The super-Alfvénic acceleration of an extremely high beta plasmoid due to a magnetic pressure gradient is evidenced in translation experiments involving the field-reversed configuration (FRC) in the FRC amplification via the translation-collisional merging (FAT-CM) device. Inside the FRC, there is a population of unmagnetized particles that forms a volume with extremely high beta. Formed using the field-reversed theta pinch method, the FRC is accelerated and injected into a quasi-static confinement magnetic field that is weaker than the formation and acceleration fields. Because the FRC is injected with nonzero axial translation speed and cannot slow down, its speed exceeds the Alfvénic and sonic speed upon entering the confinement field. This phenomenon is predicted from two-dimensional resistive magnetohydrodynamic simulations, and experimental results that are consistent with the magnetohydrodynamic approximation show that the FRC acceleration process is due mainly to magnetic pressure on the thin magnetized layer.

中文翻译：

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磁场压力梯度导致的反向磁场超铁心加速的实验证据

在通过平移碰撞合并（FAT-CM）设备进行的FRC放大中涉及场反向构型（FRC）的平移实验中，证明了由于磁压梯度而导致的极高β等离子体的超Alfvénic加速。在FRC内部，存在大量未磁化粒子，这些粒子形成了具有极高β值的体积。使用场反转theta收缩方法形成的FRC被加速并注入到一个比形成和加速场弱的准静态约束磁场中。由于FRC的轴向平移速度非零，并且不能减速，因此进入限制区域后，其速度超过Alfvénic和声速。该现象是通过二维电阻磁流体动力学模拟预测的，