Numerical Studies of the Propagation of High-Power Damped Sine Microwave Pulse in the Atmosphere

Zhao, Pengcheng; Liao, Cheng; Lin, Wenbin

doi:10.1163/156939311798806130

Cited by 10 publications

(14 citation statements)

References 22 publications

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“…[8] Because of its simplicity and speed, the fluid model has been widely used in the simulation of the gas breakdown by the HPM. [9,10] In the fluid model, the electron energy distribution function (EEDF), which is an important parameter to calculate the transport coefficients (ionization frequency, collision frequency, and electron energy loss frequency), is often assumed to be a Maxwellian one. However, this assumption could lead to poor predictions of the gas breakdown if the EEDF deviates noticeably from the equilibrium.…”

Section: Introductionmentioning

confidence: 99%

Validity of the two-term Boltzmann approximation employed in the fluid model for high-power microwave breakdown in gas

Zhao¹,

Liao²,

Yang³

et al. 2014

Chinese Phys. B

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The electron energy distribution function (EEDF), predicted by the Boltzmann equation solver BOLSIG+ based on the two-term approximation, is introduced into the fluid model for simulating the high-power microwave (HPM) breakdown in argon, nitrogen, and air, and its validity is examined by comparing with the results of particle-in-cell Monte Carlo collision (PIC/MCC) simulations as well as the experimental data. Numerical results show that, the breakdown time of the fluid model with the Maxwellian EEDF matches that of the PIC/MCC simulations in nitrogen; however, in argon under high pressures, the results from the Maxwellian EEDF were poor. This is due to an overestimation of the energy tail of the Maxwellian EEDF in argon breakdown. The prediction of the fluid model with the BOLSIG+ EEDF, however, agrees very well with the PIC/MCC prediction in nitrogen and argon over a wide range of pressures. The accuracy of the fluid model with the BOLSIG+ EEDF is also verified by the experimental results of the air breakdown.

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Section: Introductionmentioning

confidence: 99%

Validity of the two-term Boltzmann approximation employed in the fluid model for high-power microwave breakdown in gas

Zhao¹,

Liao²,

Yang³

et al. 2014

Chinese Phys. B

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“…The transport coefficients are important to describe the interaction of neutral molecules (atoms) and the electrons accelerated by the HPM, as shown in Eqs. ( 4)- (7). The common method for calculating these coefficients is to integrate the collision cross section [16] over the EEDF.…”

Section: Model and Methodsmentioning

confidence: 99%

“…The HPM breakdown in gas has been studied by many investigators. [4][5][6][7][8] These studies focus mainly on the gas breakdown driven by the continuous wave or the rectangular microwave pulses. So far, we know very little about the case of the short pulses, such as the Gaussian pulse, modulated Gaussian pulse, differentiated Gaussian pulses, and fast rise-time pulse, which are often generated in experiments.…”

Section: Introductionmentioning

confidence: 99%

Short-pulse high-power microwave breakdown at high pressures

2015

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The fluid model is proposed to investigate the gas breakdown driven by a short-pulse (such as a Gaussian pulse) high-power microwave at high pressures. However, the fluid model requires specification of the electron energy distribution function (EEDF); the common assumption of a Maxwellian EEDF can result in the inaccurate breakdown prediction when the electrons are not in equilibrium. We confirm that the influence of the incident pulse shape on the EEDF is tiny at high pressures by using the particle-in-cell Monte Carlo collision (PIC-MCC) model. As a result, the EEDF for a rectangular microwave pulse directly derived from the Boltzmann equation solver Bolsig+ is introduced into the fluid model for predicting the breakdown threshold of the non-rectangular pulse over a wide range of pressures, and the obtained results are very well matched with those of the PIC-MCC simulations. The time evolution of a non-rectangular pulse breakdown in gas, obtained by the fluid model with the EEDF from Bolsig+, is presented and analyzed at different pressures. In addition, the effect of the incident pulse shape on the gas breakdown is discussed.

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“…The propagation of the HPM pulse in air has been studied by many investigators, and the air breakdown mainly depends on air pressure and frequency, width and amplitude of the HPM pulse [8][9][10][11]. Besides, a lot of work has been done to study the breakdown behavior of the air-SF 6 mixture under direct, alternating and impulse applied voltages [12].…”

Section: Introductionmentioning

confidence: 99%

Propagation of high-power microwave pulses in air-SF_6 mixtures at high pressure

Zhao

Liao

Lin

2013

International Journal of Applied Electromagnetics and Mechanics

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Simulations of the interaction of high-power microwave (HPM) pulses with air-SF6 mixtures at high pressure in the fluid model are presented, where various reaction sets of air and SF6 are taken into account. Introducing a small amount of SF6 in air can drastically increase the breakdown threshold. At a higher pressure or for a larger pulse width, the breakdown threshold increases more significantly as the percentage of SF6 in the mixture increases. The amplitude of the transmitted pulse in the air breakdown decreases with time and its width is shortened. Due to the higher attachment frequencies in the air-SF6 mixture and SF6, the amplitude of the transmitted pulse keeps almost unchanged after it experiences a short-time attenuation, and the pulse width is not strongly influenced. Most of the energy loss of the transmitted pulse in the gas breakdown propagates in the opposite direction, and the rest of energy loss is due to electron heating. The accuracy of the fluid model is verified by experimental results.

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Numerical Studies of the Propagation of High-Power Damped Sine Microwave Pulse in the Atmosphere

Cited by 10 publications

References 22 publications

Validity of the two-term Boltzmann approximation employed in the fluid model for high-power microwave breakdown in gas

Validity of the two-term Boltzmann approximation employed in the fluid model for high-power microwave breakdown in gas

Short-pulse high-power microwave breakdown at high pressures

Propagation of high-power microwave pulses in air-SF_6 mixtures at high pressure

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