Nonlinear effects in the positive column of a strongly modulated mercury-rare gas discharge

Polman, J.; Werf, J. E. van der; Drop, P C

doi:10.1088/0022-3727/5/2/308

Cited by 64 publications

(9 citation statements)

References 20 publications

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“…The operating frequency is -150 kHz, which results in a positive column discharge that is similar to discharges at 60 Hz (i.e., the same electron temperature, electron density, and Hg(3P1) density). 6 The samples were exposed to a power density of 0.03 W/cm 2, which is comparable to that of a 40 W, 120 cm lamp.…”

Section: Shielded Plaquesmentioning

confidence: 99%

Mercury‐Glass Interactions in Fluorescent Lamps

Doughty

Wilson

Thaler

1995

J. Electrochem. Soc.

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During the operation of a fluorescent lamp mercury chemically combines with various components inside the lamp. For some types of lamps most of the bound mercury is observed to reside in the glass, despite the intervening phosphor layer. This consumption of mercury by the glass only occurs when a mercury/rare-gas plasma is present. Experiments were performed to isolate the various factors arising from the operation of the plasma in order to determine which ones are important in driving mercury consumption in the glass. These experiments include shielding samples from the plasma, measuring the line-of-sight transmission of the phosphor, and applying small radial de electrical biases to the lamp. In addition, various analytical techniques, including x-ray photoelectron spectroscopy, Rutherford baekscattering, scanning electron microscopy, and thermally stimulated evolution where used to study the glass surface after exposure to a mercury/ rare-gas plasma. From these studies it is postulated that electrochemical effects play a major role in binding mercury to the glass.

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Section: Shielded Plaquesmentioning

confidence: 99%

Mercury‐Glass Interactions in Fluorescent Lamps

Doughty

Wilson

Thaler

1995

J. Electrochem. Soc.

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“…The plasma is disturbed by the pulse and takes several microseconds to return to equilibrium, but the pulse duration (20 ns) is short comparted to the fastest plasma collisional times (14). Thus at a repetition rate of 15 Hz, the laser pulse is always interrogating the steady-state density of atoms as established by the discharge (and not disturbed by the previous laser pulse).…”

Section: Experimental Techniquementioning

confidence: 99%

Laser Diagnostic Density Measurements of Hg ( 63 P 0 , 1 , 2 ) in a Low Pressure Hg‐Ar Discharge

Bigio¹

1989

J. Electrochem. Soc.

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Two laser techniques are used to derive absolute densities and radial density distributions for the three 63Pj excited states of mercury in the positive column of a low pressure Hg-Ar dc discharge. Radial density distributions are obtained using a saturated laser absorption technique, while absolute densities are measured using the hook method (an interferometric technique). Results are shown and discussed for a variety of discharge currents and pressures.

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“…Polman et al [7] investigated the properties of low-pressure Ne-Hg discharge plasma (P Ne = 10 Torr, P Hg ≈ 6 × 10 −3 Torr, I 0 = 0.4 A), and they showed that modulation of the current in the positive column (I = I 0 (1 + β sin ωt)) gives rise to nonlinear effects on plasma density if the modulation depth was not small compared with unity.…”

Section: Introductionmentioning

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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Nonlinear effects in the positive column of a strongly modulated mercury-rare gas discharge

Cited by 64 publications

References 20 publications

Mercury‐Glass Interactions in Fluorescent Lamps

Mercury‐Glass Interactions in Fluorescent Lamps

Laser Diagnostic Density Measurements of Hg ( 63 P 0 , 1 , 2 ) in a Low Pressure Hg‐Ar Discharge

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

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