| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] Inst Tecnol Aeronaut, Dept Fis, Sao Jose Dos Campos - Brazil
[2] Inst Estudos Avancados, Div Aerotermodinam & Hiperson, Sao Jose Dos Campos - Brazil
[3] Univ Sao Paulo, Inst Fis, Dept Fis Aplicada, Sao Paulo - Brazil
Total Affiliations: 3
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| Document type: | Journal article |
| Source: | Brazilian Journal of Physics; v. 48, n. 4, p. 426-432, AUG 2018. |
| Web of Science Citations: | 0 |
| Abstract | |
In certain circumstances, plasma response suppresses magnetic islands expected at perturbed resonant magnetic surfaces. We investigate the plasma response to the resonant magnetic perturbations in a large aspect ratio tokamak perturbed by external resonant helical windings, considering polar toroidal coordinates for which analytical toroidal equilibrium solutions and perturbing fields are available. We apply an empirical approach to mimic the plasma screening effects by introducing presumed plasma current sheets on the resonance surfaces to cancel the RMP effects. Numerical examples show the effect of plasma response reducing magnetic islands at the plasma edge and also regularizing field lines around the resonant surface. The distribution of connection lengths along the plasma cross section indicates that the plasma response increases the connection lengths since more toroidal turns are performed until a field line reaches the tokamak wall. (AU) | |
| FAPESP's process: | 15/16471-8 - Fusion plasma applications and modeling of low temperature plasmas |
| Grantee: | Marisa Roberto |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 11/19296-1 - Nonlinear dynamics |
| Grantee: | Iberê Luiz Caldas |
| Support Opportunities: | Research Projects - Thematic Grants |