Journal
NUCLEAR FUSION
Volume 60, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/ab61d5
Keywords
neo-classical tearing mode; reversed magnetic shear; resonant magnetic perturbation; electron cyclotron current drive
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Funding
- National Natural Science Foundation of China [11675083]
- National Key R&D Program of China [2017YFE0301900, 2017YFE0301100]
- Fundamental Research Funds for the Central Universities [DUT18ZD101, DUT17RC(4)54]
- Dalian Youth Science and Technology Project Support Program [2015R01]
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Synergetic effects of resonant magnetic perturbation (RMP) and electron cyclotron current drive (ECCD) on stabilizing neoclassical tearing mode (NTM) in reversed magnetic shear (RMS) tokamak plasmas are numerically investigated based on a set of reduced MHD equations. For the moderate separation, it is found that the explosive burst induced by the fast reconnection of double tearing mode (DTM) in the RMS configuration can be completely suppressed by externally applied RMPs. Zonal flows with strong shear induced by a rotating RMP play an important role in this suppression process. Moreover, turning on ECCD in advance is essential to mitigate the NTM. For the large separation without the explosive burst, two strategies, i.e. a continuous ECCD with static RMP and a modulated ECCD with rotating RMP, are separately investigated. It is shown that when the NTM is decelerated by a relatively slow rotating RMP, the modulated ECCD can have a better stabilizing effect. In addition, the ECCD deposition widths in both radial and helical angle directions, as well as the ECCD on-duty time, are analyzed in detail. The best effectiveness of ECCD is obtained and the relevant physical mechanisms are discussed.
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