Abstract Details
Abstracts
Author: Omar E Lopez
Requested Type: Poster
Submitted: 2024-04-12 22:17:43
Co-authors: M. T. Beidler
Contact Info:
Oak Ridge National Laboratory
Oak Ridge National Laboratory
Oak Ridge, TN 37831
United States
Abstract Text:
This work integrates the Kinetic Orbit Runaway electron Code (KORC) with the NIMROD's MHD equilibrium solver, resulting in a kinetic-RE-MHD hybrid model for quasi-static state analysis of post-disruption runaway electron beams in tokamaks, critical for ITER's wall integrity. By employing a Metropolis-Hastings method, the model initializes a mono-energy and mono-pitch RE beam from a DIII-D current profile. It utilizes a guiding center orbit-averaging technique for calculating RE drift and magnetization parallel currents at kinetic time steps, then maps these onto NIMROD's FE mesh via a weighted deposition. A similar orbit-averaging technique has been used in Ref. [1,2] for constructing quasi-static distributions that preclude prompt relaxation in PIC simulations. An orbit-average method deposits accumulated currents along passing and trapped orbits, rather than depositing current “snapshots”. It is expected that this model will require a lower number of REs to maintain accuracy, leading to computationally tractable quasi-static RE distributions.
[1] Bierwage et al, Comput. Phys. Comm. 183, 1107 (2012)
[2] Bierwage et al, Nucl. Fusion 53, 073007 (2013)
*This work is supported by the US DOE under contract DE-AC05-00OR22725
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