scholarly journals Three-dimensional plasmoid-mediated reconnection and the effect of toroidal guide field in simulations of coaxial helicity injection

2019 ◽  
Vol 26 (9) ◽  
pp. 092502 ◽  
Author(s):  
F. Ebrahimi
Keyword(s):  
Three Dimensional ◽  
Helicity Injection ◽  
Guide Field ◽  
Coaxial Helicity Injection

scholarly journals Filaments and striations: anisotropies in observed, supersonic, highly magnetized turbulent clouds

2019 ◽  
Vol 492 (1) ◽  
pp. 668-685 ◽  
Author(s):  
James R Beattie ◽  
Christoph Federrath
Keyword(s):  
Magnetic Field ◽  
Column Density ◽  
Three Dimensional ◽  
High Density ◽  
Systematic Analysis ◽  
Guide Field ◽  
Degree Of Anisotropy ◽  
Mach Numbers ◽  
Magnetohydrodynamic Simulations ◽  
The Magnetic Field

ABSTRACT Stars form in highly magnetized, supersonic turbulent molecular clouds. Many of the tools and models that we use to carry out star formation studies rely upon the assumption of cloud isotropy. However, structures like high-density filaments in the presence of magnetic fields and magnetosonic striations introduce anisotropies into the cloud. In this study, we use the two-dimensional power spectrum to perform a systematic analysis of the anisotropies in the column density for a range of Alfvén Mach numbers ($\operatorname{\mathcal {M}_{\text{A}}}=0.1{\!-\!10}$) and turbulent Mach numbers ($\operatorname{\mathcal {M}}=2{\!-\!20}$), with 20 high-resolution, three-dimensional turbulent magnetohydrodynamic simulations. We find that for cases with a strong magnetic guide field, corresponding to $\operatorname{\mathcal {M}_{\text{A}}}\lt 1$, and $\operatorname{\mathcal {M}}\lesssim 4$, the anisotropy in the column density is dominated by thin striations aligned with the magnetic field, while for $\operatorname{\mathcal {M}}\gtrsim 4$ the anisotropy is significantly changed by high-density filaments that form perpendicular to the magnetic guide field. Indeed, the strength of the magnetic field controls the degree of anisotropy and whether or not any anisotropy is present, but it is the turbulent motions controlled by $\operatorname{\mathcal {M}}$ that determine which kind of anisotropy dominates the morphology of a cloud.

Three-dimensional modeling of electron quasiviscous dissipation in guide-field magnetic reconnection

2005 ◽  
Vol 12 (10) ◽  
pp. 100704 ◽  
Author(s):  
Michael Hesse ◽  
Masha Kuznetsova ◽  
Karl Schindler ◽  
Joachim Birn
Keyword(s):  
Magnetic Reconnection ◽  
Three Dimensional ◽  
Three Dimensional Modeling ◽  
Guide Field ◽  
Dimensional Modeling

Temperature and density characteristics of the Helicity Injected Torus-II spherical tokamak indicating closed flux sustainment using coaxial helicity injection

2008 ◽  
Vol 15 (8) ◽  
pp. 082501 ◽  
Author(s):  
W. T. Hamp ◽  
T. R. Jarboe ◽  
B. A. Nelson ◽  
R. G. O’Neill ◽  
R. Raman ◽  
...  
Keyword(s):  
Spherical Tokamak ◽  
Helicity Injection ◽  
Coaxial Helicity Injection

Low Aspect Ratio Tokamak Formation and Sustainment by Coaxial Helicity Injection Current Drive

1995 ◽  
Vol 27 (3T) ◽  
pp. 333-336
Author(s):  
B. A. Nelson ◽  
T. R. Jarboe ◽  
D. J. Orvis ◽  
A. K. Martin ◽  
J. Xie ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Current Drive ◽  
Injection Current ◽  
Helicity Injection ◽  
Low Aspect Ratio ◽  
Coaxial Helicity Injection

Magnetic reconnection process in transient coaxial helicity injection

2013 ◽  
Vol 20 (9) ◽  
pp. 090702 ◽  
Author(s):  
F. Ebrahimi ◽  
E. B. Hooper ◽  
C. R. Sovinec ◽  
R. Raman
Keyword(s):  
Magnetic Reconnection ◽  
Helicity Injection ◽  
Reconnection Process ◽  
Coaxial Helicity Injection

scholarly journals NSTX Plasma Start-Up Using Transient Coaxial Helicity Injection

2007 ◽  
Vol 52 (3) ◽  
pp. 393-397 ◽  
Author(s):  
D. Mueller ◽  
R. Raman ◽  
M. G. Bell ◽  
T. R. Jarboe ◽  
B. LeBlanc ◽  
...  
Keyword(s):  
Helicity Injection ◽  
Start Up ◽  
Coaxial Helicity Injection

scholarly journals Simulation of multi-pulse coaxial helicity injection in the Sustained Spheromak Physics Experiment

2018 ◽  
Vol 25 (3) ◽  
pp. 032503 ◽  
Author(s):  
J. B. O'Bryan ◽  
C. A. Romero-Talamás ◽  
S. Woodruff
Keyword(s):  
Helicity Injection ◽  
Coaxial Helicity Injection ◽  
Physics Experiment
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