In:
Plasma Physics and Controlled Fusion, IOP Publishing, Vol. 65, No. 6 ( 2023-06-01), p. 065011-
Abstract:
Toroidal coupling between m / n = 2/1 and m / n = 3/1 modes frequently occurs in the J-TEXT, where m ( n ) is the poloidal (toroidal) mode number. These coupled modes destabilize each other, leading to confinement degradation and even triggering a major disruption. This paper presents two control strategies for preventing the mode coupling through the application of a proper static resonant magnetic perturbation (RMP) field. Experimental results demonstrate that moderate 2/1 RMP can suppress the small, rotating 2/1 mode thus prevent coupling between the 2/1 and 3/1 modes. The 3/1 static RMP can excite a large 3/1 locked island while leave the small 2/1 mode rotating at 8 kHz. Enlarging the frequency difference between 2/1 and 3/1 modes makes mode coupling more difficult. Both strategies can break the frequency coupling condition between the 2/1 and 3/1 modes, and hence avoid coupling and mutual destabilizing.
Type of Medium:
Online Resource
ISSN:
0741-3335
,
1361-6587
DOI:
10.1088/1361-6587/acd20f
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2023
detail.hit.zdb_id:
1473144-7
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