Dependence of Edge Stability on Plasma Shape and Local Pressure Gradients in the DIII-D and JT-60U Tokamaks
- General Atomics
- Japan Atomic Energy Agency (JAEA)
- ORNL
- Princeton Plasma Physics Laboratory (PPPL)
- Lawrence Livermore National Laboratory (LLNL)
The dependence of edge stability on plasma shape and local pressure gradients, P, in the DIII-D and JT-60U tokamaks is studied. The stronger plasma shaping in DIII-D allows the edge region of DIII-D discharges with Type I ("giant") ELMs to have access to the second region of stability for ideal ballooning modes and larger edge P′than JT-60U Type I ELM discharges. These JT-60U discharges are near the ballooning mode first regime stability limit. DIII-D results support an ideal stability based working model of Type I ELMs as low to intermediate toroidal mode number, n, MHD modes. Results from stability analysis of JT-60U Type I ELM discharges indicate that predictions from this model are also consistent with JT-60U edge stability observations.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 930821
- Resource Relation:
- Conference: 18th IAEA Fusion Energy Conference, Sorrento, Italy, 20061004, 20061010
- Country of Publication:
- United States
- Language:
- English
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