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一、问题的简化 为了进一步研究场反何位形的性质,需要知道等离子体截面的形状。我们的讨论是在这样一些简化假设下进行的:1)放电线圈的长度为无限大。2)等离子体为β值等于1的理想导电气体。这是由于放电初期的激波加热能使电离气体的温度迅速升高,等离子体和磁场之间有一个明显的边界面,而磁场的扩散较缓慢,可以忽略不计。因此,在放电后的一段时间内可做这样的近似处理。3)等离子体环径比较大,我们忽略其曲率效应,只考虑镜面对称柱的影
First, the problem of simplification In order to further study the nature of the field inverse position, you need to know the shape of the plasma cross-section. Our discussion is based on some simplifying assumptions: 1) The length of the discharge coil is infinite. 2) The plasma is an ideal conducting gas with β equal to 1. This is due to the fact that shock wave heating in the initial discharge rapidly increases the temperature of the ionized gas, and there is a clear boundary between the plasma and the magnetic field. The diffusion of the magnetic field is relatively slow and negligible. Therefore, this approximation can be done for a while after discharge. 3) the plasma ring diameter is relatively large, we ignore the curvature effect, only consider the shadow of mirror symmetry