Comparison of the AC barrier corona with DC positive and negative coronas and barrier discharge

Ballato

Plasma Processes & Polymers

2012

Intense and energetic atmospheric plasma emissions were achieved by direct jet‐to‐jet coupling using honeycomb‐structured quartz tube arrays. Two plasma modes were found to exist in the same plasma array structure under a change of gas flow conditions: an intense plasma mode and the well‐collimated plasma mode. In order to describe the direct jet‐to‐jet coupling by electrical coupling of charged particles in the plasma, the optical emission of the plasma array was compared with that of a single tube plasma jet. Under identical electrical driving and gas conditions, the optical intensity from the intense plasma jet was approximately four times larger in the coupled array than in the single plasma jet structure. Additionally, the electron energy in the intense plasma was larger than that of the well‐collimated plasma jets in the same device. This intense and energetic plasma jet, arising through direct jet‐to‐jet coupling, may provide novel applications requiring strong discharge processes using simplified structures and accompanying instrumentation when compared with the present vacuum plasma systems.

Section: Resultsmentioning

confidence: 99%

Intense and Energetic Atmospheric Pressure Plasma Jet Arrays

Ballato

Plasma Processes & Polymers

2012

“…16 For the external excitation source, no obvious luminescence is present between the two pins as shown in Fig. 2.…”

Section: Resultsmentioning

confidence: 94%

Measurement of ion density in an atmospheric pressure argon with pin-to-plate dielectric barrier discharge by resonance of plasma radiation

Pan

Zhou

et al. 2014

Physics of Plasmas

The measurements of the ion densities in the atmospheric AC barrier corona argon discharge are carried out by receiving and analyzing the frequencies of the electromagnetic radiation emitted from the plasma. An auxiliary excitation source composed of a pin-to-pin discharge system is introduced to excite the oscillations of the main discharge. To analyze the resonance mechanism, a complemented model based on a one-dimensional description of forced vibrations is given. Calculations indicate that Ar þ 2 is the dominant ion ($89% in number density). By analyzing resonance frequencies, the ion densities of Ar þ 2 are in the order of 10 19 $ 10 20 m À3 and increase slowly as the applied voltage increases. V C 2014 AIP Publishing LLC.

“…8 It is shown in Ref. 9 that, when xenon, krypton, argon, and neon are excited with a modulated rf discharge near an electrode made in the shape of a point, a diffuse corona discharge is formed at a pressure of 1-2 atm.…”

Section: Introductionmentioning

confidence: 99%

Vacuum-ultraviolet excilamps with excitation by a barrier corona discharge

et al. 2012

This paper presents the results of studies of excilamps with excitation by a barrier corona discharge, which is characterized by inhomogeneous broadening of the electric field between the electrodes, one of which is covered by a dielectric. It is established that the radiation efficiency from inert-gas dimers under these excitation conditions reaches 45% at 172 nm and 25% at 146 nm. These studies were used as a basis for creating a radiator complex consisting of sealed xenon-dimer excilamps with a radiation power of up to 120 W, and a wide-aperture compact excilamp with argon pumped through the discharge volume. The radiation power density of the compact excilamp reached 10 mW/cm 2 in the windowless regime.