Experimental observations and modelling of radiation asymmetries during N2 seeding in LHD

Experimental observations and modelling of radiation asymmetries during N2 seeding in LHD

N2 gas has been seeded in the Large Helical Device (LHD) to reduce the divertor heat load through enhanced radiation. Radiation is observed by two imaging bolometers, viewing the same poloidal cross-section from top and bottom ports, at a location which is 36° toroidally removed from the N2 gas puff...

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Veröffentlicht in:Nuclear materials and energy 2021-03, Vol.26, p.100848, Article 100848
Hauptverfasser: Peterson, B.J., Kawamura, G., van de Giessen, P.L., Mukai, K., Tanaka, H., Sano, R., Pandya, S.N., Dai, S.Y., Masuzaki, S., Akiyama, T., Kobayashi, M., Goto, M., Motojima, G., Sakamoto, R., Ohno, N., Morisaki, T., Miyazawa, J.
Format: Artikel
Sprache:eng
Schlagworte:
Bolometer
Impurity seeding
Magnetic fusion
Plasma
Radiation
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Zusammenfassung:N2 gas has been seeded in the Large Helical Device (LHD) to reduce the divertor heat load through enhanced radiation. Radiation is observed by two imaging bolometers, viewing the same poloidal cross-section from top and bottom ports, at a location which is 36° toroidally removed from the N2 gas puff nozzle located at the bottom of the machine. During N2 seeding, these measurements both confirm that additional radiation from the outboard side is coming exclusively from the top of the cross-section, indicating up/down asymmetry, which is also reproduced by modelling with EMC3-EIRENE using a half torus model. In addition, a toroidally localized, magnetic field direction-dependent radiation enhancement is observed with N2 seeding, but is not reproducible by the model.
ISSN:2352-1791
2352-1791
DOI:10.1016/j.nme.2020.100848