论文标题
超速中性等离子体的磁性限制
Magnetic Confinement of an Ultracold Neutral Plasma
论文作者
论文摘要
我们证明了在双尖头尖或四极磁场的零下产生的超低中性血浆（UCNP）的磁性限制。最初，UCNP由于电子热压而扩展。随着等离子体遇到更强的场，膨胀的速度和密度分布模具降低了。 UCNP电子在大多数等离子体上都被强烈磁化，而离子磁化仅在边界处有意义。观察结果表明，电子和离子主要被磁镜和双极电场捕获。限制时间接近0.5毫秒，而未磁化的等离子体会在几十微秒的时间尺度上消散。
We demonstrate magnetic confinement of an ultracold neutral plasma (UCNP) created at the null of a biconic cusp, or quadrupole magnetic field. Initially, the UCNP expands due to electron thermal pressure. As the plasma encounters stronger fields, expansion slows and the density distribution molds to the field. UCNP electrons are strongly magnetized over most of the plasma, while ion magnetization is only significant at the boundaries. Observations suggest that electrons and ions are predominantly trapped by magnetic mirroring and ambipolar electric fields respectively. Confinement times approach 0.5 ms, while unmagnetized plasmas dissipate on a timescale of a few tens of microseconds.
