Validity of the similarity law for the glow discharges in non-plane-parallel gaps

Fu, Yangyang; Luo, Haiyun; Zou, Xiaobing; Wang, Xinxin

doi:10.1088/0963-0252/23/6/065035

Cited by 18 publications

(13 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is assumed that electrons, excited atoms, and ions become attached to the surface of the non-cathode wall. 31,32 The electric potential u is obtained from u¼U 0 -IÁR b at the anode (where I is the total discharge current) and u ¼ 0 at the cathode.…”

Section: Model Descriptionmentioning

confidence: 99%

Transition characteristics of low-pressure discharges in a hollow cathode

Verboncoeur

Christlieb

et al. 2017

Physics of Plasmas

Self Cite

View full text Add to dashboard Cite

Based on a two-dimensional (2-D) fluid model, the transition processes of discharges in a hollow cathode at low pressure are observed by changing three parameters, i.e., applied voltage U 0 , gas pressure p, and external circuit ballast resistance R b. The voltage-current characteristic curves, electron density distributions, and electric potential distributions of different discharge operating points in a hollow cathode are obtained. The transition processes are characterized by the voltage-current characteristic curves, the electron density distributions, and the electrical potential distributions. The transition modes observed from the voltage-current characteristics include the low-current abnormal mode, normal mode, and high-current abnormal mode. Increasing the applied voltage U 0 can have a similar effect on the discharge transition processes to decreasing the ballast resistance. By increasing U 0 from 200 V to 500 V and decreasing R b from 5000 kX to 100 kX independently, it is observed that the discharge transfers from the outside to the inside of the hollow cavity, thus forming the virtual anode potential. By increasing the gas pressure p from 50 Pa to 5 kPa, the discharge also moves into the hollow cavity from the outside; however, a further increase in the gas pressure leads to the discharge escaping from the hollow cavity. Simulation results and characterizations for different parameters are presented for the transition properties of low-pressure discharges in a hollow cathode. It is verified that the hollow cathode discharge only exists under certain ranges of the above parameters. Published by AIP Publishing.

show abstract

Section: Model Descriptionmentioning

confidence: 99%

Transition characteristics of low-pressure discharges in a hollow cathode

Verboncoeur

Christlieb

et al. 2017

Physics of Plasmas

Self Cite

View full text Add to dashboard Cite

show abstract

“…30 This results from the similarity laws are more commonly applied in discharges in low-pressure regimes. [32][33][34][35][36] However, for the high-pressure discharges, some other physical mechanisms, such as three-body collisions and dissociative recombination, become considerable so that the applicability of the similarity law is not straightforward. No matter what the discharge mechanisms are, the requirements of the similarity law on the particle productions from different physical processes are the same, which can be generally derived from the similarity relations in Table I.…”

Section: Similarity Laws and Discharge Processesmentioning

confidence: 99%

“…In our previous studies, validity of the similarity law has been confirmed in the lowpressure discharges, where many other nonlinear processes, such as the three-body collision and recombination, are of less importance. [34][35][36]…”

Section: Similarity Laws and Discharge Processesmentioning

confidence: 99%

Investigation on the effect of nonlinear processes on similarity law in high-pressure argon discharges

Parsey

Verboncoeur

et al. 2017

Physics of Plasmas

Self Cite

View full text Add to dashboard Cite

In this paper, the effect of nonlinear processes (such as three-body collisions and stepwise ionizations) on the similarity law in high-pressure argon discharges has been studied by the use of the Kinetic Global Model framework. In the discharge model, the ground state argon atoms (Ar), electrons (e), atom ions (Ar þ ), molecular ions (Ar 2 þ ), and fourteen argon excited levels Ar*(4s and 4p) are considered. The steady-state electron and ion densities are obtained with nonlinear processes included and excluded in the designed models, respectively. It is found that in similar gas gaps, keeping the product of gas pressure and linear dimension unchanged, with the nonlinear processes included, the normalized density relations deviate from the similarity relations gradually as the scale-up factor decreases. Without the nonlinear processes, the parameter relations are in good agreement with the similarity law predictions. Furthermore, the pressure and the dimension effects are also investigated separately with and without the nonlinear processes. It is shown that the gas pressure effect on the results is less obvious than the dimension effect. Without the nonlinear processes, the pressure and the dimension effects could be estimated from one to the other based on the similarity relations. Published by AIP Publishing. https://doi.

show abstract

“…The relations between the physical quantities and some physical phenomena can not be explained strictly. Most authors use numerical methods in the theoretical study [7][8][9][10][11][12][13][14]. With the development of computer and algorithm optimization, these methods provide a good foundation and guarantee with great achievements made in this field.…”

Section: Introductionmentioning

confidence: 99%

DC Glow Discharge in Axial Magnetic Field at Low Pressures

Gao

Shixiu

et al. 2017

Advances in Mathematical Physics

View full text Add to dashboard Cite

On the basis of fluid approximation, an improved version of the model for the description of dc glow discharge plasma in the axial magnetic field was successfully developed. The model has yielded a set of analytic formulas for the physical quantities concerned from the electron and ion fluids equations and Poisson equation. The calculated results satisfy the practical boundary conditions. Results obtained from the model reveal that although the differential equations under the condition of axial magnetic field are consistent with the differential equations without considering the magnetic field, the solution of the equations is not completely consistent. The results show that the stronger the magnetic field, the greater the plasma density.

show abstract

Validity of the similarity law for the glow discharges in non-plane-parallel gaps

Cited by 18 publications

References 31 publications

Transition characteristics of low-pressure discharges in a hollow cathode

Transition characteristics of low-pressure discharges in a hollow cathode

Investigation on the effect of nonlinear processes on similarity law in high-pressure argon discharges

DC Glow Discharge in Axial Magnetic Field at Low Pressures

Contact Info

Product

Resources

About