Application of the Transition Model of Edge Pedestal Properties in 𝑗𝜙-𝛼 Space to a KSTAR-like Tokamak
- Resource Type
- Article
- Authors
- K. D. Kim; O. Kwon; S.K.Kim
- Source
- Journal of the Korean Physical Society, 74(3), pp.231-235 Feb, 2019
- Subject
- 물리학
- Language
- English
- ISSN
- 1976-8524
0374-4884
We calculated the transition of edge pedestal properties in j- space for a KSTAR-like plasma and compared the results with those from the analytical transition model. The transition is from a critical equilibrium that is marginally stable to the peeling or the ballooning mode to another critical equilibrium when plasma parameters such as triangularity, elongation, and p change. The transition should not be confused with the L-H transition. We have divided the transition into two. The rst transition is when plasma parameters change for xed pedestal width while the second transition is when the pedestal width changes for xed plasma parameters. The direction of the rst transition when triangularity or elongation increases is as such that j decreases and increases. The direction of the rst transition with varying p depends on the choice of how the temperature or the current density is modied. The direction of the second transition is determined from the stability condition of the new equilibrium after the rst transition.