Strong corona pre-ionization device

Abstract

The invention discloses a strong corona pre-ionization device, which is characterized in that a cathode electrode and an anode electrode are strip-shaped; the pre-ionization assembly comprises a long-strip-shaped pre-ionization electrode and an aluminum oxide ceramic tube arranged on the outer side of the pre-ionization electrode in a sleeving mode. The two side faces, in the long side direction,of the cathode electrode are each provided with a pre-ionization assembly. Corner parts are arranged on the two sides of the cathode electrode in the long side direction of the cathode electrode and located at the positions where the pre-ionization assemblies are placed respectively. A plurality of annular grooves are formed in the outer side face of the pre-ionization electrode in the direction of the central axis at equal intervals. And a sharp end formed among the plurality of annular grooves and sharp ends of the cathode electrode at the corners where the pre-ionization assemblies are placed form a strong electric field along the two sides of the long side direction of the cathode electrode, so that working gas around the bulges on the cathode electrode body is ionized to generate initial electrons. The preionization intensity can be increased via the device. Corona strength is better.

Description

technical field [0001] The invention relates to the technical field of high voltage electricity, in particular to a strong corona pre-ionization device. Background technique [0002] The laser pulse output energy of the gas laser depends on the degree of pre-ionization of the gas medium, that is, on the size and distribution of the electron concentration at the initial stage of the discharge. At present, the two most commonly used preionization schemes are corona preionization and free spark preionization. Among them, the initial electron concentration generated by corona preionization is low, which is suitable for small area, high repetition rate and uniform glow discharge. [0003] Commonly used corona preionization such as figure 1 As shown, the pre-ionization electrode and alumina ceramic tube are placed on the edge of the cathode electrode without special structure and close to the cathode electrode. After improving the commonly used corona pre-ionization structure as...

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Problems solved by technology

[0004] In addition, because the length of the metal rod of the prior art pre-ionization electrode is too long, it is easy to deform during processing, and because the metal rod is sleeved in the ceramic tube, the concentricity of the two in the length direction cannot be guaranteed to be 0, so it is necessary to The gap between the outer diameter of the pre-ionization electrode and the inner diameter of the ceramic tube is set to be large, so that the metal rod of the pre-ionization electrode can be installed in the ceramic tube, but the gap between the metal rod of the pre-ionization electrode and the ceramic tube is too large to reduce the pre-ionization. strength

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