Predicting plasma properties using power‐controllable fluorescent lamps under electromagnetic wave radiation

Lai, Ying-Xin; Chen, Fangyuan; Tang, Zhengming; Zhang, Wencong; Liu, Yufeng

doi:10.1002/mmce.22265

Cited by 3 publications

(6 citation statements)

References 27 publications

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“…In order to simplify the problem, the plasma is assumed to be homogeneous which is a common assumption in theoretical and experimental studies of EM wave propagation in bounded plasma. [ 30,31,39 ] It is also considered that the plasma is partially ionized and the electron‐neutral collision is the predominant collision type which can be expressed as follows. [ 6,27,39,40 ]

{\nu}_{en}={N}_0{\sigma}_{en}\sqrt{\frac{k_B{T}_e}{m_e}},\kern2em 0<T<10\kern0.5em \mathrm{eV},

where

{k}_B

is the Boltzmann constant,

{N}_0

and

{\sigma}_{en}

are density of gas molecules and elastic collision cross‐section of electrons, respectively.…”

Section: Numerical Simulation and Resultsmentioning

confidence: 99%

“…[ 28 ] Recently, some experimental methods were developed to predict plasma properties with the aid of microwave propagation in low‐temperature plasma. [ 29–31 ]…”

Section: Introductionmentioning

confidence: 99%

“…[28] Recently, some experimental methods were developed to predict plasma properties with the aid of microwave propagation in low-temperature plasma. [29][30][31] In many diagnostic facilities such as microwave reflectometers, substantial irregularities in the reflected signal are observed, mainly due to density fluctuations or scattering of the EM wave from the reflection (cut-off) layer of the plasma. Such fluctuations of the received (reflected) signal, in the vicinity of the cut-off layer, can cause significant errors in phase detection, especially in homodyne microwave systems.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of near cut‐off properties of electromagnetic wave propagation in homogeneous, collisional plasma slab

Noori

2022

Contributions to Plasma Physics

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Fluctuations in the signal of optical coefficients of propagative electromagnetic (EM) waves in plasma, can cause problems in phase analysis, especially in microwave diagnostic systems which are based on the reflection, and transmission of EM waves in the vicinity of cut-off layer of the plasma. In this study, optical properties of EM wave propagation in a single layer, homogeneous, and partially ionized plasma slab are investigated. For realistic analysis of propagation characteristics of the EM wave in the plasma slab, multiple reflections of the EM wave from plasma-vacuum boundaries, known as incoherent internal reflections (IIR) are considered. Optical coefficients of the EM wave are numerically simulated in terms of the plasma parameters and wave frequency, with and without consideration of the incoherent internal reflections effect. It was found that in the low-loss collision regime, the cut-off fluctuations of the optical coefficients can be filtered considering the incoherent internal reflections of the EM wave. Such analysis of the EM wave propagation in plasma slab can be considered the primary physical design of diagnostic facilities and EM wave absorbing structures operating in the cut-off frequency ranges.

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{\nu}_{en}={N}_0{\sigma}_{en}\sqrt{\frac{k_B{T}_e}{m_e}},\kern2em 0<T<10\kern0.5em \mathrm{eV},

where

{k}_B

is the Boltzmann constant,

{N}_0

and

{\sigma}_{en}

are density of gas molecules and elastic collision cross‐section of electrons, respectively.…”

Section: Numerical Simulation and Resultsmentioning

confidence: 99%

“…[ 28 ] Recently, some experimental methods were developed to predict plasma properties with the aid of microwave propagation in low‐temperature plasma. [ 29–31 ]…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of near cut‐off properties of electromagnetic wave propagation in homogeneous, collisional plasma slab

Noori

2022

Contributions to Plasma Physics

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“…1 and the definition of the complex refractive index (Eq. 3), the propagation and attenuation constants of the EM wave can be written as [9,24,25] (4)…”

Section: Physical Formulation Of the Problemmentioning

confidence: 99%

“…In many microwaves diagnostic facilities which operate in the cut-off frequency range of the plasma, the plasma medium can cause mismatching of the transmitted signal into the cutoff layers [21,22,23]. In addition, in partially ionized plasma, inter-particle collisions can seriously affect the transmission and reflection properties of the propagated EM wave of microwave range through the plasma [23,24,25,26]. Therefore, the effect of the collision on microwave propagation is of great importance in the case of medium-density plasma for systems such as microwave reflectometers which operate below the cut-off frequency of the plasma.…”

Section: Introductionsmentioning

confidence: 99%

Plasma Mismatching with Microwave Transmission Characteristics for Diagnostic Purposes

Noori

2023

Jonra

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Many remote diagnostic systems rely on the transmission and reflection of electromagnetic waves. In diagnostics facilities such as microwave reflectometers which operate in the cut-off frequency range, the collisionality of the plasma can affect the transmission and reflection characteristics of electromagnetic waves. In this paper, plasma mismatching and reflection properties of microwave propagation through partially ionized, uniform, and cold plasma were studied. Using the simplified Lorentz model of the plasma and associated dispersion relation of electromagnetic wave propagation through collisional, cold plasma, propagation characteristics of the electromagnetic waves were investigated in different collisional regimes of single-interface and double-interface, bounded plasma. It was found that in the cut-off frequency range, the propagation coefficients of the electromagnetic wave can be significantly affected depending on the collision frequency of the plasma. It was also found that in the double-interface case, the thickness of the plasma can cause multiple reflections in the plasma slab, and such reflections can be suppressed in the high-loss collisional regime.

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Modulation of Microwave Reflection by Grid Electrode DC Glow Discharge

Li,

Lyu,

Yuan

et al. 2024

2024 Photonics &Amp; Electromagnetics Research Symposium (PIERS)

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Predicting plasma properties using power‐controllable fluorescent lamps under electromagnetic wave radiation

Cited by 3 publications

References 27 publications

Investigation of near cut‐off properties of electromagnetic wave propagation in homogeneous, collisional plasma slab

Investigation of near cut‐off properties of electromagnetic wave propagation in homogeneous, collisional plasma slab

Plasma Mismatching with Microwave Transmission Characteristics for Diagnostic Purposes

Modulation of Microwave Reflection by Grid Electrode DC Glow Discharge

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