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Title: Simulation of MHD instabilities with fluid runaway electron model in M3D- C 1

Abstract

Runaway electrons are generated in a tokamak during the start up, during normal operation and during a plasma disruption. During a disruption, runaway electrons can be accelerated to high energies, potentially damaging the first wall. To predict the consequences of runaway generation during a disruption, it is necessary to consider resonant interactions of runaways with the bulk plasma. Here we consider the interactions of runaways on low mode number tearing modes. We have developed a fluid runaway electron model for the 3D MHD code M3D-C1[Jardin,et al. J Comput. Sci Discovery 6 014002 (2012)]. To benchmark, we have reproduced the MHD linear tearing mode results (with runaway electrons) in a circular cylinder presented in previous analytic studies[[Helander, P., et al, Phys. Plasmas 14 144102 (2007)] and extended here with a numerical eigenvalue calculation. Furthermore, we find that the low mode number tearing mode has a rotation caused by the MHD - runaways interaction, and the toroidal current scale length is much smaller with runaways than that for without and decreases as the runaway speed increases.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1642436
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Name: Nuclear Fusion; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English

Citation Formats

Zhao, Chen, Liu, Chang, Jardin, Stephen C., and Ferraro, N. Simulation of MHD instabilities with fluid runaway electron model in M3D-C1. United States: N. p., 2020. Web. doi:10.1088/1741-4326/ab96f4.
Zhao, Chen, Liu, Chang, Jardin, Stephen C., & Ferraro, N. Simulation of MHD instabilities with fluid runaway electron model in M3D-C1. United States. doi:10.1088/1741-4326/ab96f4.
Zhao, Chen, Liu, Chang, Jardin, Stephen C., and Ferraro, N. Wed . "Simulation of MHD instabilities with fluid runaway electron model in M3D-C1". United States. doi:10.1088/1741-4326/ab96f4.
@article{osti_1642436,
title = {Simulation of MHD instabilities with fluid runaway electron model in M3D-C1},
author = {Zhao, Chen and Liu, Chang and Jardin, Stephen C. and Ferraro, N},
abstractNote = {Runaway electrons are generated in a tokamak during the start up, during normal operation and during a plasma disruption. During a disruption, runaway electrons can be accelerated to high energies, potentially damaging the first wall. To predict the consequences of runaway generation during a disruption, it is necessary to consider resonant interactions of runaways with the bulk plasma. Here we consider the interactions of runaways on low mode number tearing modes. We have developed a fluid runaway electron model for the 3D MHD code M3D-C1[Jardin,et al. J Comput. Sci Discovery 6 014002 (2012)]. To benchmark, we have reproduced the MHD linear tearing mode results (with runaway electrons) in a circular cylinder presented in previous analytic studies[[Helander, P., et al, Phys. Plasmas 14 144102 (2007)] and extended here with a numerical eigenvalue calculation. Furthermore, we find that the low mode number tearing mode has a rotation caused by the MHD - runaways interaction, and the toroidal current scale length is much smaller with runaways than that for without and decreases as the runaway speed increases.},
doi = {10.1088/1741-4326/ab96f4},
journal = {Nuclear Fusion},
issn = {0029-5515},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {5}
}

Journal Article:
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