Analysis of ELM stability with extended MHD models in JET, JT-60U and future JT-60SA tokamak plasmas
[1];
[4];
- National Institutes for Quantum and Radiological Science and Technology, Rokkasho, Aomori (Japan)
- Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE)
- National Institutes for Quantum and Radiological Science and Technology, Naka, Ibaraki (Japan)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- KTH Royal Inst. of Technology, Stockholm (Sweden)
- CEA, IRFM, St. Paul Lez Durance (France); Eindhoven Univ. of Technology (Netherlands)
The stability with respect to a peeling–ballooning mode (PBM) was investigated numerically with extended MHD simulation codes in JET, JT-60U and future JT-60SA plasmas. The MINERVA-DI code was used to analyze the linear stability, including the effects of rotation and ion diamagnetic drift ($${\omega }_{* {\rm{i}}}$$), in JET-ILW and JT-60SA plasmas, and the JOREK code was used to simulate nonlinear dynamics with rotation, viscosity and resistivity in JT-60U plasmas. It was validated quantitatively that the ELM trigger condition in JET-ILW plasmas can be reasonably explained by taking into account both the rotation and $${\omega }_{* {\rm{i}}}$$ effects in the numerical analysis. When deuterium poloidal rotation is evaluated based on neoclassical theory, an increase in the effective charge of plasma destabilizes the PBM because of an acceleration of rotation and a decrease in $${\omega }_{* {\rm{i}}}$$. The difference in the amount of ELM energy loss in JT-60U plasmas rotating in opposite directions was reproduced qualitatively with JOREK. By comparing the ELM affected areas with linear eigenfunctions, it was confirmed that the difference in the linear stability property, due not to the rotation direction but to the plasma density profile, is thought to be responsible for changing the ELM energy loss just after the ELM crash. A predictive study to determine the pedestal profiles in JT-60SA was performed by updating the EPED1 model to include the rotation and $${\omega }_{* {\rm{i}}}$$ effects in the PBM stability analysis. It was shown that the plasma rotation predicted with the neoclassical toroidal viscosity degrades the pedestal performance by about 10% by destabilizing the PBM, but the pressure pedestal height will be high enough to achieve the target parameters required for the ITER-like shape inductive scenario in JT-60SA.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; JSPS KAKENHI; Euratom research and training programme
- Contributing Organization:
- JET Contributors and JT-60SA Research Unit
- Grant/Contract Number:
- AC05-00OR22725; 15K06656; 633053
- OSTI ID:
- 1822100
- Journal Information:
- Plasma Physics and Controlled Fusion, Vol. 60, Issue 1; ISSN 0741-3335
- Publisher:
- IOP ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Role of the pedestal position on the pedestal performance in AUG, JET-ILW and TCV and implications for ITER
|
journal | June 2019 |
Direct gyrokinetic comparison of pedestal transport in JET with carbon and ITER-like walls
|
journal | July 2019 |
Non-linear magnetohydrodynamic simulations of pellet triggered edge-localized modes in JET
|
journal | December 2019 |
| Direct Gyrokinetic Comparison of Pedestal Transport in JET with Carbon and ITER-Like Walls | text | January 2019 |
Advances in the physics studies for the JT-60SA tokamak exploitation and research plan
|
journal | October 2019 |
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