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Title: Extended MHD modeling of nonlinear instabilities in fusion and space plasmas

Abstract

A number of different sub-projects where pursued within this DOE early career project. The primary focus was on using fully nonlinear, curvilinear, extended MHD simulations of instabilities with applications to fusion and space plasmas. In particular, we performed comprehensive studies of the dynamics of the double tearing mode in different regimes and confi gurations, using Cartesian and cyclindrical geometry and investigating both linear and non-linear dynamics. In addition to traditional extended MHD involving Hall term and electron pressure gradient, we also employed a new multi-fluid moment model, which shows great promise to incorporate kinetic effects, in particular off-diagonal elements of the pressure tensor, in a fluid model, which is naturally computationally much cheaper than fully kinetic particle or Vlasov simulations. We used our Vlasov code for detailed studies of how weak collisions effect plasma echos. In addition, we have played an important supporting role working with the PPPL theory group around Will Fox and Amitava Bhattacharjee on providing simulation support for HED plasma experiments performed at high-powered laser facilities like OMEGA-EP in Rochester, NY. This project has support a great number of computational advances in our fluid and kinetic plasma models, and has been crucial to winning multiple INCITE computermore » time awards that supported our computational modeling.« less

Authors:
 [1]
  1. Univ. of New Hampshire, Durham, NH (United States)
Publication Date:
Research Org.:
Univ. of New Hampshire, Durham, NH (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
PNNL
OSTI Identifier:
1228752
Report Number(s):
DOE-UNH-06670
TRN: US1801765
DOE Contract Number:  
SC0006670
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TEARING INSTABILITY; NONLINEAR PROBLEMS; PLASMA

Citation Formats

Germaschewski, Kai. Extended MHD modeling of nonlinear instabilities in fusion and space plasmas. United States: N. p., 2017. Web. doi:10.2172/1228752.
Germaschewski, Kai. Extended MHD modeling of nonlinear instabilities in fusion and space plasmas. United States. doi:10.2172/1228752.
Germaschewski, Kai. Wed . "Extended MHD modeling of nonlinear instabilities in fusion and space plasmas". United States. doi:10.2172/1228752. https://www.osti.gov/servlets/purl/1228752.
@article{osti_1228752,
title = {Extended MHD modeling of nonlinear instabilities in fusion and space plasmas},
author = {Germaschewski, Kai},
abstractNote = {A number of different sub-projects where pursued within this DOE early career project. The primary focus was on using fully nonlinear, curvilinear, extended MHD simulations of instabilities with applications to fusion and space plasmas. In particular, we performed comprehensive studies of the dynamics of the double tearing mode in different regimes and confi gurations, using Cartesian and cyclindrical geometry and investigating both linear and non-linear dynamics. In addition to traditional extended MHD involving Hall term and electron pressure gradient, we also employed a new multi-fluid moment model, which shows great promise to incorporate kinetic effects, in particular off-diagonal elements of the pressure tensor, in a fluid model, which is naturally computationally much cheaper than fully kinetic particle or Vlasov simulations. We used our Vlasov code for detailed studies of how weak collisions effect plasma echos. In addition, we have played an important supporting role working with the PPPL theory group around Will Fox and Amitava Bhattacharjee on providing simulation support for HED plasma experiments performed at high-powered laser facilities like OMEGA-EP in Rochester, NY. This project has support a great number of computational advances in our fluid and kinetic plasma models, and has been crucial to winning multiple INCITE computer time awards that supported our computational modeling.},
doi = {10.2172/1228752},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 15 00:00:00 EST 2017},
month = {Wed Nov 15 00:00:00 EST 2017}
}

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