Abstract Details
Abstracts
Author: Chen Zhao
Requested Type: Consider for Invited
Submitted: 2023-03-24 11:13:26
Co-authors:
Contact Info:
General Atomics
3550 Genernal Atomics Court
San Diego, California 92121
United States
Abstract Text:
The injection of a frozen impurity pellet as a disruption mitigation system (DMS) for the next generation of large
tokamaks, including ITER, is a promising method for reducing the thermal and electromagnetic loads from a potential
disruption without generating enough high-energy (runaway) electrons to damage the device. The effectiveness of
this system has been tested on many experiments, with encouraging results. To further study its effects, we have
modeled one such DMS experiment on DIII-D using the M3D-C1 nonlinear 3D extended MHD code (Jardin et al 2012
J. Comput. Sci. Discovery). Our model includes the injection and ablation of a neon pellet, impurity ionization and
recombination, radiation, and the formation and evolution of runaway electrons, including both Dreicer and avalanche
sources. We have found that our model provides reasonable agreement with the experimental results, in terms of the
timescale of the thermal and current quench, and the magnitude of the runaway electron plateau formed during the
mitigation. This provides a partial validation of the M3D-C1 DMS model, and further highlights the potential of
using frozen impurity pellet injection for disruption mitigation in the next generation of large tokamaks
This work is supported by US DE-FG02-95ER54309 DOE grant, DE-FC02-04ER54698 DIII-D, SciDAC DE-
SC0016452 SCREAM and DE-SC0018109 CTTS.
Disclaimer: This report was prepared as an account of work sponsored by an agency of the United States Govern-
ment. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty,
express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any
information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned
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ufacturer, or otherwise do
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