Journal
NUCLEAR FUSION
Volume 57, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0029-5515/57/2/022011
Keywords
ELM; tokamak; extended MHD model; plasma rotation
Categories
Funding
- JSPS KAKENHI Grant [15K06656]
- Grants-in-Aid for Scientific Research [15K06656, 25820442] Funding Source: KAKEN
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The effect of ion diamagnetic drift on the stability of peeling-ballooning modes in rotating tokamak plasmas has been analyzed numerically. The results show that plasma toroidal rotation can not only destabilize the peeling-ballooning mode but also can reduce the ion diamagnetic drift effect on the mode stability, even though the ion diamagnetic drift effect stabilizes the mode in a static plasma. Plasma poloidal rotation can also destabilize the mode and cancel the ion diamagnetic drift effect, even when the rotation frequency is much smaller than the toroidal one. These impacts of the rotation on the stability can resolve the discrepancy between the result of the numerical stability analysis and the experimental result in type-I ELMy H-mode plasmas in JT-60U. The reduction of the ion diamagnetic drift effect on ELM stability due to plasma rotation is shown to depend on the direction of the rotation, so that the ion diamagnetic drift effect becomes negligible only when the JT-60U plasma rotates in the direction counter to the plasma current.
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