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Divertor Detachment with Multi-Species Impurity Seeding in LHD

Authors :
Byron J. Peterson
Suguru Masuzaki
Kiyofumi Mukai
Chihiro Suzuki
Masahiro Kobayashi
T. Oishi
Hirohiko Tanaka
Yuki Hayashi
Source :
Plasma and Fusion Research. 15:1402051
Publication Year :
2020
Publisher :
The Japan Society of Plasma Science and Nuclear Fusion Research, 2020.

Abstract

Divertor detachment using higher-Z (Kr) and/or lower-Z (Ne) is investigated. Using Kr+Ne superimposed seeding, plasma radiation could be enhanced at the upstream region in the edge plasma with suppression of impurity accumulation toward the core plasma. Here, the pre-seeded Kr emission was drastically enhanced after the subsequent Ne seeding. Moreover, the detachment using Kr+Ne seeding could be stably sustained while the detachment using single species seeding is short-lived. Reduction of edge electron temperature due to Ne seeding can promote the Kr emission at the upstream region. It indicates the availability of multi-species impurity seeding with different cooling rate.

Details

Language :
English
ISSN :
18806821
Volume :
15
Database :
OpenAIRE
Journal :
Plasma and Fusion Research
Accession number :
edsair.doi.dedup.....217a40a4ccc81c2939f9a96ab1aa73be
Full Text :
https://doi.org/10.1585/pfr.15.1402051