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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >High density mode in xenon produced by a Helicon Double Layer Thruster
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High density mode in xenon produced by a Helicon Double Layer Thruster

机译：Helicon双层推进器产生的氙气高密度模式

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摘要

A high density 'blue' mode has been observed when operating the Helicon Double Layer Thruster (HDLT) with xenon. Using a Langmuir probe and a retarding field energy analyser (RFEA), the plasma source and exhaust have been characterized at various radio frequency (RF) powers and operating pressures. When operating at low RF powers, the HDLT prototype is shown to be in a capacitively coupled mode. As the RF power is increased, a discrete mode transition occurs over a small RF power range (at about 625 W at 0.45 mTorr) and the plasma inside the source increases in density significantly and changes to a bright white/blue colour. This high density mode exhibits hysteresis, and radial measurements inside the source reveal a centrally peaked profile that is indicative of a helicon wave-sustained discharge. The quality, or Q, factor of the matching box is determined as a function of RF power and is shown to decrease in the high density mode, consistent with the increase in plasma density observed. The xenon exhaust of the HDLT prototype is investigated axially with the Langmuir probe and the RFEA and is shown to follow a Boltzmann expansion with an electron temperature of about 6 eV.
机译：在带有氙气的Helicon双层推进器（HDLT）上观察到高密度的“蓝色”模式。使用Langmuir探针和延迟场能量分析仪（RFEA），已经在各种射频（RF）功率和工作压力下表征了等离子体源和排气。当以低RF功率工作时，HDLT原型显示为处于电容耦合模式。随着RF功率的增加，在较小的RF功率范围（0.45 mTorr时约为625 W）上发生离散模式转换，并且源内部的等离子体密度显着增加，并变为亮白色/蓝色。这种高密度模式显示出磁滞现象，并且放射源内部的径向测量结果显示出中心峰值轮廓，该轮廓表明了螺线波持续放电。确定匹配盒的质量或Q因子是RF功率的函数，并且显示为在高密度模式下降低，这与观察到的等离子体密度的增加一致。用Langmuir探针和RFEA轴向研究了HDLT原型机的氙气排放，并证明其遵循玻尔兹曼膨胀且电子温度约为6 eV。

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