Osborne, A. Nagy, Larry R. Baylor, Nicolas Jc Commaux, Robert Lunsford, R. Maingi, Raffi Nazikian, A. L. Roquemore, D.K. Mansfield, Daisuke Shiraki, Alessandro Bortolon, C.J. Lasnier, G.L. Jackson, M.J. Makowski |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Nuclear and High Energy Physics
Toroid Materials science DIII-D Field line Materials Science (miscellaneous) Divertor Granule (cell biology) Pellets Mechanics 01 natural sciences lcsh:TK9001-9401 010305 fluids & plasmas Pedestal Nuclear Energy and Engineering Heat flux 0103 physical sciences lcsh:Nuclear engineering. Atomic power Atomic physics 010306 general physics |
| Zdroj: | Nuclear Materials and Energy, Vol 12, Iss, Pp 1030-1036 (2017) |
| ISSN: | 2352-1791 |
| Popis: | Experiments have been conducted on DIII-D investigating high repetition rate injection of non-fuel pellets as a tool for pacing Edge Localized Modes (ELMs) and mitigating their transient divertor heat loads. Effective ELM pacing was obtained with injection of Li granules in different H-mode scenarios, at frequencies 3–5 times larger than the natural ELM frequency, with subsequent reduction of strike-point heat flux (Bortolon et al., Nucl. Fus., 56, 056008, 2016). However, in scenarios with high pedestal density (∼6 × 1019 m−3), the magnitude of granule triggered ELMs shows a broad distribution, in terms of stored energy loss and peak heat flux, challenging the effectiveness of ELM mitigation. Furthermore, transient heat-flux deposition correlated with granule injections was observed far from the strike-points. Field line tracing suggest this phenomenon to be consistent with particle loss into the mid-plane far scrape-off layer, at toroidal location of the granule injection. |
| Databáze: | OpenAIRE |
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