Characteristic analysis of surface waves in a sensitive plasma absorption probe

You, Wei; Li, Hong; Tan, Mingsheng; Liu, Wandong

doi:10.1063/1.5007122

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…According to whether the diagnostic equipment is involved in the plasma, microwave diagnostic methods can be divided into two types: interventional and non-interventional. Interventional microwave diagnosis methods include the microwave resonance probe [20], plasma absorption probe [21,22], plasma impedance probe [23,24], and so on. They all penetrate the tested probe deep into the plasma, so that the measured electron density has a high spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Research on plasma electron density distribution based on microwave diffraction

Zhao¹,

Li²,

Liu³

et al. 2022

Plasma Sources Sci. Technol.

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In this paper, a non-contact plasma microwave diffraction measurement method is proposed, which can obtain the electron density at different diameters of the cylindrical plasma. There is a lot of diffraction when a non-focused antenna is used to transmit plasma. As we all know, when the frequency of the incident microwave is lower than the characteristic frequency of the plasma, the microwave cannot be transmitted through the plasma, so this interface can be regarded as a metal. According to the microwave diffraction of the plasma, the size of the plasma correspond-ing to the characteristic frequency can be obtained. Furthermore, by sweeping the incident elec-tromagnetic wave, the size of plasma with different characteristic frequencies can be obtained, and the distribution of electron density can be obtained. To verify the method, a cylindrical plasma was measured by microwave diffraction, in which the electron density of the plasma column gradually decreased along the increase in radius. According to the diffraction of the plasma column at different frequencies, the distribution of the electron density along the diame-ter is obtained. And compared with the transmission diagnosis method, the validity and accuracy of this method are verified. In non-uniform high-temperature plasma, the diffraction method greatly improves the accuracy of spatial diagnosis compared with traditional transmission diag-nosis.

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Section: Introductionmentioning

confidence: 99%

Research on plasma electron density distribution based on microwave diffraction

Zhao¹,

Li²,

Liu³

et al. 2022

Plasma Sources Sci. Technol.

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show abstract

“…In recent years, the interaction between electromagnetic wave and plasma has received wide attention, for it has important applications in military, aeronautics, and industry, specifically, in plasma stealth, [1,2] communication blackout during atmospheric reentry, [3,4] and plasma diagnosis. [5,6] etc. The methods of computing the interaction of electromagnetic wave and plasma was developed by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Plasma characteristics and broadband electromagnetic wave absorption in argon and helium capacitively coupled plasma*

Ouyang¹,

Liu²,

Jin³

et al. 2021

Chinese Phys. B

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A one-dimensional self-consistent calculation model of capacitively coupled plasma (CCP) discharge and electromagnetic wave propagation is developed to solve the plasma characteristics and electromagnetic wave transmission attenuation. Numerical simulation results show that the peak electron number density of argon is about 12 times higher than that of helium, and that the electron number density increases with the augment of pressure, radio frequency (RF) power, and RF frequency. However, the electron number density first increases and then decreases as the discharge gap increases. The transmission attenuation of electromagnetic wave in argon discharge plasma is 8.5-dB higher than that of helium. At the same time, the transmission attenuation increases with the augment of the RF power and RF frequency, but it does not increase or decrease monotonically with the increase of gas pressure and discharge gap. The electromagnetic wave absorption frequency band of the argon discharge plasma under the optimal parameters in this paper can reach the Ku band. It is concluded that the argon CCP discharge under the optimal discharge parameters has great potential applications in plasma stealth.

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A diagnostic method of radial electron density distribution based on microwave transmission of cylindrical plasma along multipath

Zhao,

Li,

Gao

et al. 2024

Physics of Plasmas

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Based on the multipath propagation phase shift of electromagnetic wave in cylindrical plasma, a method to obtain the radial electron density distribution of non-uniform cylindrical plasma is proposed in this paper. Focused lens antennas are used in multipath transmission distribution diagnosis (MTDD), where the propagation area in the plasma is approximately the size of the focal spot. The equivalent propagation thickness at each layer can be calculated for each path based on the propagation region and layer thickness. Combining with Fermat's shortest wavelength principle, electromagnetic waves propagate in a straight line between different layers. The phase shift caused by the propagation of electromagnetic waves in each layer, starting from the outermost layer, can obtain layer by layer electron density. To validate the MTDD method, multipath transmission propagation phase shift was simulated in CST, and the electron density distribution was obtained, which has a good agreement with the preset electron density. In addition, the MTDD method was applied to inductively coupled plasma, and the diagnostic results showed high agreement with the Langmuir probe results. The proposed MTDD method has higher spatial resolution than the transmission diagnosis method and can provide more precise plasma parameter information.

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Characteristic analysis of surface waves in a sensitive plasma absorption probe

Cited by 4 publications

References 10 publications

Research on plasma electron density distribution based on microwave diffraction

Research on plasma electron density distribution based on microwave diffraction

Plasma characteristics and broadband electromagnetic wave absorption in argon and helium capacitively coupled plasma*

A diagnostic method of radial electron density distribution based on microwave transmission of cylindrical plasma along multipath

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