Effects of HF frequency on plasma characteristics in dual-frequency helium discharge at atmospheric pressure by fluid modeling

Wang, Yinan; Li, Shuaixing; Wang, Li; Jin, Ying; Zhang, Yanhua; Liu, Yue

doi:10.1088/2058-6272/aac71e

Cited by 2 publications

(3 citation statements)

References 29 publications

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“…[27]. According to our previous results, [20] the main ions in the atmospheric pressure helium discharge are the He + 2 ions. Thus, the cycle-averaged spatial distributions of He + 2 ion are shown in Fig.…”

Section: Resultsmentioning

confidence: 74%

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Effects of secondary electron emission on plasma characteristics in dual-frequency atmospheric pressure helium discharge by fluid modeling

Wang¹,

Li²,

Liu³

et al. 2019

Chinese Phys. B

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A one-dimensional (1D) fluid simulation of dual frequency discharge in helium gas at atmospheric pressure is carried out to investigate the role of the secondary electron emission on the surfaces of the electrodes. In the simulation, electrons, ions of He + and He + 2 , metastable atoms of He * and metastable molecules of He * 2 are included. It is found that the secondary electron emission coefficient significantly influences plasma density and electric field as well as electron heating mechanisms and ionization rate. The particle densities increase with increasing SEE coefficient from 0 to 0.3 as well as the sheath's electric field and electron source. Moreover, the SEE coefficient also influences the electron heating mechanism and electron power dissipation in the plasma and both of them increase with increasing SEE coefficient within the range from 0 to 0.3 as a result of increasing of electron density.

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Section: Resultsmentioning

confidence: 74%

“…The reactions as same as our previous work of Ref. [20] in helium gas discharge are listed in Table 1. Some assumptions of this model are taken from Ref.…”

Section: Modelmentioning

confidence: 99%

Effects of secondary electron emission on plasma characteristics in dual-frequency atmospheric pressure helium discharge by fluid modeling

Wang¹,

Li²,

Liu³

et al. 2019

Chinese Phys. B

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“…Especially, for bio-medicine applications, it is tough to make a trade-off between demands of a higher particle density and an acceptable gas temperature [18]. In order to independently control desired plasma parameters, modulation by dual frequencies (DF) and/or tailored voltage has been proposed and demonstrated to modify the power dissipation and electron dynamics, particularly the electron heating process, and thus to achieve the demanded DBD plasma parameters [19,20]. For instance, Liu et al adopted a frequency combination of 200 kHz/ 13.56 MHz to investigate the effect and mechanism of each frequency component on the DF discharge [21].…”

Section: Introductionmentioning

confidence: 99%

Electron dynamics and metastable species generation in atmospheric pressure non-equilibrium plasmas controlled by dual LF–RF frequency discharges

Zhang

Nie

et al. 2023

Front. Phys.

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In this work, we report an approach to control electron dynamics and metastable species generation and enhance the density of atmospheric pressure non-equilibrium plasmas by using dual-frequency excitation sources. The atmospheric dielectric barrier discharge (DBD) of an α-mode radio frequency (RF = 5 MHz) discharge controlled by a low-frequency (LF = 50 kHz) bias is studied based on a one-dimensional (1D) fluid model. Results show that the variation in amplitude ratio of RF and LF modulates the electron dynamic process, resulting in different spatial distributions of electron and metastable particle densities. Moreover, it is further shown that the electron density is substantially increased when the LF component voltage amplitude is larger than 300 V for the initial setting. The discharge process is characterized by fast Fourier transform of the spatio-temporal evolution of the electron power absorption and discharge current. As the LF is applied, three-wave interactions induced by LF and RF coupling are clearly observed, where the sum and beat frequencies between LF and RF are increased, which results in a substantial increase in the electron density. On the other hand, the high RF harmonics, especially for the fundamental and the third harmonic components, are suppressed when increasing the LF component. This work demonstrates that dual-frequency excitation is efficacious to modulate the electron dynamic behaviors and metastable species generation of atmospheric pressure plasma, which can provide a possible approach of optimizing plasma parameters.

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Effects of HF frequency on plasma characteristics in dual-frequency helium discharge at atmospheric pressure by fluid modeling

Cited by 2 publications

References 29 publications

Effects of secondary electron emission on plasma characteristics in dual-frequency atmospheric pressure helium discharge by fluid modeling

Effects of secondary electron emission on plasma characteristics in dual-frequency atmospheric pressure helium discharge by fluid modeling

Electron dynamics and metastable species generation in atmospheric pressure non-equilibrium plasmas controlled by dual LF–RF frequency discharges

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