The transient glow discharge in nitrogen and dry air

Chalmers, I.D.

doi:10.1088/0022-3727/4/8/314

Cited by 34 publications

(18 citation statements)

References 7 publications

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“…In many cases thermal ionization instabilities can explain these contractions [47,48]. However, for thermal instabilities the temperature in the bulk is on the order of thousand kelvin or more.…”

Section: Discussionmentioning

confidence: 99%

Power dissipation, gas temperatures and electron densities of cold atmospheric pressure helium and argon RF plasma jets

Hofmann

Gessel

Verreycken

et al. 2011

Plasma Sources Sci. Technol.

264

229

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A set of diagnostic methods to obtain the plasma parameters including power dissipation, gas temperature and electron density is evaluated for an atmospheric pressure helium or argon radio frequency (RF) plasma needle for biomedical applications operated in open air. The power density of the plasma is more or less constant and equal to 1.3 × 10 9 W m −3 . Different methods are investigated and evaluated to obtain the gas temperature. In this paper the gas temperatures obtained by rotational spectra of OH(A-X) and N + 2 (B-X) are compared with Rayleigh scattering measurements and measurements of the line broadening of hydrogen and helium emission lines. The obtained gas temperature ranges from 300 to 650 K, depending on the gas. The electron densities are estimated from the Stark broadening of the hydrogen α and β lines which yield values between 10 19 and 10 20 m −3 . In the case of helium, this is an overestimate as is shown by a power balance from the measured power density in the plasma jet. The obtained plasma parameters enable us to explain the radial contraction of the argon plasma compared with the more diffuse helium plasma. The accuracy of all considered diagnostics is discussed in detail.

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Section: Discussionmentioning

confidence: 99%

Power dissipation, gas temperatures and electron densities of cold atmospheric pressure helium and argon RF plasma jets

Hofmann

Gessel

Verreycken

et al. 2011

Plasma Sources Sci. Technol.

264

229

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“…Plasma sources that simultaneously possess the major characteristics of thermal and nonthermal plasmas are relatively rare. Examples are the gliding arc discharges, transient glow, [14][15][16] and pulsed arc jets. 17) Plasmas of such types undergo thermal-to-nonthermal transition in space or in time.…”

Section: Introductionmentioning

confidence: 99%

“…18,19) It is widely accepted that such a transition in gliding arc discharges is controlled by the convective flow through diverging electrodes, 19) while the transition in transient glow discharges relies on the energy dissipated into the electrode surface. 16) Despite the large number of reported works regarding plasma involvement in the transition between thermal and nonthermal discharge modes, the study in the AP plasma jet sustained by repetitive pulsed power remains relatively rare. It is not yet identified the discharge mode transition in a plasma jet of such a type.…”

Section: Introductionmentioning

confidence: 99%

Mode Transition of an Atmospheric Pressure Arc Plasma Jet Sustained by Pulsed DC Power

Hsu¹,

Wu²,

Chen

et al. 2009

jjap

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We present a lattice formulation of non-commutative Yang-Mills theory in arbitrary even dimensionality. The UV/IR mixing characteristic of noncommutative field theories is demonstrated at a completely non-perturbative level. We prove a discrete Morita equivalence between ordinary Yang-Mills theory with multi-valued gauge fields and non-commutative Yang-Mills theory with periodic gauge fields. Using this equivalence, we show that generic non-commutative gauge theories in the continuum can be regularized non perturbatively by means of ordinary lattice gauge theory with 't Hooft flux. In the case of irrational non-commutativity parameters, the rank of the gauge group of the commutative lattice theory must be sent to infinity in the continuum limit. As a special case, the construction includes the recent description of non-commutative Yang-Mills theories using twisted large-N reduced models. We study the coupling of non-commutative gauge fields to matter fields in the fundamental representation of the gauge group using the lattice formalism. The large mass expansion is used to describe the physical meaning of Wilson loops in non-commutative gauge theories. We also demonstrate Morita equivalence in the presence of fundamental matter fields and use this property to comment on the calculation of the beta-function in non-commutative quantum electrodynamics.correspondence has been used to suggest that non-commutative geometry provides a natural framework to describe non-perturbative aspects of string theory [2,5]. This belief is further supported by the fact that Matrix Theory [6] and the IIB-matrix model [7], which are conjectured to provide non-perturbative definitions of string theories, give rise to non-commutative Yang-Mills theory on toroidal compactifications [8]. The particular non-commutative toroidal compactification is interpreted as being the result of the presence of a background Neveu-Schwarz two-form field, and it can also be understood in the context of open-string quantization in D-brane backgrounds [9, 10]. Furthermore, in ref. [11] it has been shown that the IIB-matrix model with D-brane backgrounds is described by non-commutative Yang-Mills theory.The early motivation [12] for studying quantum field theory on non-commutative spacetimes was that, because of the spacetime uncertainty relation, the introduction of non commutativity would provide a natural ultraviolet regularization. However, more recent perturbative calculations [13]- [16] have shown that planar noncommutative Feynman diagrams contain exactly the same ultraviolet divergences that their commutative counterparts do, which implies that the non commutativity does not serve as an ultraviolet regulator. One therefore needs to introduce some other form of regularization to study the dynamics of non-commutative field theories. On the other hand, it has been found that the ultraviolet divergences in non-planar Feynman diagrams [16,17] exhibit an intriguing mixing of ultraviolet and infrared scales, which can also be described using string-theoreti...

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“…Chalmers suggested that the criterion for a glow-to-arc transition is that a certain quantity of energy is consumed in the gap during the glow phase. 11) Figure 6 shows the plots of energy consumed in the discharge during the glow phase as a function of charging voltage for three different gap lengths. The energy consumed is calculated by integration of the power over time, which is obtained by multiplying the discharge current by the voltage during the duration of the glow phase.…”

Section: Criterion For the Glow-to-arc Transitionmentioning

confidence: 99%

Production of Pulse Glow Discharge in Atmospheric Pressure Nitrogen Using Needle-Array Electrode

Takaki¹,

Kirihara²,

Noda³

et al. 2006

Jpn. J. Appl. Phys.

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An atmospheric pressure glow discharge was generated using a needle-array electrode in nitrogen. A pulsed high voltage with short rise time under 10 ns was employed to generate streamer discharges simultaneously at all needle tips. The large number of streamer discharges prevented glow-to-arc transition caused by inhomogeneous thermalization. Semiconductor opening switch (SOS) diodes were employed as an opening switch to shorten the rise time. The glow current was drastically decreased by eliminating the SOS diode, in which case the charging voltage was directly applied to the electrode. Spatial- and time-averaged electron densities in a positive column were estimated from calculations based on nitrogen swarm data. The density was estimated to be 1.8×1011 cm-3, which was much larger than 9.7×109 cm-3 in the case without the SOS diode.

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The transient glow discharge in nitrogen and dry air

Cited by 34 publications

References 7 publications

Power dissipation, gas temperatures and electron densities of cold atmospheric pressure helium and argon RF plasma jets

Power dissipation, gas temperatures and electron densities of cold atmospheric pressure helium and argon RF plasma jets

Mode Transition of an Atmospheric Pressure Arc Plasma Jet Sustained by Pulsed DC Power

Production of Pulse Glow Discharge in Atmospheric Pressure Nitrogen Using Needle-Array Electrode

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