Ac breakdown in near-atmospheric pressure noble gases: I. Experiment

Sobota, Ana; Kanters, Jhm Joris; Manders, F Freddy; Gendre, MF; Hendriks, J Jimi; Veldhuizen, van Em Eddie; Haverlag, M Marco

doi:10.1088/0022-3727/44/22/224002

Cited by 9 publications

(55 citation statements)

References 18 publications

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“…Essentially, the collision frequency between electrons and the most abundant heavy particle species determines the locality of electron avalanches, and thus the discharge may look like a streamer (for example, in xenon at 700 mbar) or not (for example, argon at 300 mbar). 12 In the experiments described in this paper, the frequency is kept constant at 100 kHz, but the conditions change due to the gas temperature variation and consequently the variation in the gas mixture and particle pressure. It is reasonable to assume that at this frequency, these variations might cause a transition between the two breakdown regimes.…”

Section: Discussionmentioning

confidence: 99%

“…ða ef f dÞ critical was calculated in steps of 50 K, with c 0 set to 5% and the work function of tungsten to 4.5 eV. 12 At this stage one needs to relate values of ða ef f dÞ critical to the theoretical reduced electric field at breakdown. Let us first examine the a ef f .…”

Section: B Comparison Between Experiments and Theory-the Methodsmentioning

confidence: 99%

“…The other estimate shows the electric field with ten times the radius of curvature; this estimate corresponds to a breakdown event of a diffuse character, which was previously observed at this frequency in argon. 12 There are two important features to notice in Figure 5: • The breakdown conditions at 1400 K and 10 bar of Hg seem to require lower reduced field than 150 mbar of Ar at room temperature.…”

Section: Breakdown Conditions As a Function Of Timementioning

confidence: 99%

“…The temperature, gas mixture, and the driving frequency are factors that influence the behaviour of plasma-driven lamps, 10 they affect their ignition voltage, 11 and they are important in understanding the breakdown process. 12,13 This study examines the electrical breakdown of a gaseous mixture at elevated pressures and temperatures and the associated transitions between breakdown regimes. The analysis in the study can also be used in other gas mixtures than the one tested for the purposes of this paper.…”

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confidence: 99%

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Transition between breakdown regimes in a temperature-dependent mixture of argon and mercury using 100 kHz excitation

Sobota

Bos

Kroesen

et al. 2013

Journal of Applied Physics

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The paper examines the breakdown process at 100 kHz in a changing temperature-dependent mixture of Ar and Hg and the associated transitions between breakdown regimes. Each measurement series started at 1400 K, 10 bar of Hg, and 0.05% admixture of Ar and finished by natural cooling at room temperature, 150 mbar of Ar, and 0.01% admixture of Hg. The E/N at breakdown as a function of temperature and gas composition was found to have a particular shape with a peak at 600 K, when Hg makes up for 66% of the gaseous mixture and Ar 34%. This peak was found to be an effect of the mixture itself, not the temperature effects or the possible presence of electronegative species. The analysis has shown that at this frequency both streamer and diffuse breakdown can take place, depending on the temperature and gas composition. Streamer discharges during breakdown are present at high temperatures and high Hg pressure, while at room temperature in 150 mbar of Ar the breakdown has a diffuse nature. In between those two cases, the radius of the discharges during breakdown was found to change in a monotonic manner, covering one order of magnitude from the size typical for streamer discharges to a diffuse discharge comparable to the size of the reactor.

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Section: Discussionmentioning

confidence: 99%

Section: B Comparison Between Experiments and Theory-the Methodsmentioning

confidence: 99%

Section: Breakdown Conditions As a Function Of Timementioning

confidence: 99%

mentioning

confidence: 99%

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Transition between breakdown regimes in a temperature-dependent mixture of argon and mercury using 100 kHz excitation

Sobota

Bos

Kroesen

et al. 2013

Journal of Applied Physics

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“…3,7 To be able to investigate the hot re-ignition properties of HID lamps under different circumstances a new experimental setup has been designed. The new setup is designed in such way that the breakdown voltage of cold HID lamps and hot HID lamps during cool down can be monitored.…”

mentioning

confidence: 99%

Note: Measuring breakdown characteristics during the hot re-ignition of high intensity discharge lamps using high frequency alternating current voltage

Bos

Sobota

Manders

et al. 2013

Review of Scientific Instruments

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Numerical investigation of the directional control of electron density and gas temperature in atmospheric pressure dielectric barrier discharge by using low- and high-frequency coupling modulation

et al. 2021

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Dielectric barrier discharges (DBDs) are commonly used as efficient sources of large volume diffuse plasmas with moderate temperature and plenty of reactive particles, but the synergistic linkage of some key plasma parameters in single frequency driven systems sometimes limits their application fields and accessible operating ranges. The discrete control of certain key plasma parameters by multi-frequency, i.e., dual frequency (DF), voltage waveform excitations is of increasing requirement and importance for both application-focused and fundamental studies on DBD plasma. In this paper, a significant nonlinear coupling modulation of the discharge evolution process and characteristics caused by the HF oscillation of the high-frequency component in the DF DBD system is observed and investigated, which provides a simple and efficient approach to realize the independent control of the target key plasma parameters such as gas temperature and electron density. Based on a one-dimensional fluid model with semi-kinetics treatment, numerical studies of the tiny high frequency component on the properties modulation of atmospheric DF DBD are reported. The driving voltage waveform is characterized by a 50 kHz fundamental sinusoidal low-frequency signal superimposing a small amount of 2 MHz high-frequency signal [HF component changing from 0 to 100 V with a low-frequency (LF) component fixed at 1 kV as a constant], and the effects of the high-frequency voltage amplitude and phase shift on the discharge characteristics, sheath dynamics, impact ionization of electrons, and key plasma parameters are investigated. Particularly, the effects of phase modulation on the discharge evolution and characteristics for DF DBDs are discussed and revealed. The results have demonstrated that a slight and proper parameter variation of the high-frequency oscillation can provide a high electron seed density, and trap electrons within the sheath, thus achieving required plasma parameters. The sheath dynamics can be effectively modulated by tuning the phase shift, which enables a possible alternative approach to optimize the independent control of the key plasma parameters under atmospheric pressure.

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Ac breakdown in near-atmospheric pressure noble gases: I. Experiment

Cited by 9 publications

References 18 publications

Transition between breakdown regimes in a temperature-dependent mixture of argon and mercury using 100 kHz excitation

Transition between breakdown regimes in a temperature-dependent mixture of argon and mercury using 100 kHz excitation

Note: Measuring breakdown characteristics during the hot re-ignition of high intensity discharge lamps using high frequency alternating current voltage

Numerical investigation of the directional control of electron density and gas temperature in atmospheric pressure dielectric barrier discharge by using low- and high-frequency coupling modulation

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