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Integration of a magnetic bias field coil in a plasmoid thruster.

机译：在等离子推进器中集成磁偏置场线圈。

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The Plasmoid Thruster Experiment (PTX) is a pulsed inductive thruster design using a conical theta pinch coil to form and accelerate plasmoids. Magnetized or Compact Toroid (CT) plasmoids have closed magnetic field structures making them naturally detached from the nozzle of a space craft as well as making them candidates for fusion fueling and confinement. In order to optimize usage of plasmoids, it is important to study the formation processes.;In this study, a method for integrating a magnetic bias field with PTX was investigated. With a magnetic bias field in place at the time of ionization of the plasma propellant, the propellant would ionize on the field lines, "freezing" the field lines into the weakly ionized gas. At that point, the main capacitor bank would be discharged into the conical theta pinch coil and the rapidly increasing main magnetic field would compress and heat the ionized gas into a fully ionized plasma. As the ringing capacitor discharge changes direction, the field would rapidly reverse, forcing the frozen field lines in the plasma to tear, either controlled at the locations of x-points, or uncontrolled (resistive tearing) and reconnect with the bias field, forming a plasmoid with a self-contained field. It would then be accelerated away from the coil by the Lorentz (J x B) force. The purpose of adding an external magnetic bias field is to increase the trapped magnetic flux in order to study how this would affect the formation process and final quality of the formed plasmoids.;There are various designs that could be attempted in order to produce the magnetic bias field. The main design studied herein puts the bias field coil directly underneath the main coil using loosely wrapped wires to form the bias coil. Through Finite Element Analysis (FEA) and troubleshooting of the experimental setup, it was determined that such a design interferes with the main field to the point where any plasmoid formation becomes very difficult. Additionally, the bias coil wires are so close to the magnetic probes used to characterize formed plasmoids that interpreting the probe data becomes non-trivial due to the sharp magnetic field gradients close to the probes. The gradients stem from interaction between the main coil field, the bias coil field and the material conductivity of the bias wires.;A preliminary study of an alternate magnetic bias design was carried out in which the problems with plasmoid formation and probe interference have been solved at the expense of a much weaker bias field.
机译：等离子推力器实验（PTX）是一种脉冲感应推力器设计，它使用锥形theta收缩线圈来形成和加速等离激元。磁化或紧凑型环形（CT）等离子体均具有封闭的磁场结构，使其与航天器的喷嘴自然分离，并使它们成为聚变燃料和封闭燃料的候选者。为了优化等离子体的使用，研究其形成过程很重要。在本研究中，研究了一种将偏磁场与PTX集成的方法。在等离子推进剂电离时，在磁场偏置的情况下，推进剂将在磁力线上电离，从而将磁力线“冻结”成弱电离的气体。届时，主电容器组将被放电到锥形theta收缩线圈中，并且快速增加的主磁场将压缩并加热离子化的气体，使其成为完全离子化的等离子体。当振铃电容器放电改变方向时，磁场将迅速反转，从而迫使等离子体中冻结的场线撕裂（在x点的位置受到控制，或者不受控制（电阻撕裂））并与偏置磁场重新连接，从而形成一个等离子体具有独立的场。然后，它将在洛伦兹（J x B）力的作用下从线圈中加速离开。添加外部磁偏置磁场的目的是增加捕获的磁通量，以研究这将如何影响所形成的等离子体的形成过程和最终质量。可尝试进行多种设计以产生磁场偏置场。本文研究的主要设计是使用松散缠绕的导线将偏置磁场线圈直接置于主线圈下方，以形成偏置线圈。通过有限元分析（FEA）和对实验装置进行故障排除，可以确定这种设计会干扰主磁场，使得任何类固醇的形成都变得非常困难。另外，偏置线圈线非常靠近用来表征所形成的等离子体的磁探针，以至于由于靠近探针的尖锐的磁场梯度，解释探针数据变得不平凡。梯度来自主线圈场，偏置线圈场和偏置线的材料电导率之间的相互作用。；对替代磁偏置设计进行了初步研究，其中解决了等离子体形成和探头干扰的问题以更弱的偏置场为代价。

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