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首页> 外文期刊>Plasma physics and controlled fusion >Instantaneous current and field structure of a gun-driven spheromak for two gun polarities
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Instantaneous current and field structure of a gun-driven spheromak for two gun polarities

机译：两种枪极性的枪驱动球状球体的瞬时电流和场结构

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The instantaneous plasma structure of the SPHEX spheromak is determined here by numerically processing data from insertable Rogowski and magnetic field probes. Data is presented and compared for two modes of gun operation: with the central electrode biased positively and negatively. It is found that while the mean-, or even instantaneous-, field structure would give the impression of a roughly axisymmetric spheromak, the instantaneous current structure does not. Hundred per cent variations in J measured at the magnetic axis can be explained by the rotation of a current filament that has a width equal to half of the radius of the flux-conserving first wall. In positive gun operation, current leaves the filament in the confinement region leading to high wall current there. In negative gun operation, wall current remains low as all injected current returns to the gun through the plasma. The plasma, in either instance, is strongly asymmetric. We discuss evidence for the existence of the current filament in other gun-driven spheromaks and coaxial plasma thrusters. [References: 35]
机译：SPHEX spheromak的瞬时等离子体结构在此通过对可插入式Rogowski和磁场探头的数据进行数值处理来确定。给出并比较了两种枪支操作模式的数据：中心电极正偏和负偏。已经发现，尽管平均或什至瞬时的场结构会给人以大致轴对称的球面的印象，但瞬时电流结构却没有。可以通过电流灯丝的旋转来解释在磁轴上测量到的J百分百变化，该电流灯丝的宽度等于保持通量的第一壁的半径的一半。在正向喷枪操作中，电流使灯丝离开限制区域，从而导致那里的壁高电流。在负喷枪操作中，由于所有注入电流都通过等离子体返回到喷枪，所以壁电流保持较低。在任何一种情况下，等离子体都是非常不对称的。我们讨论了其他枪支驱动的单引信子和同轴等离子推进器中当前灯丝的存在的证据。 [参考：35]

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