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Poloidal field amplification in a coaxial compact toroid accelerator

机译：同轴紧凑环形加速器中的极向场放大

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The Compact Toroid Injection Experiment (CTIX) produces spheromak-like compact toroids (SCTs) without external power switching, initiating a discharge by pulsed gas injection into a formation region containing a seed magnetic field generated by a solenoidal coil. After formation, the plasma is driven by an inductively delayed capacitor bank into an acceleration region, where surface axial and toroidal magnetic fields are measured at several axial positions. Due to strong eddy-current effects, formation-region magnetic field cannot be simply computed; instead, it is measured using the response of axial and radial test coils in the formation region to short solenoid test current pulses. A temporal and spatial reconstruction method is developed allowing formation-region field to be computed from the test-coil data for any CTIX discharge of identical solenoid geometry. By varying the peak value and timing of solenoidal current, curves of peak accelerator-region field as a function of initial formation-region field are developed. Curves of peak accelerator-region axial magnetic field are thereby found to be highly nonlinear functions of formation-region field, showing a threshold value for the formation-region field of approximately 5 G, above which acceleration-region field saturates at values between 2 and 12 kG. The direction of acceleration-region axial field reverses sign when the direction of solenoid current is reversed. Saturated accelerator-region axial field is a function of axial position and accelerator voltage, and is typically comparable to toroidal field at the same location. The ratio of accelerator-region to formation-region axial field commonly exceeds 1000 near the onset of saturation. This large amplification is of practical advantage for delayed plasma breakdown on CTIX, allowing a modest seed field to produce high poloidal fields, which are necessary for intense SCT acceleration. The results may also provide a useful benchmark for numerical simulation of the conversion of abundant toroidal field into poloidal field in a plasma with comparatively low dissipation.
机译：紧凑型环形注入实验（CTIX）无需外部电源切换即可产生类似于球形的紧凑型环形（SCT），通过脉冲气体注入到包含由螺线管线圈产生的种子磁场的形成区域中启动放电。形成后，等离子体由感应延迟的电容器组驱动进入加速区，在该加速区中在多个轴向位置测量表面轴向磁场和环形磁场。由于强烈的涡流效应，不能简单地计算出形成区域的磁场。相反，它是使用形成区域中的轴向和径向测试线圈对短螺线管测试电流脉冲的响应进行测量的。开发了一种时间和空间重构方法，允许从相同螺线管几何形状的任何CTIX放电的测试线圈数据计算地层区域场。通过改变螺线管电流的峰值和时间，可以得出加速器峰值场磁场随初始形成区域场的变化曲线。因此，发现加速器区域轴向磁场的峰值曲线是形成区域场的高度非线性函数，显示了大约5 G的形成区域场的阈值，在该阈值之上，加速区域场在2至2之间的值处饱和。 12公斤当螺线管电流的方向反向时，加速区轴向磁场的方向也将反向。加速器区域的饱和轴向磁场是轴向位置和加速器电压的函数，通常可与相同位置的环形磁场相比。在饱和开始附近，加速器区域与地层区域轴向磁场之比通常超过1000。如此大的放大对于延迟CTIX上的等离子体破裂具有实际优势，允许适度的种子场产生高倍数场，这对于强烈的SCT加速是必不可少的。该结果还可以为在具有相对较低耗散的等离子体中将大量环形场转换为极场的数值模拟提供有用的基准。

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