The development and propagation of the electron cyclotron drift instability are experimentally characterized in the acceleration region and near field plume of a 9kW magnetically shielded Hall thruster. High speed measurements of ion saturation current are related to plasma density oscillations in the thruster and analyzed to create spatially resolved dispersion relations. Along channel centerline, and between the exit plane of the thruster and 2.5 cm downstream, spectral power is primarily concentrated at distinct bands in the 3-20 MHz do-main, indicative of electron cyclotron resonance peaks. Beyond 2.5 cm a linear ion-acoustic like dispersion is seen up to at least 12 cm downstream. The linear wave is dominant in the E × B direction at frequencies ranging from 70-300 kHz, wavelengths between 12-53 mm, and with a phase speed of 3700 m/s. Spatially resolved power spectra show a correlation between the emergence of the linear wave and changes in wave energy at high frequencies as the instability propagates downstream from the acceleration region.
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机译：在9kW磁屏蔽霍尔推力器的加速区域和近场羽流中，对电子回旋加速器漂移不稳定性的发展和传播进行了实验表征。离子饱和电流的高速测量与推进器中的等离子体密度振荡有关，并进行分析以创建空间分辨的色散关系。沿通道中心线，在推进器的出口平面和下游2.5厘米之间，频谱功率主要集中在3-20 MHz域中的不同频带，指示电子回旋共振峰。超过2.5厘米时，在下游至少12厘米处会看到线性离子声状分散体。线性波在E×B方向上占主导地位，频率范围为70-300 kHz，波长在12-53 mm之间，并且相速为3700 m / s。在空间上解析的功率谱显示了线性波的出现与高频处的波能量变化之间的相关性，因为不稳定性从加速区域向下游传播。
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