GITR Monte Carlo Predictive Simulations of the DIII-D SAS Divertor
ORAL
Abstract
The Global Impurity Transport Code (GITR) is a 3D fully gyrokinetic Monte Carlo transport code that can track impurity particle motion in great detail, capturing full 3D gyro-orbits, prompt re-deposition, and long-range migration distributions.
One goal of the Small Angle Slot (SAS) divertor in the DIII-D tokamak is to reduce net erosion. GITR will be used to provide a high physics fidelity model for tracking gross erosion and re-deposition, and correspondingly, to determine the net erosion of W impurities along the SAS surface. GITR will also be used to simulate W migration along the SOL and deposition along the wall. A synthetic diagnostic in GITR will be used to predict leakage from the scrape-off layer into the core.
Although GITR has been validated in a linear device, it has not yet been validated in a tokamak environment. Initial GITR simulations of W transport in the SAS divertor, in combination with experimental analyses, provide a validation opportunity for GITR predictions in a tokamak. This validation would allow GITR to be used to inform future designs of a SAS divertor geometry to further minimize net erosion and the leakage of W impurities into the core.
One goal of the Small Angle Slot (SAS) divertor in the DIII-D tokamak is to reduce net erosion. GITR will be used to provide a high physics fidelity model for tracking gross erosion and re-deposition, and correspondingly, to determine the net erosion of W impurities along the SAS surface. GITR will also be used to simulate W migration along the SOL and deposition along the wall. A synthetic diagnostic in GITR will be used to predict leakage from the scrape-off layer into the core.
Although GITR has been validated in a linear device, it has not yet been validated in a tokamak environment. Initial GITR simulations of W transport in the SAS divertor, in combination with experimental analyses, provide a validation opportunity for GITR predictions in a tokamak. This validation would allow GITR to be used to inform future designs of a SAS divertor geometry to further minimize net erosion and the leakage of W impurities into the core.
*This work contributes to the Plasma Surface Interactions 2 project, which is part of the Scientific Discovery through Advanced Computing (SciDAC) program, and is jointly sponsored by the Fusion Energy Sciences (FES) and Advanced Scientific Computing Research (ASCR) programs within the U.S. Department of Energy Office of Science.
–
Publication: Dissertation work
Presenters
-
Alyssa L Hayes
- University of Tennessee