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首页> 外文期刊>Plasma Sources Science & Technology >Control of electron, ion and neutral heating in a radio-frequency electrothermal microthruster via dual-frequency voltage waveforms
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Control of electron, ion and neutral heating in a radio-frequency electrothermal microthruster via dual-frequency voltage waveforms

机译：通过双频电压波形控制射频电热微生机中的电子，离子和中性加热

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摘要

The development of low power micro-propulsion sources is of recent interest for application on miniature satellite platforms. Radio-frequency (rf) plasma electrothermal microthrusters can operate without a space-charge neutralizer and provide increased control of spatiotemporal power deposition. Further understanding of how the phase-resolved rf plasma heating mechanisms affect the phase-averaged bulk plasma properties, e.g. neutral gas temperature, could allow for in-flight tailoring of plasma thrusters. In this work, experimentally validated twodimensional fluid-kinetic simulations were employed to study the spatially resolved electron and ion power deposition and neutral gas heating in a dual-frequency rf electrothermal microthruster operating at 1.5 Torr plenum pressure in argon. Experimental validation was performed through a comparison of the measured and simulated phase resolved Ar(2p1) excitation rates, showing close agreement. Two types of dual-frequency voltage waveforms were investigated, and comprise the combination of a 13.56 MHz voltage waveform with 27.12 MHz and 40.68 MHz waveforms, respectively. Varying the phase offset of the higher harmonic relative to the fundamental 13.56 MHz voltage waveform was found to modulate the dc self-bias voltage by 11% and 3% of the maximum applied peak-to-peak voltage, respectively. The 13.56 MHz, 27.12 MHz dual-frequency voltage waveform provided the highest degree of control, where the fraction of total rf power deposited into Ar+ ions was found to vary from 57% to 77%, modulating the on-axis neutral gas temperature by 35%. This control is attributed to the variation in the fraction of the rf phase cycle for which the sheath is collapsed, altering the phase-averaged electric field strength adjacent to the radial wall. The application of dual-frequency waveforms provides the ability to optimize the particle heating mechanisms with application to electrothermal propulsion.
机译：低功率微型推进源的发展是近期在微型卫星平台上应用的兴趣。射频（RF）等离子体电热微生物可以在没有空间电荷中和器的情况下操作，并提供增加的时空功率沉积的控制。进一步了解相位分辨的RF等离子体加热机制如何影响相平均体等离子体性质，例如，中性气体温度可允许飞行的等离子体推进器剪裁。在这项工作中，采用实验验证的二维流体动力学模拟来研究在氩气中的1.5托上压力下的双频RF电热微生物中的空间分辨的电子和离子功率沉积和中性气体加热。通过比较测量的和模拟相位序列AR（2P1）激励率的比较来进行实验验证，显示密切一致。研究了两种类型的双频电压波形，分别包括分别为13.56MHz电压波形的组合，分别具有27.12MHz和40.68MHz波形的组合。发现较高谐波相对于基本基本13.56MHz电压波形的相位偏移，发现分别将DC自偏置电压调制11％和3％的最大施加的峰值电压。提供了13.56MHz，27.12MHz的双频电压波形，提供了最高程度的控制，其中发现沉积在Ar +离子中的总RF功率的分数可从57％到77％变化，调节轴上的中性气体温度35 ％。该控件归因于覆盖护套的RF相循环的分数的变化，改变径向壁附近的相平方电场强度。双频波形的应用提供了利用施加到电热推进的颗粒加热机制的能力。

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