During a long-term discharge of a Hall thruster, local overheating on the anode surface occurs and its location shifts randomly. The asymmetrical supply of anode potential is thought to be the cause. To investigate their relationship, a bias voltage is applied on one piece of a quartered anode to realize the asymmetrical supply of anode potential. Variations of both the current and temperature of each anode piece are measured and analyzed. The results indicate that the disruption of the anode potential symmetrical supply does not affect the total anode current; however, it enhances the current oscillation. As the bias voltage increases, the current concentrates gradually on the high-potential part of the anode, accompanied by an increase in the local temperature. Changes in the E_z × B_r drift direction, magnetic field strength, discharge voltage, and anode flow rate do not affect the above-mentioned laws. Preliminary analysis shows that the formation of a local electric field near the anode and the generation of an extra E_θ × B_r drift are the main causes, which can affect the movement of electrons in the near-anode region greatly.

中文翻译：

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阳极电位对称电源中断对霍尔推进器放电的影响

在霍尔推力器长期放电期间，阳极表面会发生局部过热，并且其位置会随机移动。阳极电位的不对称供给被认为是原因。为了研究它们之间的关系，将偏压施加在一个四分之一阳极上，以实现阳极电势的不对称供应。测量并分析每个阳极片的电流和温度的变化。结果表明，阳极电势对称电源的中断不影响总阳极电流。但是，它会增加电流振荡。随着偏置电压的增加，电流逐渐集中在阳极的高电位部分，并伴随着局部温度的升高。在变化ë _ž ×乙_r漂移方向，磁场强度，放电电压和阳极流量均不影响上述定律。初步分析表明，在阳极附近的局部电场和一个额外的产生的形成ë _θ ×乙_ř漂移是主要的原因，这会影响在近阳极区的电子的运动很大。