A steerable plasma microwave mirror

I. Alexeff, T. Anderson
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Abstract

We have developed a steerable plasma microwave mirror based on our previous work on the reflection of microwaves on a plasma slab. We have discovered that for plasma densities above microwave cutoff, the phase of the reflection varies continuously from a voltage antinode at the plasma surface when the plasma density just reaches microwave cutoff, to a voltage node at the plasma surface when the plasma density is much larger than that required for microwave cutoff. An analogy to the reflection at the end of a coaxial cable is that the first case corresponds to an open line (displacement and conduction currents equal and opposite), and the second case corresponds to a shorted line (conduction current much greater than displacement current). The operating plasma mirror as presently designed comprises a surface of plasma tubes. By programming the plasma density in the various tubes, the reflected microwaves experience a varying phase shift from tube to tube and the reflected beam is steered in analogy to the way an emitted microwave beam is steered by a phased transmission antenna array. The time required for reconfiguring the beam direction corresponds to the time required for plasma modification-in this case, a few milliseconds.
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可操纵等离子体微波镜
我们在研究微波在等离子体板上反射的基础上,研制了一种可操纵的等离子体微波反射镜。我们发现,对于微波截止点以上的等离子体密度,反射相位连续变化,从等离子体密度刚刚达到微波截止点时等离子体表面的电压反极,到等离子体密度远远大于微波截止点时等离子体表面的电压节点。与同轴电缆末端反射的类比是,第一种情况对应于一条开路(位移电流和传导电流相等且相反),第二种情况对应于一条短路(传导电流远大于位移电流)。目前设计的工作等离子体反射镜包括等离子体管表面。通过对不同管中的等离子体密度进行编程,反射的微波在管与管之间经历不同的相移,反射的光束被引导,类似于发射的微波光束被相控传输天线阵列引导的方式。重新配置光束方向所需的时间与等离子体修饰所需的时间相对应——在这种情况下,需要几毫秒。
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