A plasma generating apparatus including: a plasma generating unit including a tubular dielectric to which an atmospheric pressure plasma generation gas is introduced, an inner electrode extending in a hollow portion of the tubular dielectric in axial direction of the tubular dielectric and having a coil shape or an irregular surface, and an outer electrode provided on the outside of the tubular dielectric, the inner electrode and the outer electrode being positioned opposite to each other through the tubular dielectric; and a discharge port for discharging an active gas containing active species generated by the atmospheric pressure plasma generated in the plasma generating unit.

A compact cylindrical vacuum chamber made from a dielectric ceramic or glass wrapped with a cylindrical electrode connected to an RF source make a hollow cathode RF plasma source. The dielectric cylinder is used as the vacuum container with the conductive electrode outside the vacuum region to excite plasma inside. A gas is supplied by a gas source at low flow on one end of the cylinder and after being excited exhausts into a connected vacuum chamber carrying excited metastables and radicals. RF power is applied to the electrode to excite the plasma via the hollow cathode effect. This remote RF plasma source can be used to create ions, electrons, excited metastables, and atomic radicals for use downstream depending on choices of gas, pressure, flow rates, RF power and frequency, and extraction electrodes.

An air fed mycoplasma device includes an array of elongate microchannels formed in a plastic or ceramic having tolerance to ozone and other radicals formed when plasma is generated from air in the microchannels. The microchannels include inlets configured to accept an air feed, and outlets configured to direct plasma jets toward a surface (which may be flat or internal to a pipe, for example) or object. An array of electrodes within the plastic/ceramic housing is configured to ignite and maintain plasma in the microchannels and is isolated by the dielectric from the microchannels. A supply intake for is configured to providing a plasma medium into the microchannels.

A dielectric barrier discharge actuator comprising a first electrode disposed adjacent on a surface of a dielectric; a second electrode disposed under the surface and downstream of the first electrode, relative to a flow direction of an ionized layer; an electrical ballast, a third electrode disposed on the surface of the dielectric downstream from the second electrode, connected to the second electrode through the ballast; a series of equal potential strips disposed across the surface of the dielectric and aligned perpendicular to the flow direction of the ionized layer; and a voltage source for applying a voltage across the first and second electrodes, to cause ionization of air between the first electrode and the surface of the dielectric, and to accelerate the ions across the surface of the dielectric; whereby an ionized layer is created when the first electrode is energized by the voltage source.

A dielectric barrier discharge ionization detector (BID) capable of achieving a high level of signal-to-noise ratio in a stable manner is provided. In a BID having a high-voltage electrode, upstream-side ground electrode and downstream-side ground electrode circumferentially formed on the outer circumferential surface of a cylindrical dielectric tube, a heater for heating the cylindrical dielectric tube or tube-line tip member attached to the upper end of the same tube is provided. Increasing the temperature of the cylindrical dielectric tube by this heater improves the stability of the electric discharge, whereby the amount of noise is reduced and a high level of signal-to-noise is achieved.

A dielectric barrier discharge ionization detector capable of achieving a high signal-to-noise ratio is provided. The detector includes: a discharging section for generating plasma from argon-containing gas by electric discharge; and a charge-collecting section for ionizing a component in a sample gas by an effect of the plasma and for detecting ion current formed by the ionized component. The discharging section includes a cylindrical dielectric tube having a high-voltage electrode connected to AC power source as well as upstream-side and downstream-side ground electrodes and formed on its outer circumferential wall. A semiconductor film is formed on the inner circumferential surface of the tube. The upstream-side and downstream-side ground electrodes are respectively made longer than the initiation distances for a creeping discharge between the high-voltage electrode and a tube-line tip member as well as between the high-voltage electrode and the charge-collecting section.

The dielectric barrier discharge ionization detector includes: a dielectric tube through which a plasma generation gas is passed; a high-voltage electrode formed on the outer wall of the dielectric tube; two ground electrodes and formed on the outer wall of the dielectric tube, with the high-voltage electrode in between; a voltage supplier for applying AC voltage between the high-voltage electrode and each ground electrode to generate electric discharge within the dielectric tube and thereby generate plasma from the plasma generation gas; and a charge-collecting section for detecting an ion current formed by ionized sample-component gas produced by the plasma. The distance between one ground electrode and the high-voltage electrode is longer than a discharge initiation distance between these two electrodes, while the distance between the other ground electrode and the high-voltage electrode is shorter than the discharge initiation distance between these two electrodes.

The invention relates to an electrode arrangement (1) for generating a non-thermal plasma, comprising: a layer-shaped first electrode (2) made of an electrically conductive material, a layer-shaped second electrode (4) made of an electrically conductive material, wherein the second electrode (4) is electrically insulated from the first electrode (2), and a dielectric barrier (3) being arranged between the first electrode (2) and the second electrode (4), so that the non-thermal plasma is generated by a dielectric barrier discharge. The inventive electrode arrangement is characterized in that at least one of the first electrode (2) and the second electrode (4) comprises several perforations which are distributed over the electrode.

Water is flowed inside main body section formed from an insulating material such that a specified space remains inside the main body section. Electrodes and are arranged along the outer walls of the main body section and voltage is applied to the electrodes. Processing gas present inside the main body section is plasmarized and plasma is emitted to the water flowing inside the main body section.

A method for preparing cold atmospheric plasma stimulated cell culture media with a cold atmospheric plasma system having a delivery port out of which an inert gas flows. The inert gas may be helium. The method comprises the steps of placing a cell culture media in a first well, the first well having a bottom and having a diameter greater than 20 mm; wherein the cell culture media placed in the first well has a volume of 4 ml or less, treating the cell culture media in the first well with cold atmospheric plasma, wherein the treating is performed with a gap between the delivery port and the bottom of the first well is between 2.5 cm and 3.5 cm, and transferring a portion of the treated media to cultured cancer cells in a second well. The cold atmospheric plasma may be applied for 0.5 minutes to 2 minutes.