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

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 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.

Equivalent Circuits of Rotating Plasmas

1974 ◽  
Vol 13 (12) ◽  
pp. 1971-1983 ◽  
Author(s):  
Tsuneo Ban ◽  
Tadashi Sekiguchi
Keyword(s):  
Equivalent Circuits ◽  
Rotating Plasmas

Dynamic decoupling and multi-mode magnetic feedback for error field correction in RFX-mod

2011 ◽  
Vol 51 (6) ◽  
pp. 063012 ◽  
Author(s):  
L. Piron ◽  
L. Grando ◽  
G. Marchiori ◽  
L. Marrelli ◽  
P. Piovesan ◽  
...  
Keyword(s):  
Dynamic Decoupling ◽  
Error Field ◽  
Multi Mode

Rotating Plasmas

1972 ◽  
pp. 85-86
Author(s):  
D. A. Frank-Kamenetskii
Keyword(s):  
Rotating Plasmas
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