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The role of edge plasma parameters in H-mode density limit on the JET-ILWSun, Hai-Jing ...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, lowast,SOL increases, SOL broadens, Er shear decreases, triggers L-mode; ne drops, lowast,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.Source: Nuclear fusion. - ISSN 0029-5515 (Vol. 61, Art. 066009, 2021)Type of material - article, component partPublish date - 2021Language - englishCOBISS.SI-ID - 71420163
Author
Sun, Hai-Jing |
Goldston, Robert J. |
Huber, A., fizik |
Flanagan, J. |
McDonald, D. C. |
Luna, E. de la |
Maslov, M. |
Harrison, J. R. |
Militello, Fulvio |
Čufar, Aljaž |
Kodeli, Ivan Aleksander |
Kos, Bor, 1989- |
Lengar, Igor |
Drenik, Aleksander, 1979- |
Štancar, Žiga |
Snoj, Luka, 1981-
Topics
jedrska fizika |
fizika plazme
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Sun, Hai-Jing | |
Goldston, Robert J. | |
Huber, A., fizik | |
Flanagan, J. | |
McDonald, D. C. | |
Luna, E. de la | |
Maslov, M. | |
Harrison, J. R. | |
Militello, Fulvio | |
Čufar, Aljaž | 36329 |
Kodeli, Ivan Aleksander | 03943 |
Kos, Bor, 1989- | 38202 |
Lengar, Igor | 19167 |
Drenik, Aleksander, 1979- | 26476 |
Štancar, Žiga | 37483 |
Snoj, Luka, 1981- | 27819 |
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