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首页> 外文期刊>Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology >Numerical study on effect of external magnetic field, current profile, arc current and arc column radius on helical instabilities of arcs
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Numerical study on effect of external magnetic field, current profile, arc current and arc column radius on helical instabilities of arcs

机译：外部磁场，电流分布，电弧电流和电弧柱半径对电弧螺旋不稳定性影响的数值研究

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This model differs from previous works in that the electrical conductivity (and the current profile) is approximated in a more realistic way (parabolic instead of flat profile). The magnetohydrodynamic equations in an electrostatic approximation serve as the starting point of the theory. The effects of the external axial magnetic field, current profile, arc current and arc column radius on the helical instabilities of arcs were numerically studied. Numerical results show that the short wavelength perturbation can be stabilized by positive direction magnetic field, whereas the long wavelength perturbation can be stabilized by reverse magnetic field when the current profile is the uniform distribution. in the short wavelength perturbation case, the effect of positive direction magnetic field on the arc stability is very small when the current profile has a parabolic distribution. However, its stabilizing effect is enhanced for the long wavelength perturbation. The intermediate and long wavelength perturbation can also be stabilized by reverse magnetic field. The low current is beneficial for stabilizing arcs. (c) 2006 Elsevier Ltd. All rights reserved.
机译：该模型与以前的工作不同之处在于，电导率（和电流分布）以更实际的方式（抛物线而不是平坦的分布）进行了近似。静电近似中的磁流体动力学方程式是该理论的起点。数值研究了外部轴向磁场，电流分布，电弧电流和电弧柱半径对电弧螺旋不稳定性的影响。数值结果表明，当电流分布为均匀分布时，短波扰动可以通过正向磁场稳定，而长波扰动可以通过反向磁场来稳定。在短波扰动情况下，当电流分布具有抛物线分布时，正方向磁场对电弧稳定性的影响很小。但是，对于长波长扰动，其稳定作用得到增强。中等和长波长的扰动也可以通过反向磁场来稳定。低电流有利于稳定电弧。 （c）2006 Elsevier Ltd.保留所有权利。

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