Abstract Details
Abstracts
Author: Minglei Yang
Requested Type: Poster
Submitted: 2024-04-15 07:25:13
Co-authors: Diego del-Castillo-Negrete, Matthew Beidler, Eric Hollmann, Larry Baylor
Contact Info:
Oak Ridge National Laboratory
5200, 1 Bethel Valley Rd
Oak Ridge, TN 37830
US
Abstract Text:
A modeling and simulation study of the dissipation of runaway electrons (RE) due to impurity injection in DIII-D and JET post-disruption plasmas is presented. The study utilizes the Kinetic Orbit Runaway Electron Code (KORC) to model RE dynamics and mitigation processes including regular collisions and large-angle collisions resulting in secondary avalanche source of RE. 3D stochastic differential equations are used to evolve the momentum, pitch angle and minor radius of REs, representing the transport coefficients including the physics of partially ionized and neutral impurities. A 1D neutral diffusion model is coupled to KORC to improve the prediction of the observed RE current dissipation using avalanche theory. Furthermore, the study integrates algorithms optimized for computational efficiency and robustness for the initialization of RE and the quantification of avalanche sources. The study focuses on the spatiotemporal evolution of the electron and impurity density profiles resulting from impurity injection and their interaction with RE in time dependent scenarios.
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