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>Role of Negative Potential Barrier Formed by Electrons Confined in the Stochastic Magnetic Region of Helical Nonneutral Plasmas
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Role of Negative Potential Barrier Formed by Electrons Confined in the Stochastic Magnetic Region of Helical Nonneutral Plasmas
Nonneutral plasmas confined in the helical magnetic surface (HMS) region can be produced by injecting electrons from outside the last closed flux surface (LCFS). Recently, we numerically calculated outward electron orbits that extend to the inner HMS region. Once it penetrates the HMS region, the injected electron is never lost to the chamber wall, because the negative self-electric potential φs in the stochastic magnetic region (SMR) acts as a potential barrier. Remarkably, during the reflection process at the potential barrier, the electron is still trapped in the foot of the negative φs region, although it completely overcomes the SMR. The electron then resumes inward movement across the HMS.
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机译：可以通过从最后一个封闭磁通面（LCFS）外部注入电子来产生局限于螺旋磁表面（HMS）区域的非中性等离子体。最近，我们通过数值计算了延伸到内部HMS区域的向外电子轨道。一旦它穿过HMS区域，注入的电子就永远不会丢失到腔室壁上，因为随机磁区（SMR）中的负自电势φ s 充当势垒。值得注意的是，在势垒的反射过程中，电子虽然完全克服了SMR，但仍然被俘获在φ s 负区域的底部。然后，电子通过HMS恢复向内移动。
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