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To further explore the mechanism of self-pulsing discharge, a sandwiched microcavity cathode is used to study this phenomenon in argon. With the increases of discharge current, the discharge undergoes Townsend discharge, self-pulsing discharge and normal glow discharge. A complete self-pulsing discharge consists of the rising edge, the falling edge of the discharge current, and the waiting period of the discharge. The spatiotemporal dynamic characteristic of self-pulsing discharge is simulated by using a fluid model. The simulated results indicate that when the self-pulsing discharge current reaches its minimum value, the discharge is confined inside the cathode cavity. The electric field, electron density and electron generate rate are low, resulting in a Townsend discharge mode. As the discharge current increases, the discharge inside the cavity is strengthened, and the discharge gradually extends from the inside of the cavity to the outside. When the current reaches its maximum value, there exists a strong discharge outside the cavity, and an obvious cathode sheath is formed near the outer surface of the cathode, resulting in a high electron generate rate outside the cavity. When the discharge current decreases, the discharge shrinks from the outside to the inside of the cavity, and finally returns to the Townsend discharge mode. The simulated results also indicate that the ionization source varies depending on the stage of self-pulsing discharge, specifically, direct ionization is dominant when the current is high, and Penning ionization plays a major role in the pulse waiting period when the current reaches its minimum value. The experimental and simulation results indicate that the self-pulsing discharge in a micro-cavity cathode is essentially a process of mode transition between the Townsend discharge mode where the discharge is confined within the cavity and the normal glow discharge mode where the discharge region extends to the outside of the hole.
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Keywords:
- self-pulsing discharge /
- hollow cathode discharge /
- mode transition /
- fluid model
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图 1 实验装置示意图
Figure 1. Schematic diagram of the experimental setup.
图 2 伏安特性曲线图
Figure 2. Voltage-current curve.
图 3 不同放电模式下放电图像(红线小圆: 微孔; 红线大圆: 电极片)
Figure 3. The discharge images at different discharge modes (small red circle: cavity, large red circle: cathode electrode).
图 4 平均电流250 μA时的电压和电流脉冲波形图
Figure 4. Voltage and current pulse waveforms at an average current of 250 μA.
图 5 自脉冲频率随平均电流变化
Figure 5. The self-pulsing frequency as a function of average discharge current.
图 6 不同稳态放电模式下电子密度 (a)汤生放电模式I = 20 μA; (b)正常辉光放电模式I = 3000 μA
Figure 6. Electron density at different stable discharge modes: (a) Townsend discharge at I = 20 μA; (b) normal glow discharge I = 3000 μA.
图 7 稳态放电模式下z = –2.5 mm处一维径向电场
Figure 7. One dimensional radial electric field at z = –2.5 mm in stable discharge mode.
图 8 自脉冲放电电流模拟波形. tA = 58.9 μs, tB = 118.1 μs, tC = 131.3 μs, tD = 132.1 μs, tE = 146.3 μs
Figure 8. The simulated discharge current waveform. tA = 58.9 μs, tB = 118.1 μs, tC = 131.3 μs, tD = 132.1 μs, tE = 146.3 μs.
图 9 不同时刻电势分布图 (a) 58.9 μs; (b) 118.1 μs; (c) 131.3 μs; (d) 132.1 μs; (e) 146.3 μs
Figure 9. Electric potential at different time: (a)58.9 μs; (b) 118.1 μs; (c) 131.3 μs; (d) 132.1 μs; (e) 146.3 μs.
图 10 不同时刻电子密度分布图 (a) 58.9 μs; (b) 118.1 μs; (c) 131.3 μs; (d) 132.1 μs; (e) 146.3 μs
Figure 10. Electron density distribution at different time: (a) 58.9 μs; (b) 118.1 μs; (c) 131.3 μs; (d) 132.1 μs; (e) 146.3 μs.
图 11 不同时刻z = –2.5 mm处径向电场分布图
Figure 11. Radial electric field distribution at z = –2.5 mm at different time.
图 12 极间电压270 V时放电电流随时间变化图
Figure 12. Discharge current evolution with time at a voltage of 270 V.
图 13 不同时刻电子产生速率分布图 (a) 58.9 μs; (b) 118.1 μs; (c) 131.3 μs; (d) 132.1 μs; (e) 146.3 μs
Figure 13. Electron generation rate at different times: (a) 58.9 μs; (b) 118.1 μs; (c) 131.3 μs; (d) 132.1 μs; (e) 146.3 μs.
图 14 脉冲电流和不同电离速率时间演化图
Figure 14. The evolution of pulse current and different ionization rates with time.
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