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Investigation of TESPEL cloud dynamics in Wendelstein 7-X stellarator

Kocsis, G. ; Tamura, N. ; Bussiahn, R. ; McCarthy, K.J. ; Baldzuhn, J. ; Biedermann, C. ; Cseh, G. ; Damm, H. ; Kornejew, P. ; König, R. ; Panadero, N. ; Szepesi, T.

Nuclear fusion, 2021-01, Vol.61 (1), p.16006 [Periódico revisado por pares]

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Título:
Investigation of TESPEL cloud dynamics in Wendelstein 7-X stellarator
Autor: Kocsis, G. ; Tamura, N. ; Bussiahn, R. ; McCarthy, K.J. ; Baldzuhn, J. ; Biedermann, C. ; Cseh, G. ; Damm, H. ; Kornejew, P. ; König, R. ; Panadero, N. ; Szepesi, T.
É parte de: Nuclear fusion, 2021-01, Vol.61 (1), p.16006
Descrição: Abstract Tracer-encapsulated solid pellet (TESPEL) was injected from the outboard midplane into Wendelstein 7-X (W7-X) plasmas. Viewing from behind the flight path, the distribution of the light emissions from the TESPEL cloud particles (H, C and C 2+ ) was recorded using an ultrafast visible camera with a temporal resolution up to 2 µ s, which allows resolving both the pellet cloud evolution and the detachment of the drifting cloud. It was observed that both the B┴ and the B║ aligned dimensions of the pellet cloud fluctuate quasi-periodically, this being associated with a vertical cloud movement and an eruption/ejection of part of the cloud. It is found that, first, the pellet cloud expands parallel to the magnetic field lines for about 10 µ s. Then, when the cloud reaches a certain B║ size the ionized part of the cloud (plasmoid) moves vertically (typically upwards) and detaches itself from the pellet within 10 µ s. One possible explanation for the upward movement of the pellet cloud is the presence of a vertical component of grad(B) pointing downward resulting in an upward cloud drift.
Idioma: Inglês

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