Screening of resonant magnetic perturbation fields assuming various plasma flow models
- Donghua Univ., Shanghai (China). College of Science; Ministry of Education, Shanghai (China). Member of Magnetic Confinement Fusion Research Centre; Donghua Univ., Shanghai (China)
- General Atomics, San Diego, CA (United States)
- Culham Science Centre, Abingdon (United Kingdom). CCFE
- Donghua Univ., Shanghai (China). College of Science; Ministry of Education, Shanghai (China). Member of Magnetic Confinement Fusion Research Centre
- Dalian Univ. of Technology (China). Faculty of Electronic information and Electrical Engineering
A recently updated version of the MARS-F code [Y. Q. Liu et al., Phys. Plasmas 7, 3681 (2000); L. Li et al., Phys. Plasmas 25, 082512 (2018); and G. L. Xia et al., Nucl. Fusion 59, 126035 (2019)] is utilized to numerically investigate the plasma screening effect on the applied resonant magnetic perturbation (RMP) field, assuming various equilibrium flow models, including the toroidal flow, the parallel flow and their combinations, and poloidal and toroidal projections of the parallel flow. A parallel equilibrium flow with a uniform radial profile is found to have no effect on plasma screening of the RMP field. A sheared parallel flow, however, does change plasma screening. The poloidal projection of the parallel flow weakens plasma screening in the resistive-inertial regime. The effect on the favorable average curvature regime is found, however, to be non-monotonic. With the increasing flow speed, the poloidal projection first weakens Glasser-Green-Johnson (GGJ)-screening. Further increase in the flow speed results in enhanced GGJ-screening again. This non-monotonic behavior is related to the perturbed parallel shielding current, which appears also off the mode rational surface at fast flow due to additional resonances between the RMP perturbation and the sound wave continuum. These results indicate that flow induced plasma screening to the RMP field can have complicated characteristics, which, in turn, can have implications on the RMP field penetration into the plasma in experiments for controlling the edge localized modes.
- Research Organization:
- General Atomics, San Diego, CA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)
- Grant/Contract Number:
- FC02-04ER54698; FG02-95ER54309
- OSTI ID:
- 1849028
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 28; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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