Effect of a pulsed power supply on the ultraviolet radiation and electrical characteristics of a low-pressure mercury discharge

Mrabet, Brahim; Elloumi, Hatem; Chammam, Abdeljelil; Stambouli, Moncef; Zissis, Georges

doi:10.1080/10519990600912211

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…This, in turn, leads to less electron generation in the afterglow region. Hg(6 3 P 2 ) and the electron mean temperature T e play the main role in this trend [7,27]. By a further decrease in the off-time of the rectangular waveform beyond the second critical time, the subsequent penning and associative ionizations would generate more electrons together with the electron-impact ionization.…”

Section: Rectangular Pulse Period Effectmentioning

confidence: 99%

The influence of electrical waveform on the electron density and collision frequency of low-pressure gas discharge plasma

Ebrahimi

Sohbatzadeh

Zakeri-Khatir

2019

J. Phys. D: Appl. Phys.

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In this experimental research, the effect of electrical waveforms including direct current (DC), sinusoidal, sawtooth, triangular, modified sinusoidal and square wave on the plasma electron density and collision frequency of the positive column of low-pressure gas discharge (PAr = 10 Torr, PHg = 6 × 10−3 Torr, R = 18 mm, Irms = 400 mA) was examined. Time-resolved plasma electron density and collision frequency were measured by fast time-resolved microwave interferometry with simultaneous current and voltage measurements. In the case of direct current excitation, the striation with 800 Hz fluctuation was observed. In a sine wave, the striation was observed at 50 Hz while it was disappeared at 5 kHz. In the square waveform, the collision frequency that keeps the plasma density constant could be controlled by tuning the excitation frequency. It was also found that a rapid change in the electrical current signal, like the sawtooth waveform, causes a total reduction in the electron density and collision frequency. Studying the rectangular pulse periods, showed that the maximum density and collision frequency, as well as their evolutions, could be controlled. Regarding the obtained results, it was concluded that one could effectively control (increase or reduce) the electron density and collision frequency with respect to the critical time intervals for practical applications such as plasma antennas and plasma RCS reduction.

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Section: Rectangular Pulse Period Effectmentioning

confidence: 99%

The influence of electrical waveform on the electron density and collision frequency of low-pressure gas discharge plasma

Ebrahimi

Sohbatzadeh

Zakeri-Khatir

2019

J. Phys. D: Appl. Phys.

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“…Pulse [19,20], in solid-state and chemical lasers [21][22][23], in state-of-the-art electrophysical units, for distance measurement, in alarm, in high-speed photography, for welding and cutting, in medicine, cosmetology, light engineering, photochemistry, spectrophotometry, water, air decontamination technologies, medications, solutions, instruments, food products, packing materials [24][25][26][27][28][29][30][31][32][33][34]. A wide spectrum of fields of application of impulse lamps predetermines the need for variation of their radiation parameters.…”

Section: Introductionmentioning

confidence: 99%

Power Model of Impulse Arc Discharge Generation in Active Media Optical Pumping Xenon Lamps of Solid-State Lasers

Mandryko

Chirtsov

Mikushev

2019

ETR

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The semi-empirical model of arc impulse discharge development in impulse xenon lamps for optical pumping of solid-state lasers' active media was considered. Equations of the power balance of supplied electrical power and processes of ionization, plasma heating, heat dissipation and optical radiation generation laid the model's basis. The analytical description of the processes being considered results in an ordinary differential equation which allows a non-resource-intensive numerical solution. The built model enables to evaluate basic electrical and optical parameters of non-local arc discharge plasma at its development stage. Comparison with the results of measurements of electrical and optical plasma parameters which are the most convenient for experimental diagnostics in the modelled non-stationary mode testifies to adequacy of the developed model. Relative simplicity and convenience of the model predetermines its possible usage when solving applied engineering tasks of optimization of operating parameters of impulse pumping lamps and for obtaining initial (zero) approximations for comprehensive modelling of a non-local non-stationary gas discharge plasma in science-intensive calculations taking into account a great combination of elementary collision and radiation processes in a non-equilibrium system.

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“…However, by using short pulses of current one can hope to obtain such a result and to modify of this fact the distribution of the atomic excitation and the spectral distribution of the radiation (mainly visible and ultraviolet). Former works showed that the form of the current wave imposed on the lamp could be selected so as to improve the production of the radiation (Chalek, 1981;Brates, 1987;Chammam et al, 2005;Mrabet et al, 2006;Bouslimi et al, 2009aBouslimi et al, , 2009c. It remains, for these sources, to optimize the parameters of excitation (form, amplitude, frequency, duration of pulses) according to those of the discharge (natural of the mixture gas, energy spectral distribution).…”

Section: Introductionmentioning

confidence: 99%

Molecular Photochemistry

2014

Semiconductor Photocatalysis

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He was the recipient of JSPS post doctoral fellowship for the foreign researcher for two years. At present he is a permanent faculty member in department of Chemistry, Banaras Hindu University (central university), Varanasi, India. His present research interests are: synthesis, structure (solid and liquid phase) and interactions in ionic liquids, high energy density materials, and photophysical studies (steady state and time resolved) of fluorescent molecules in condensed phases.

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Effect of a pulsed power supply on the ultraviolet radiation and electrical characteristics of a low-pressure mercury discharge

Cited by 3 publications

References 8 publications

The influence of electrical waveform on the electron density and collision frequency of low-pressure gas discharge plasma

The influence of electrical waveform on the electron density and collision frequency of low-pressure gas discharge plasma

Power Model of Impulse Arc Discharge Generation in Active Media Optical Pumping Xenon Lamps of Solid-State Lasers

Molecular Photochemistry

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