TY - JOUR
T1 - Analysis of ELM stability with extended MHD models in JET, JT-60U and future JT-60SA tokamak plasmas
AU - the JET contributors
AU - JT-60SA Research Unit
AU - Aiba, Nobuyuki
AU - Pamela, S.
AU - Honda, Mitsuru
AU - Urano, Hajime
AU - Giroud, C.
AU - Delabie, E.
AU - Frassinetti, L.
AU - Lupelli, I.
AU - Hayashi, Nobuhiko
AU - Huijsmans, G. T.A.
AU - Litaudon, Xavier
AU - Abduallev, S.
AU - Abhangi, M.
AU - Abreu, P.
AU - Afzal, M.
AU - Aggarwal, K. M.
AU - Ahlgren, T.
AU - Ahn, J. H.
AU - Aho-Mantila, L.
AU - Airila, M.
AU - Albanese, R.
AU - Aldred, V.
AU - Alegre, D.
AU - Alessi, E.
AU - Aleynikov, P.
AU - Alfier, A.
AU - Alkseev, A.
AU - Allinson, M.
AU - Alper, B.
AU - Alves, E.
AU - Ambrosino, G.
AU - Ambrosino, R.
AU - Amicucci, L.
AU - Amosov, V.
AU - Crombé, K.
AU - Dumortier, P.
AU - Durodié, F.
AU - Jachmich, Stefan
AU - Kazakov, Y.
AU - Krivska, A.
AU - Lerche, E.
AU - Lyssoivan, A.
AU - Messiaen, A.
AU - Moradi, S.
AU - Ongena, Jef
AU - Ragona, R.
AU - Stepanov, I.
AU - Van Eester, D.
AU - Verdoolaege, G.
AU - Wauters, T.
N1 - Publisher Copyright:
© 2017 IOP Publishing Ltd.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - The stability with respect to a peelingballooning mode (PBM) was investigated numerically with extended MHD simulation codes in JET, JT-60U and future JT-60SA plasmas. The MINERVA-DI code was used to analyze the linear stability, including the effects of rotation and ion diamagnetic drift (w∗i), in JET-ILW and JT-60SA plasmas, and the JOREK code was used to simulate nonlinear dynamics with rotation, viscosity and resistivity in JT-60U plasmas. It was validated quantitatively that the ELM trigger condition in JET-ILW plasmas can be reasonably explained by taking into account both the rotation and w∗i effects in the numerical analysis. When deuterium poloidal rotation is evaluated based on neoclassical theory, an increase in the effective charge of plasma destabilizes the PBM because of an acceleration of rotation and a decrease in w∗i. The difference in the amount of ELM energy loss in JT-60U plasmas rotating in opposite directions was reproduced qualitatively with JOREK. By comparing the ELM affected areas with linear eigenfunctions, it was confirmed that the difference in the linear stability property, due not to the rotation direction but to the plasma density profile, is thought to be responsible for changing the ELM energy loss just after the ELM crash. A predictive study to determine the pedestal profiles in JT-60SA was performed by updating the EPED1 model to include the rotation and w∗i effects in the PBM stability analysis. It was shown that the plasma rotation predicted with the neoclassical toroidal viscosity degrades the pedestal performance by about 10% by destabilizing the PBM, but the pressure pedestal height will be high enough to achieve the target parameters required for the ITER-like shape inductive scenario in JT-60SA.
AB - The stability with respect to a peelingballooning mode (PBM) was investigated numerically with extended MHD simulation codes in JET, JT-60U and future JT-60SA plasmas. The MINERVA-DI code was used to analyze the linear stability, including the effects of rotation and ion diamagnetic drift (w∗i), in JET-ILW and JT-60SA plasmas, and the JOREK code was used to simulate nonlinear dynamics with rotation, viscosity and resistivity in JT-60U plasmas. It was validated quantitatively that the ELM trigger condition in JET-ILW plasmas can be reasonably explained by taking into account both the rotation and w∗i effects in the numerical analysis. When deuterium poloidal rotation is evaluated based on neoclassical theory, an increase in the effective charge of plasma destabilizes the PBM because of an acceleration of rotation and a decrease in w∗i. The difference in the amount of ELM energy loss in JT-60U plasmas rotating in opposite directions was reproduced qualitatively with JOREK. By comparing the ELM affected areas with linear eigenfunctions, it was confirmed that the difference in the linear stability property, due not to the rotation direction but to the plasma density profile, is thought to be responsible for changing the ELM energy loss just after the ELM crash. A predictive study to determine the pedestal profiles in JT-60SA was performed by updating the EPED1 model to include the rotation and w∗i effects in the PBM stability analysis. It was shown that the plasma rotation predicted with the neoclassical toroidal viscosity degrades the pedestal performance by about 10% by destabilizing the PBM, but the pressure pedestal height will be high enough to achieve the target parameters required for the ITER-like shape inductive scenario in JT-60SA.
KW - ELM
KW - H-mode
KW - extended MHD model
KW - rotation
KW - tokamaks
UR - http://www.scopus.com/inward/record.url?scp=85038417765&partnerID=8YFLogxK
U2 - 10.1088/1361-6587/aa8bec
DO - 10.1088/1361-6587/aa8bec
M3 - Article
AN - SCOPUS:85038417765
SN - 0741-3335
VL - 60
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 1
M1 - 014032
ER -