Study of the Discharge Mode in Micro-Hollow Cathode

He, Feng; He, Shoujie; Zhao, Xiaofei; Guo, Baoping; Ouyang, Jiting

doi:10.1088/1009-0630/14/12/08

Cited by 5 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With a current lower than 7.5 mA, the voltagecurrent curve presents a similar trend with that of the covered MHCD. However, with a current higher than 7.5 mA, V g slightly decreases first and then remains almost constant with increasing current, which is similar to the phenomenon reported by others [46][47][48]. The constant V g with varying current results from the plasma extending outside the cathode hole [19,26,27].…”

Section: Resultssupporting

confidence: 87%

Numerical simulation on the characteristics of a micro-hollow cathode discharge with external surface of the cathode covered by a dielectric layer

Jia

Ran²,

Wu³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Being able to generate a plasma denser than that in the usual micro-hollow cathode discharge device (MHCD), a MHCD with the cathode outer surface covered by a dielectric layer has been numerically simulated in atmospheric pressure helium with a two-dimensional fluid model in this paper. Results indicate that before reaching a steady state, the covered MHCD sequentially undergoes three phases. In the initial phase, a strong discharge and a weak discharge appear in the vicinities of the cathode and the anode, respectively. Then, a positive streamer propagates along the axis from the anode to the cathode. After that, the entire gap between the two electrodes is filled with discharges. In addition, the evolution of averaged densities is given for various species. Moreover, voltage and current curves are compared for the covered and uncovered MHCDs in the steady state. As expected, the covered MHCD has an averaged electron density higher than that of the uncovered MHCD in the steady state. These results are helpful in generating an atmospheric pressure plasma with high electron density, which is important for the extensive applications of MHCD.

show abstract

Section: Resultssupporting

confidence: 87%

Numerical simulation on the characteristics of a micro-hollow cathode discharge with external surface of the cathode covered by a dielectric layer

Jia

Ran²,

Wu³

et al. 2022

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…Figure 2(b) illustrates the mesh distribution used in the simulation. The numerical scheme of this model was described in reference [27].…”

Section: Simulation Modelmentioning

confidence: 99%

Study on the characteristics of helium plasma jet by pulsed micro-hollow cathode discharge

Duan¹,

Li²,

He³

et al. 2021

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

In this paper, the helium plasma jet generated by micro-hollow cathode discharge (MHCD) was studied. The MHCD was driven by a square-wave pulsed power source, and the characteristics of discharge and plasma jet were measured experimentally. The influences of the gas flow rate on the MHCD and the plasma jet were investigated. And the propagation mechanisms of the plasma jet were analyzed. The results show that within 100–1000 sccm of the gas flow rate, the breakdown delay time of the MHCD increases with the helium flow increasing. It is considered that the gas flow affects the density of seed electrons and thus the breakdown delay time. With the helium flow rate increasing, the whole plasma jet length increases firstly and then decreases. A detailed investigation shows that during one discharge pulse, two distinguishable propagation processes of the plasma jet are observed. It is found that the jet of the first stage is formed during the rising edge of the current pulse, while the other is generated after the discharge current becomes stable. The propagation velocity of jet in the first stage is on the order of several km s−1, which is similar to that of the discharge evolution obtained by simulation. And the propagation speed of the jet in the second stage is on the order of several hundred m s−1, which is close to the velocity of gas flow. The spatial–temporal distributions of light emission show that high-energy electrons can only be observed during the jet propagation in the first stage, and low-energy electrons can be detected in both the first and second stages. The results show that the electric field plays an important role on the jet propagation in the first stage, and the jet propagation during the second stage is mainly promoted by the thermal gas expansion.

show abstract

Study of self‐organised criticality in a coaxial plasma source with gridded cathode

Bose

Paul

2022

Contributions to Plasma Physics

View full text Add to dashboard Cite

Multiple luminous sheath structures develop in the localised plasma formation inside a cylindrical gridded cathode plasma source. These structures gradually expand into the whole vessel and undergo a critical state through self‐organised criticality (SOC) along with pronounced sheath oscillations during the variation of anode potential. The present investigation emphasises the stability properties associated with the oscillations of the sheath potential structures in the cylindrical‐gridded cathode in glow discharge regime through SOC phenomena through non‐linear time series analysis. The non‐linear temporal and spatial analysis of potential structure and dynamics of charged particles are correlated with SOC in cylindrical‐gridded cathode in glow discharge regime through the dynamics of multiple sheath structure formations. The existence of flicker noise and long‐range correlation in the time series suggests the existence of SOC behaviour in the system, the multiple sheath structures evolve through reduction and addition of layers. Cylindrical‐gridded cathode discharge initiation during formations of multiple sheath structures, switching of discharge regimes with anode potential, layer reduction and addition inside the sheath structures through SOC behaviour, renders uniqueness to the present regime of investigation. Self‐organised pattern formations and self‐organised criticality behaviour investigated in the present glow discharge regime using the cylindrical‐gridded cathode source are of prime importance to understand the complex behaviour of plasmas in the field of hollow cathode discharges.

show abstract

Study of the Discharge Mode in Micro-Hollow Cathode

Cited by 5 publications

References 17 publications

Numerical simulation on the characteristics of a micro-hollow cathode discharge with external surface of the cathode covered by a dielectric layer

Numerical simulation on the characteristics of a micro-hollow cathode discharge with external surface of the cathode covered by a dielectric layer

Study on the characteristics of helium plasma jet by pulsed micro-hollow cathode discharge

Study of self‐organised criticality in a coaxial plasma source with gridded cathode

Contact Info

Product

Resources

About