Measurement on electron density of high-power and large-volume ICP-heated wind tunnel with HCN laser interferometer

Deng, Weifeng; Liu, Yanming; Zhang, Jia; Li, Xiaoping; Liu, Donglin; Bao, Weimin

doi:10.1063/5.0062975

Cited by 5 publications

(2 citation statements)

References 39 publications

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“…During their early stage of study, Deng et al [6] used 890 GHz HCN laser interferometer to diagnose the electron density of high enthalpy ICP heated wind tunnel. This method is non-invasive diagnosis.…”

Section: Hcn Laser Interferometermentioning

confidence: 99%

“…Li et al [9] recovered the phase shift of the electromagnetic wave in the plasma, thereby improving the diagnostic accuracy of the microwave transmission method for the device. Deng et al [6] considered the effect of pressure on the phase shift of the laser interferometer to obtain the electron density of the device. The non-contact diagnostic method doesn't interfere with the plasma, but its spatial resolution is low, and it is impossible to diagnose the local electron density of the plasma jet of the near-space experimental device.…”

Section: Introductionmentioning

confidence: 99%

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Study of plasma parameters in high enthalpy ICP-heated wind tunnel by using single Langmuir probe

Deng

Liu

et al. 2023

J. Inst.

Self Cite

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In this paper, a single probe (SP) has been designed for study plasma parameters of High enthalpy ICP-heated wind tunnel. It is found that the electron temperature in the core region is about 2.4 eV and that in the edge region is about 3–4 eV. At the maximum power of the High Enthalpy ICP-heated wind tunnel, the electron density reach 4.34 × 1013 cm-3. Meanwhile, the radial electron density distribution of SP is numerically integrated to calculate the line integral density, which is compared with the line integral density measured by 890 GHz HCN laser interferometer. The results show that the probe diagnosis results have the same trend as the laser diagnosis results. The line integral electron density measured by SP is 0.8 times higher than that measured by the HCN interferometer.

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Section: Hcn Laser Interferometermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of plasma parameters in high enthalpy ICP-heated wind tunnel by using single Langmuir probe

Deng

Liu

et al. 2023

J. Inst.

Self Cite

View full text Add to dashboard Cite

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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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Analysis of three-dimensional time-varying characteristics of subsonic plasma jet

Ding,

Liu,

Jia

et al. 2024

Physics of Plasmas

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The plasma jet wind tunnel, as a ground simulation device for studying the electromagnetic properties of near-space vehicle sheaths, can help people conduct several studies, such as communications and electronic parameter diagnostics. The plasma produced by a plasma generator has time-dependent variations due to the influence of power supply oscillations, turbulence, and other aspects of the device. To accurately define the experimental state of plasma, it is necessary to carefully analyze the three-dimensional (3D) time-varying characteristics of the plasma jet accurately since the distribution is non-uniform. This paper uses volume tomography technology to reconstruct the time series of the 3D emission field of the plasma jet with high-speed cameras. Then, the time–frequency characteristics, overall instability of the emission intensity, central axis position, and shape of the plasma jet are analyzed. The following characteristics are mainly observed: First, the plasma generator ejects plasma intermittently, which then spirals forward away from the nozzle. Second, the intensity, the radius of central axis movement, and the shape of the plasma jet vary with time at the same low frequency. The magnitude of this frequency is mainly related to the rate of change of the jet's air pressure difference with the vacuum chamber. Third, the overall instability of the plasma jet increases along the axial direction away from the nozzle and radially away from the center of the jet.

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Measurement on electron density of high-power and large-volume ICP-heated wind tunnel with HCN laser interferometer

Cited by 5 publications

References 39 publications

Study of plasma parameters in high enthalpy ICP-heated wind tunnel by using single Langmuir probe

Study of plasma parameters in high enthalpy ICP-heated wind tunnel by using single Langmuir probe

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

Analysis of three-dimensional time-varying characteristics of subsonic plasma jet

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