The special numerical model of the rail-type accelerator has been used in this article with application of the variable conductivity in the surface layers of rails. In theoretical background of work, there is shown a possibility to compensate a great influence of the velocity of armature growth on the current distribution along the contact surface by gradual increase of magnetic field diffusion coefficient into the rail following with velocity increase. Assuming an armature at constant acceleration, it was possible to recalculate the local electrical conductivity of rail surface as a function of time. The numerical simulation of the nonstationary field induction penetration into electrodes of contact pair has been performed in 2-D approximation using the software Comsol v. 3.5 for velocity growth up to 2.5 km/s. The results of simulation are presented in the view of dynamic picture of induction distribution in the rails and body of armature as well as current density distribution along the contact surface. The work’s main conclusion consists of demonstration of how distribution of magnetic induction and current density can be improved due to controlled velocity of the field penetration along the contact surface of rails.

中文翻译：

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以高达 2.5 公里/秒的速度均匀加速固体电枢，在轨道表面层应用可变电导率的轨道式加速器电极的脉冲磁场穿透细节（二维模型中的数值研究）

本文采用了轨道式加速器的特殊数值模型，应用了轨道表层的可变电导率。在工作的理论背景中，通过随着速度的增加而逐渐增加进入轨道的磁场扩散系数来补偿电枢生长速度对沿接触表面的电流分布的很大影响的可能性。假设电枢处于恒定加速度，可以重新计算轨道表面的局部电导率作为时间的函数。非平稳场感应穿透接触对电极的数值模拟已使用软件 Comsol v. 3.5 以二维近似方式进行，速度增长高达 2.5 km/s。仿真结果以轨道和电枢体中感应分布的动态图以及沿接触面的电流密度分布的动态图呈现。该工作的主要结论包括演示如何通过控制沿轨道接触表面的磁场穿透速度来改善磁感应强度和电流密度的分布。