Backcoupling of acoustic streaming on the temperature field inside high-intensity discharge lamps

Schwieger, J.; Baumann, Bernd; Wolff, Marcus; Manders, F Freddy; Suijker, Jos

doi:10.1088/1742-6596/655/1/012045

Cited by 6 publications

(5 citation statements)

References 13 publications

(23 reference statements)

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“…In order to limit memory capacity and computing time, he developed a two dimensional model corresponding to a lamp of infinite length. The results described in the article at hand base on a three dimensional stationary model [11,12]. The idea is to identify the onset of light flicker by the occurrence of instabilities of the stationary solution.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear behavior in high-intensity discharge lamps

Baumann

Schwieger

Wolff

et al. 2016

J. Phys. D: Appl. Phys.

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Section: Introductionmentioning

confidence: 99%

Nonlinear behavior in high-intensity discharge lamps

Baumann

Schwieger

Wolff

et al. 2016

J. Phys. D: Appl. Phys.

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“…It is seen also in Figure 2 that under the charge exchange and elastic scattering a large number of fast argon atoms are generated, and mercury ions make a main contribution to this process as their substantial fraction has energies exceeding that of argon ions. In Figure 3, the temperature variation of the flow densities of atoms, sputtered from the tungsten cathode surface by different types of particles, obtained with using of expressions (1), (2) and the experimental dependencies Y Ar + (ε) and Y Hg + (ε) [20], are shown. It can be seen that at low temperatures near -30 °C the main contribution to the cathode sputtering make fast argon atoms generated by argon ions.…”

Section: Resultsmentioning

confidence: 99%

“…In different types of gas discharge illuminating lamps, the mixture of argon and mercury vapor is used as the background gas [1,2]. The argon atom number density in it does not depend on the temperature, whereas the mercury atom number density is decreased under its reduction.…”

Section: Introductionmentioning

confidence: 99%

Simulation of cathode surface sputtering by ions and fast atoms in Townsend discharge in argon-mercury mixture with temperature-dependent composition

Бондаренко

Kristya

Savichkin

2018

Prib. metody izmer.

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Для цитирования:Bondarenko G.G., Kristya V.I., Savichkin D.O., Żukovski P. Simulation of cathode surface sputtering by ions and fast atoms in Townsend discharge in argon-mercury mixture with temperaturedependent composition. Simulation of cathode surface sputtering by ions and fast atoms in Townsend discharge in argon-mercury mixture with temperaturedependent composition. AbstractThe mixture of argon and mercury vapor is used as the background gas in different types of gas discharge illuminating lamps. The aim of this work was development of a model, describing transport of electrons, ions and fast atoms in the one-dimensional low-current gas discharge in argon-mercury mixture, and determination of the dependence of their contributions to the cathode sputtering, limiting the device service time, on the temperature.For simulation of motion of electrons we used the Monte Carlo method of statistical modeling, whereas the ion and metastable excited atom motion, in order to reduce the calculation time, we described on the basis of their macroscopic transport equations, which allowed to obtain their flow densities at the cathode surface. Then, using the Monte Carlo method, we found the energy spectra of ions and fast atoms, generated in collisions of ions with mixture atoms, at the cathode surface and also the effective coefficients of the cathode sputtering by each type of particles.Calculations showed that the flow densities of argon ions and fast argon atoms, produced in collisions of argon ions with slow argon atoms, do not depend on the temperature, while the flow densities of mercury ions and fast argon atoms generated by them grow rapidly with the temperature due to an increase of mercury content in the mixture.There are represented results of modeling of the energy spectra of ions and fast atoms at the cathode surface. They demonstrate that at low mercury content in the mixture of the order of 10 -3 the energies of mercury ions exceed that of the other types of particles, so that the cathode is sputtered mainly by mercury ions, and their contribution to sputtering is reduced at a mixture temperature decrease. Для цитирования:Bondarenko G.G., Kristya V.I., Savichkin D.O., Żukovski P. Simulation of cathode surface sputtering by ions and fast atoms in Townsend discharge in argon-mercury mixture with temperaturedependent composition. Simulation of cathode surface sputtering by ions and fast atoms in Townsend discharge in argon-mercury mixture with temperaturedependent composition.

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“…Arc illuminating lamps are nowadays a widespread type of gas discharge devices in which a mixture of argon with fixed density and mercury vapor with the density depending on temperature is often used as the background gas [1][2][3][4][5]. After the lamp turning on the low-current discharge is initiated in it which then transits into the glow and arc modes [6].…”

Section: Introductionmentioning

confidence: 99%

Modeling of an Impact of Thin Insulating Film on the Electrode Surface on Discharge Ignition in Mercury Illuminating Lamps at Low Ambient Temperatures

Бондаренко

Fisher

Kristya

2019

Prib. metody izmer.

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The mixture of argon and mercury vapor with temperature-dependent composition is used as the background gas in different types of gas discharge illuminating lamps. The aim of this work was to develop a model of the low-current discharge in an argon-mercury mixture at presence of a thin insulating film on the cathode and to investigate the influence of film on the discharge ignition voltage at low ambient temperatures. When discharge modeling, we used the obtained earlier expression which describes dependence of the mixture ionization coefficient on temperature. When there was a thin insulating film on the cathode the model took into account that positive charges are accumulated on its surface during the discharge. They generate an electric field in the film sufficient for the field emission of electrons from the metal substrate of the electrode into the insulator and some of them can overcome the potential barrier at the film outer boundary and go out in the discharge volume improving emission characteristics of the cathode.Calculations showed that at a temperature decrease the electric field strengthes in the discharge gap and the voltage in it are increased due to reduction of the saturated mercury vapor density in the mixture followed by the decrease of its ionization coefficient. Existence of a thin insulating film on the cathode surface results in an increase of the cathode effective secondary electron emission yield which compensates the reduction of the mixture ionization coefficient value.The results of discharge characteristics modeling demonstrate that in case of the cathode with an insulating film the discharge ignition becomes possible at a lower inter-electrode voltage. This ensures outdoor mercury lamp turning on at a reduced supply voltage and increases its reliability under low ambient temperatures.

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Backcoupling of acoustic streaming on the temperature field inside high-intensity discharge lamps

Cited by 6 publications

References 13 publications

Nonlinear behavior in high-intensity discharge lamps

Nonlinear behavior in high-intensity discharge lamps

Simulation of cathode surface sputtering by ions and fast atoms in Townsend discharge in argon-mercury mixture with temperature-dependent composition

Modeling of an Impact of Thin Insulating Film on the Electrode Surface on Discharge Ignition in Mercury Illuminating Lamps at Low Ambient Temperatures

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