暗空区和亮空区之间自振荡的心跳不稳定性
Heartbeat instability as auto-oscillation between dim and bright void regimes
摘要：
本文研究了射频放电复合等离子体中的自激和光电流刺激心跳不稳定性。三台摄像机同时测量微粒的运动、等离子体发射和激光诱导荧光。对心跳不稳定性的光电流控制的全面研究表明，微粒悬浮液可以通过连续激光来稳定，而调制激光束可以瞬时或共振地诱导空隙收缩。当激光调制频率与微粒悬浮液的小呼吸振荡频率一致时发生共振，这是已知的心跳不稳定性的先决条件。基于实验结果，我们认为不稳定期间的空洞收缩是由从暗区到亮区的突然空洞过渡引起的[Pikalev等人，等离子体源科学30，035014（2021）]。在明亮的制度，时间平均的电场在空隙边界加热电子，导致明亮的等离子体发射内的空隙。暗淡的空隙在边界处具有低得多的电场，并且因此没有表现出与之相关联的发射特征。
英文摘要：
We investigated the self-excited as well as optogalvanically stimulated heartbeat instability in RF discharge complex plasma. Three video cameras measured the motion of the microparticles, the plasma emission, and the laser-induced fluorescence simultaneously. Comprehensive studies of the optogalvanic control of the heartbeat instability revealed that the microparticle suspension can be stabilized by a continuous laser, whereas a modulated laser beam induces the void contraction either transiently or resonantly. The resonance occurred when the laser modulation frequency coincided with the frequency of small breathing oscillations of the microparticle suspension, which are known to be a prerequisite to the heartbeat instability. Based on the experimental results we suggest that the void contraction during the instability is caused by an abrupt void transition from the dim to the bright regime [Pikalev et al., Plasma Sources Sci. Technol. 30, 035014 (2021)]. In the bright regime, a time-averaged electric field at the void boundary heats the electrons causing bright plasma emission inside the void. The dim void has much lower electric field at the boundary and exhibits therefore no emission feature associated with it.
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