1. Study of runaway current generation following disruptions in KSTAR.
- Author
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Chen, Z. Y., Kim, W. C., Yu, Y. W., England, A. C., Yoo, J. W., Hahn, S. H., Yoon, S. W., Lee, K. D., Oh, Y. K., Kwak, J. G., and Kwon, M.
- Subjects
TOKAMAKS ,TOROIDAL magnetic circuits ,TOROIDAL harmonics ,PLASMA confinement ,MAGNETIC fields ,FIELD theory (Physics) ,MATHEMATICAL models - Abstract
The high fraction of runaway current conversion following disruptions has an important effect on the first wall for next-generation tokamaks. Because of the potentially severe consequences of a large full current runaway beam on the first wall in an unmitigated disruption, runaway suppression is given a high priority. The behavior of runaway currents both in spontaneous disruptions and in D
2 massive gas injection (MGI) shutdown experiments is investigated in the KSTAR tokamak. The experiments in KSTAR show that the toroidal magnetic field threshold, BT > 2 T, for runaway generation is not absolute. A high fraction of runaway current conversion following spontaneous disruptions is observed at a much lower toroidal magnetic field of BT = 1.3 T. A dedicated fast valve for high-pressure gas injection with 39.7 bar is developed for the study of disruptions. A study of runaway current parameters shows that the conversion efficiency of pre-disruptive plasma currents into runaway current can reach over 80% both in spontaneous disruptions and in D2 MGI shutdown experiments in KSTAR. [ABSTRACT FROM AUTHOR]- Published
- 2013
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