Effect of the relative shift between the electron density and temperature pedestal position on the pedestal stability in JET-ILW

0462524 - ÚFP 2017 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Stefanikova, E. - Frassinetti, L. - Saarelma, S. - Loarte, A. - Nunes, I. - Lomas, P. - Rimini, F. - Drewelow, P. - Garzotti, L. - Kruezi, U. - Lomonowski, B. - De La Luna, E. - Meneses, L. - Peterka, Matěj - Viola, B.
Effect of the relative shift between the electron density and temperature pedestal position on the pedestal stability in JET-ILW.
EPS 2016: 43rd European Physical Society Conference on Plasma Physics. Vol. 40A. Mulhouse: European Physical Society, 2016 - (Mantica, P.; Giruzzi, G.; Fajardo, M.; Gans, T.; Poedts, S.; Vennekens, N.), č. článku O4.117. Europhysics Conference Abstracts (ECA), ECA, 40A. ISBN 2-914771-99-1.
[EPS 2016: Conference on Plasma Physics/43./. Leuven (BE), 04.07.2016-08.07.2016]
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: tokamak fusion * JET-ILW * MHD
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech

The pedestal structure and its stability affect the performance of a tokamak fusion device. As it has been already observed in DIII-D in [1], the electron temperature (Te) and density (ne) pedestals tend to vary in their relative positions in correlation with ρ*. Change in the relative positions seem to have an impact on the pedestal MHD stability and hence on the pedestal
height [2]. This work investigates the effects of the relative pedestal positions on the stability of JET-ILW. It shows that the increase of the pedestal relative shift is correlated with the reduction in the normalized pressure gradient. Experimental results are then compared with the peeling-ballooning (P-B) model. Normalized pressure gradient is then also calculated for extended dataset of JET-ILW baseline low δ pulses and compared with low δ JET-C pulses.
Trvalý link: http://hdl.handle.net/11104/0261966