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Title: The General Atomics Center for Magnetohydrodynamic Modeling (CEMM) Final Report

Abstract

The Center for Extended Magnetohydrodynamic Modeling (CEMM) is built around the further development, verification, validation, and other application of two major extended magnetohydrodynamics (MHD) codes NIMROD and M3D-C1. The General Atomics (GA) CEMM Program focuses on three main research areas: extension of the M3D-C1 MHD code plasma response calculations to new regimes, coupling of the DK4D drift kinetic equation solver to a temperature evolution equation, and simulations of disruption mitigation for unstable plasmas with pre-existing magnetic islands using massive gas injection (MGI) with the NIMROD MHD code. A systematic scan of the zero-crossing of the rotation profile in a DIII-D ITER-similar shape equilibrium using linear, time-independent modeling with M3D-C1 was performed. A new Python utility, autoC1, has been developed to automate the running of M3D-C1 for linear simulations. A number of ELM suppression experiments were analyzed including a validation and cross-code verification with the MARS-F MHD code of magnetic signal phase shifts across ELM-suppression bifurcations. A linearized, time-dependent temperature equation was tightly coupled to the electron and ion drift-kinetic equations (DKEs) in the DK4D drift-kinetic equation solver. Various explicit and implicit implementations were attempted, but all methods proved numerically unstable, even with the addition of numerical dissipation. Several simulations weremore » completed investigating the effects of pre-existing islands on disruption mitigation by MGI in DIII-D using NIMROD.« less

Authors:
ORCiD logo [1]
  1. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1417949
Report Number(s):
Final Report GA-A28747 DOE-GA-15499
DOE Contract Number:  
SC0015499
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 3D MHD Simulation; Tokamak; Fusion Energy Research; Disruption Mitigation; ELM

Citation Formats

Lao, Lang L. The General Atomics Center for Magnetohydrodynamic Modeling (CEMM) Final Report. United States: N. p., 2018. Web. doi:10.2172/1417949.
Lao, Lang L. The General Atomics Center for Magnetohydrodynamic Modeling (CEMM) Final Report. United States. doi:10.2172/1417949.
Lao, Lang L. Thu . "The General Atomics Center for Magnetohydrodynamic Modeling (CEMM) Final Report". United States. doi:10.2172/1417949. https://www.osti.gov/servlets/purl/1417949.
@article{osti_1417949,
title = {The General Atomics Center for Magnetohydrodynamic Modeling (CEMM) Final Report},
author = {Lao, Lang L.},
abstractNote = {The Center for Extended Magnetohydrodynamic Modeling (CEMM) is built around the further development, verification, validation, and other application of two major extended magnetohydrodynamics (MHD) codes NIMROD and M3D-C1. The General Atomics (GA) CEMM Program focuses on three main research areas: extension of the M3D-C1 MHD code plasma response calculations to new regimes, coupling of the DK4D drift kinetic equation solver to a temperature evolution equation, and simulations of disruption mitigation for unstable plasmas with pre-existing magnetic islands using massive gas injection (MGI) with the NIMROD MHD code. A systematic scan of the zero-crossing of the rotation profile in a DIII-D ITER-similar shape equilibrium using linear, time-independent modeling with M3D-C1 was performed. A new Python utility, autoC1, has been developed to automate the running of M3D-C1 for linear simulations. A number of ELM suppression experiments were analyzed including a validation and cross-code verification with the MARS-F MHD code of magnetic signal phase shifts across ELM-suppression bifurcations. A linearized, time-dependent temperature equation was tightly coupled to the electron and ion drift-kinetic equations (DKEs) in the DK4D drift-kinetic equation solver. Various explicit and implicit implementations were attempted, but all methods proved numerically unstable, even with the addition of numerical dissipation. Several simulations were completed investigating the effects of pre-existing islands on disruption mitigation by MGI in DIII-D using NIMROD.},
doi = {10.2172/1417949},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {1}
}