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Title: NIMROD modeling of quiescent H-mode: Reconstruction considerations and saturation mechanism

Abstract

The extended-MHD NIMROD code (Sovinec and King 2010 J. Comput. Phys. 229 5803) models broadband-MHD activity from a reconstruction of a quiescent H-mode shot on the DIII-D tokamak (Luxon 2002 Nucl. Fusion 42 614). Computations with the reconstructed toroidal and poloidal ion flows exhibit low-n Φ perturbations (n Φ ≃1–5) that grow and saturate into a turbulent-like MHD state. The workflow used to project the reconstructed state onto the NIMROD basis functions re-solves the Grad–Shafranov equation and extrapolates profiles to include scrape-off-layer currents. In conclusion, evaluation of the transport from the turbulent-like MHD state leads to a relaxation of the density and temperature profiles.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [1];  [1];  [2]
  1. Tech-X Corp., Boulder, CO (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Tech-X Corp., Boulder, CO (United States); General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1327325
Grant/Contract Number:  
FC02-06ER54875; FC02-04ER54698
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 2; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

King, Jacob R., Burrell, Keith H., Garofalo, Andrea M., Groebner, Richard J., Kruger, S. E., Pankin, Alexei Y., and Snyder, Philip B. NIMROD modeling of quiescent H-mode: Reconstruction considerations and saturation mechanism. United States: N. p., 2016. Web. doi:10.1088/0029-5515/57/2/022002.
King, Jacob R., Burrell, Keith H., Garofalo, Andrea M., Groebner, Richard J., Kruger, S. E., Pankin, Alexei Y., & Snyder, Philip B. NIMROD modeling of quiescent H-mode: Reconstruction considerations and saturation mechanism. United States. doi:10.1088/0029-5515/57/2/022002.
King, Jacob R., Burrell, Keith H., Garofalo, Andrea M., Groebner, Richard J., Kruger, S. E., Pankin, Alexei Y., and Snyder, Philip B. Fri . "NIMROD modeling of quiescent H-mode: Reconstruction considerations and saturation mechanism". United States. doi:10.1088/0029-5515/57/2/022002. https://www.osti.gov/servlets/purl/1327325.
@article{osti_1327325,
title = {NIMROD modeling of quiescent H-mode: Reconstruction considerations and saturation mechanism},
author = {King, Jacob R. and Burrell, Keith H. and Garofalo, Andrea M. and Groebner, Richard J. and Kruger, S. E. and Pankin, Alexei Y. and Snyder, Philip B.},
abstractNote = {The extended-MHD NIMROD code (Sovinec and King 2010 J. Comput. Phys. 229 5803) models broadband-MHD activity from a reconstruction of a quiescent H-mode shot on the DIII-D tokamak (Luxon 2002 Nucl. Fusion 42 614). Computations with the reconstructed toroidal and poloidal ion flows exhibit low-nΦ perturbations (nΦ ≃1–5) that grow and saturate into a turbulent-like MHD state. The workflow used to project the reconstructed state onto the NIMROD basis functions re-solves the Grad–Shafranov equation and extrapolates profiles to include scrape-off-layer currents. In conclusion, evaluation of the transport from the turbulent-like MHD state leads to a relaxation of the density and temperature profiles.},
doi = {10.1088/0029-5515/57/2/022002},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = 2,
volume = 57,
place = {United States},
year = {2016},
month = {9}
}

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Cited by: 4 works
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