Hauptseite > Publikationsdatenbank > The role of edge plasma parameters in H-mode density limit on the JET-ILW > print

001     904076
005     20240712112902.0
024 7 _ |a 10.1088/1741-4326/abf056
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100 1 _ |a Sun, H. J.
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245 _ _ |a The role of edge plasma parameters in H-mode density limit on the JET-ILW
260 _ _ |a Vienna
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520 _ _ |a A study of a dataset of JET H-mode plasma with the Be/W ITER-like wall (JET-ILW) shows that reaching the edge MHD ballooning limit leads to confinement degradation. However, unlike JET plasmas with a carbon wall (JET-C), the JET-ILW plasmas stay in a marginal dithering phase for a relatively long period, associated with a higher (≈20%) H-mode density limit (HDL) than JET-C equivalents. This suggests that ITER could be operated in H-mode with higher density than the scaling based on carbon wall devices, but likely with a dithering phase plasma with lower confinement. A new, reliable estimator for JET Er, min has been derived by combining HRTS measurements of pedestal gradient and edge-SOL decay lengths. JET radial Er ETB wells are observed in the range of −15 to −60 kV m−1 in high performance H-modes, consistent with previous CXRS results in ASDEX Upgrade. The results imply that a higher positive E × B shear in the near SOL plays a role in sustaining a marginal phase in JET-ILW which leads to a higher HDL than that in JET-C. The results of the JET-ILW dataset show agreement with the Goldston finite collisionality HD model for SOL broadening at high collisionality. A hypothesis for the dithering H-mode phase is proposed: as ne,SOL increases, ν∗,SOL increases, SOL broadens, Er shear decreases, triggers L-mode; ne drops, ν∗,SOL decreases, SOL becomes narrower, and Er shear increases, triggering H-mode, resulting in a cycle of H–L–H- oscillations. For burning plasma devices, such as ITER, operating just below the MHD limit for the dithering phase could be a promising regime for maximising core density, and fusion performance while minimising plasma-material interaction. The oscillatory signal during the dithering phase could be used as a precursor of undesirable plasma performance for control purposes.
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700 1 _ |a Goldston, R. J.
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700 1 _ |a Huber, A.
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|e Corresponding author
700 1 _ |a Xu, X. Q.
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700 1 _ |a Flanagan, J.
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700 1 _ |a McDonald, D. C.
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700 1 _ |a de la Luna, E.
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700 1 _ |a Maslov, M.
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700 1 _ |a Harrison, J. R.
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700 1 _ |a Militello, F.
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700 1 _ |a Fessey, J.
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700 1 _ |a Cramp, S.
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773 _ _ |a 10.1088/1741-4326/abf056
|g Vol. 61, no. 6, p. 066009 -
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|t Nuclear fusion
|v 61
|y 2021
|x 0029-5515
856 4 _ |u https://juser.fz-juelich.de/record/904076/files/87079_understanding_the_role_of_edge_plasma_on_hdl._2.pdf
|y Published on 2021-04-28. Available in OpenAccess from 2022-04-28.
856 4 _ |u https://juser.fz-juelich.de/record/904076/files/Sun_2021_Nucl._Fusion_61_066009.pdf
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