Abstract
The JET Deuterium-Tritium-Experiment Campaign 2 (DTE2) has demonstrated the highest-ever fusion energy production. To forecast the transport dynamics within these discharges, the TGLF and NEO models within the TGYRO transport code were employed. A critical development in this study is the new quasilinear transport model, TGLF-SAT2, specifically designed to resolve discrepancies identified in JET deuterium discharges. This model accurately describes the saturated three-dimensional (3D) fluctuation spectrum, aligning closely with a database of nonlinear CGYRO turbulence simulations, thereby enhancing the predictive accuracy of TGYRO simulations. In validating against the JET DTE2 discharges across two primary operating scenarios, TGYRO effectively predicted the temperature profiles within a broad radial window (ρ ∼ 0.2-0.85), though with minor ion temperature discrepancies near the core. However, a consistent underprediction of electron density profiles by 20% across the simulation domain was noted, indicating areas for future refinement. To achieve a self-consistent steady-state solution based on the JET DTE2 discharges, an integrated modeling workflow TGYRO-STEP within the OMFIT framework was introduced. This workflow iterates among the core transport, the pedestal pressure and the MHD equilibrium, ultimately yielding a converged solution that significantly reduces dependence on experimental boundary conditions for temperature and density profiles. The integrated simulation results show negligible differences in electron density and temperature profiles compared to standalone TGYRO modeling, while the ion temperature profile is lower due to the updated boundary condition in TGYRO-STEP. The application of the TGYRO-STEP workflow to JET DTE2 discharges serves as a crucial test to validate its robustness and highlights its limitations, providing valuable insights for its potential future application in ITER and Fusion Power Plant deuterium and tritium prediction modeling.
| Original language | English |
|---|---|
| Article number | 076062 |
| Journal | Nuclear Fusion |
| Volume | 64 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2024 |
Funding
This work was supported by the U.S. Department of Energy under DE-SC0019736 and DE-FG02-95ER54309. This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200\u2014EUROfusion) and from the EPSRC [Grant Numbers EP/W006839/1]. We also extend our sincere thanks to Dr Samuli Saarelma for his valuable discussion on pedestal studies, particularly concerning P-B stability analysis. His insights have significantly enriched our understanding and contributed to the depth of this work.
Keywords
- D-T plasma transport modeling
- JET DTE2
- TGLF-SAT2
- TGYRO-STEP integrated modeling
