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- Hesslow, Linnea,1993Chalmers tekniska högskola,Chalmers University of Technology (author)
Influence of massive material injection on avalanche runaway generation during tokamak disruptions
- Article/chapterEnglish2019
Publisher, publication year, extent ...
- 2019-06-26
- IOP Publishing,2019
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- LIBRIS-ID:oai:research.chalmers.se:22b83015-27a8-46e3-b236-f3614f8d9f9b
- https://research.chalmers.se/publication/512941URI
- https://research.chalmers.se/publication/511218URI
- https://doi.org/10.1088/1741-4326/ab26c2DOI
- https://research.chalmers.se/publication/511216URI
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- Language:English
- Summary in:English
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- In high-current tokamak devices such as ITER, a runaway avalanche can cause a large amplification of a seed electron population. We show that disruption mitigation by impurity injection may significantly increase the runaway avalanche growth rate in such devices. This effect originates from the increased number of target electrons available for the avalanche process in weakly ionized plasmas, which is only partially compensated by the increased friction force on fast electrons. We derive an expression for the avalanche growth rate in partially ionized plasmas and investigate the effects of impurity injection on the avalanche multiplication factor and on the final runaway current for ITER-like parameters. For impurity densities relevant for disruption mitigation, the maximum amplification of a runaway seed can be increased by tens of orders of magnitude compared to previous predictions. This motivates careful studies to determine the required densities and impurity species to obtain tolerable current quench parameters, as well as more detailed modeling of the runaway dynamics including transport effects.
Subject headings and genre
- NATURVETENSKAP Fysik Fusion, plasma och rymdfysik hsv//swe
- NATURAL SCIENCES Physical Sciences Fusion, Plasma and Space Physics hsv//eng
- tokamak
- disruption
- runaway electron
- runaway avalanche
Added entries (persons, corporate bodies, meetings, titles ...)
- Embréus, Ola,1991Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)embreus (author)
- Vallhagen, Oskar,1997Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)vaoskar (author)
- Fülöp, Tünde,1970Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)tunde (author)
- Chalmers tekniska högskola (creator_code:org_t)
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- In:Nuclear Fusion: IOP Publishing59:81741-43260029-5515
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