SU758312A1 - Pulsed gas-discharge light source - Google Patents

Description

The invention relates to pulsed gas-discharge devices with transverse discharge, used, in particular, in laser technology. ·

Known gas-discharge devices, in which the metal rod electrodes in a dielectric flask are arranged along its entire length.

To increase the uniformity of filling of the discharge gap with plasma | θ, an auxiliary charge discharge is used between additional electrodes located along the main electrodes on the outer sides of rectangular plates ^{3 that} form the discharge volume.

A powerful discharge ionizes only a small part of the gas, which is located in a small volume near the parts of the ignition electrodes 5, which are closer than the others.

The closest to the present invention is a pulsed gas-discharge light source containing a tubular flask filled with working gas or steam from a dielectric material with optically transparent windows on the ends, placed inside the bulb ignition electrodes installed in an electrically insulating sheath along the entire length of the bulb, and two main electrodes connected to the current leads [3}.

This method of ignition of the auxiliary discharge gives good results only when the rectangular shape of the cross section of the discharge volume 20, when the additional electrodes, made in the form of metal strips, are arranged parallel to each other. With a non-rectangular cross section of a discharge volume, for example, a circular volume, the efficiency of an auxiliary discharge ignited with electrodes located outside the discharge volume drops sharply. In these cases, the

The purpose of the invention is to reduce the inductance of the device and increase the uniformity of the distribution of the luminous gas in the discharge volume.

This goal is achieved by the fact that in a pulsed gas-discharge device filled with working gas for steam containing a flask of dielectric material with optically transparent windows at the ends, the discharge ignition electrodes in the electrically insulating shell are placed inside the flask along its entire length

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electrodes connected to the current leads, which are vacuum-welded into the flask; the main electrodes are made of metal coaxially arranged tubes and rods, each of which is connected to the tube at one end, and the other electrodes to the other; electrically insulated shells / ignition electrodes.

FIG. 1 schematically shows a pulsed gas-discharge source ^and

light, transverse section, in FIG. 2, section A-A in FIG. 1, in FIG. 3 section bb in fig. 1, in FIG. 4 - schematic diagram of the connection of the electrodes to the power source. 15

The device consists of a quartz bulb 1 with quartz flat-parallel windows 2 welded to it.

Inside the flask there are main electrodes formed by rods 3 and pipes 20, 4, and auxiliary electrodes 5, which are located in quartz flat tubes 6. Kovarovy core 3 is connected to tungsten current lead 7, copper tube 4, and tungsten holding body 25 of rod 8 by means of brass parts 9. Glass beads 10 are welded on the rods so that the tubes of the main electrodes do not sag and do not touch the rods from the current lead side .. The discharge device is pumped through the nozzles 11 by the working gas.

Gas discharge device operates as follows.

First, a voltage pulse (50-100 kV) with an energy of ~ 10 ' ² J and duration ^ 1 is applied from the pulse generator voltage ^ 5 voltage GIN1 (Fig. 4) to the auxiliary electrodes 5. ms The triggering pulse RIN2 of the main electrodes is supplied with a certain delay (up to 1 μs) with respect to the pulse from GN1. The main discharge with an energy of 1-100 J occurs in a volume bounded by flat

./quartz tubes b and main electrodes. The latter consist of coveted rods 3, each of which is covered by a copper tube 4. The current through them flows from the current leads 7 through the rod 3 in one direction and through the tube 4 - * / in the opposite direction, since the rods' 3 are electrically connected to the tubes. 4 at one end opposite to where the current leads are 7. Reverse, directional currents in the rod and tube 55 reduce the inductance of the electrodes. The electrical connection of each rod 3 and tube 4 at the opposite windows of the device allows you to create a more uniform potential between the electrodes along the entire length of the discharge part. In this case, the discharge occurs between the beginning of one (with a large potential) and the end of the other electrode (with a small potential). The potential difference remains the same along the entire length of the electrodes. Uniform distribution of the discharge current over the cross section of the discharge gap and, therefore, of the luminous gas over the discharge volume is achieved by preliminary ionization of the gas by an auxiliary discharge and by the fact that the current leads are located on opposite ends of the discharge device. The beam cross-section emitted by the instrument has a shape corresponding to the limitation of the discharge volume with flat tubes and main electrodes, although the flask has a circular cross-section.

Claims (1)

Claim A pulsed gas-discharge light source containing a tubular flask of dielectric material filled with working gas or steam and optically transparent. two ends of the ignition electrodes installed inside the electrically insulating sheath along the entire length of the bulb, two main electrodes connected to a vacuum lead-tight current lead in the flask, characterized in that in order to reduce the pulse duration by reducing the inductance of the light source and increase the uniformity of radiation, each main electrode is made of ^- metal coaxially arranged tube and rod connected at one end with the tube, and at the other with current lead m, with the current leads installed at the opposite ends of the bulb, and the main electrodes and the ignition electrodes are installed diametrically opposite in two mutually perpendicular directions. '