Modeling of eddy current distribution in the SST-1 tokamak
| Autor: | M.V. Gopalakrishna, Santanu Banerjee, Sst team, D. Raju, Raghavan Srinivasan, I. Bandyopadhyay, S.K. Jha, Amit K. Singh, Deepti Sharma |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cryostat
Physics Tokamak Toroid Mechanical Engineering FOS: Physical sciences Plasma Mechanics 01 natural sciences Physics - Plasma Physics 010305 fluids & plasmas law.invention Magnetic field Plasma Physics (physics.plasm-ph) Nuclear Energy and Engineering Physics::Plasma Physics law SST-1 0103 physical sciences Eddy current General Materials Science 010306 general physics Transformer Physics::Atmospheric and Oceanic Physics Civil and Structural Engineering |
| Zdroj: | Fusion Engineering and Design. 127:216-225 |
| ISSN: | 0920-3796 |
| DOI: | 10.1016/j.fusengdes.2018.01.016 |
| Popis: | The time varying currents in the Ohmic transformer in the SST-1 tokamak induce voltages that drive large eddy currents in the passive structures like the vacuum vessel and cryostat. Since the vacuum vessel and the cryostat are toroidally continuous without electrical breaks in SST- 1, this leads to a shielding effect on the flux penetrating the vacuum vessel. This reduces the magnitude of the loop voltage seen by the plasma as also delays its buildup. Also the induced currents alter the null location of magnetic field. This will have serious implications on the plasma breakdown and startup and corrective measures may be required in case of an insufficient loop voltage or an improper null. Further, the eddy currents distribution will be vital for the plasma equilibrium and need to be considered while reconstructing the equilibrium. Evolution of the toroidal eddy currents in SST-1 passive structures has been studied using a toroidal-filament model. The model calculations are compared with the measured signals in the magnetic diagnostics like the toroidal flux loops and magnetic pick-up coils installed on the SST-1. Comment: 21 pages, 16 figures |
| Databáze: | OpenAIRE |
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