scholarly journals Suppression and saturation of error field-driven tearing mode for different magnetic shears in rotating plasmas

AIP Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 015107 ◽  
Author(s):  
Bang-Feng Zhang ◽  
Xian-Qu Wang
Keyword(s):  
Tearing Mode ◽  
Rotating Plasmas ◽  
Error Field

Error field locked modes thresholds in rotating plasmas, anomalous braking and spin-up

2002 ◽  
Vol 9 (9) ◽  
pp. 3906-3918 ◽  
Author(s):  
E. Lazzaro ◽  
R. J. Buttery ◽  
T. C. Hender ◽  
P. Zanca ◽  
R. Fitzpatrick ◽  
...  
Keyword(s):  
Rotating Plasmas ◽  
Error Field

Compressibility effects on double tearing mode interlocking in differentially rotating plasmas

2012 ◽  
Vol 376 (4) ◽  
pp. 505-509 ◽  
Author(s):  
Xian-Qu Wang ◽  
Zheng-Xiong Wang ◽  
Lai Wei ◽  
Wen-Bin Xu
Keyword(s):  
Tearing Mode ◽  
Rotating Plasmas ◽  
Compressibility Effects

scholarly journals Local measurement of error field using naturally rotating tearing mode dynamics in EXTRAP T2R

2016 ◽  
Vol 58 (12) ◽  
pp. 124001 ◽  
Author(s):  
R M Sweeney ◽  
L Frassinetti ◽  
P Brunsell ◽  
R Fridström ◽  
F A Volpe
Keyword(s):  
Local Measurement ◽  
Tearing Mode ◽  
Error Field

scholarly journals Triggering of Neoclassical Tearing Mode by Error Field Penetration

2018 ◽  
Vol 13 (0) ◽  
pp. 1203104-1203104 ◽  
Author(s):  
Seiya NISHIMURA ◽  
Ryusuke NUMATA
Keyword(s):  
Tearing Mode ◽  
Error Field ◽  
Neoclassical Tearing Mode ◽  
Field Penetration

scholarly journals A new stabilizing regime of tearing mode entrainment in the presence of a static error field

2019 ◽  
Vol 59 (12) ◽  
pp. 126015 ◽  
Author(s):  
M. Okabayashi ◽  
S. Inoue ◽  
N.C. Logan ◽  
N.Z. Taylor ◽  
E.J. Strait ◽  
...  
Keyword(s):  
Tearing Mode ◽  
Static Error ◽  
Error Field

Activated Prominences; Mechanisms for Activation and Eruption

1979 ◽  
Vol 44 ◽  
pp. 307-313
Author(s):  
D.S. Spicer
Keyword(s):  
Pressure Gradient ◽  
Density Gradient ◽  
Current Density ◽  
Convective Instability ◽  
Tearing Mode ◽  
Magnetic Shear ◽  
Long Wavelength ◽  
Ideal Mhd ◽  
Gradient Change ◽  
Accelerated Particles

A possible relationship between the hot prominence transition sheath, increased internal turbulent and/or helical motion prior to prominence eruption and the prominence eruption (“disparition brusque”) is discussed. The associated darkening of the filament or brightening of the prominence is interpreted as a change in the prominence’s internal pressure gradient which, if of the correct sign, can lead to short wavelength turbulent convection within the prominence. Associated with such a pressure gradient change may be the alteration of the current density gradient within the prominence. Such a change in the current density gradient may also be due to the relative motion of the neighbouring plages thereby increasing the magnetic shear within the prominence, i.e., steepening the current density gradient. Depending on the magnitude of the current density gradient, i.e., magnetic shear, disruption of the prominence can occur by either a long wavelength ideal MHD helical (“kink”) convective instability and/or a long wavelength resistive helical (“kink”) convective instability (tearing mode). The long wavelength ideal MHD helical instability will lead to helical rotation and thus unwinding due to diamagnetic effects and plasma ejections due to convection. The long wavelength resistive helical instability will lead to both unwinding and plasma ejections, but also to accelerated plasma flow, long wavelength magnetic field filamentation, accelerated particles and long wavelength heating internal to the prominence.

scholarly journals The electric field of the electrodes immersed into the rotating plasmas

2019 ◽  
Vol 1147 ◽  
pp. 012130
Author(s):  
G D Liziakin ◽  
A V Gavrikov ◽  
R A Usmanov ◽  
V P Smirnov
Keyword(s):  
Electric Field ◽  
Rotating Plasmas

scholarly journals Suppression of neoclassical tearing mode instability at the initial stage by electron cyclotron current drive

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035212
Author(s):  
Zhen Yang ◽  
Bin Wu ◽  
Yuanlai Xie ◽  
Yuqing Chen ◽  
Hongming Zhang ◽  
...  
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Tearing Mode ◽  
Mode Instability ◽  
Initial Stage ◽  
Neoclassical Tearing Mode

scholarly journals Figures of merit for stellarators near the magnetic axis

2021 ◽  
Vol 87 (1) ◽  
Author(s):  
Matt Landreman
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Axis ◽  
Configuration Design ◽  
New Paradigm ◽  
First Order ◽  
Figures Of Merit ◽  
Minor Radius ◽  
Error Field ◽  
Quantities Of Interest

A new paradigm for rapid stellarator configuration design has been recently demonstrated, in which the shapes of quasisymmetric or omnigenous flux surfaces are computed directly using an expansion in small distance from the magnetic axis. To further develop this approach, here we derive several other quantities of interest that can be rapidly computed from this near-axis expansion. First, the $\boldsymbol {\nabla }\boldsymbol {B}$ and $\boldsymbol {\nabla }\boldsymbol {\nabla }\boldsymbol {B}$ tensors are computed, which can be used for direct derivative-based optimization of electromagnetic coil shapes to achieve the desired magnetic configuration. Moreover, if the norm of these tensors is large compared with the field strength for a given magnetic field, the field must have a short length scale, suggesting it may be hard to produce with coils that are suitably far away. Second, we evaluate the minor radius at which the flux surface shapes would become singular, providing a lower bound on the achievable aspect ratio. This bound is also shown to be related to an equilibrium beta limit. Finally, for configurations that are constructed to achieve a desired magnetic field strength to first order in the expansion, we compute the error field that arises due to second-order terms.

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