The device is pumping close-up of a gas laser or amplifier high pressure

 

Usage: in the gas-discharge lasers Surgutneftegaz pressure x-ray pre-ionization of the active medium. The technical result is an increase in the aperture of the device pumping gas laser or amplifier operating pressure of the active medium and the volume of specific energy input in the discharge of the pump. The inventive device pump close-up of a gas laser or amplifier high-pressure containing installed in the discharge electrodes of the discharge pump - high-voltage cathode and passing x-ray radiation grounded flat anode grid structure, the pulse power system, consisting of high-voltage impulse generator, made by the scheme LC-oscillator, and intermediate capacitive drive, high-voltage plate which is connected to the cathode and the first output voltage impulse generator, and the other plate connected to the anode and a grounded second output voltage impulse generator, and is supplied by a source of x-rays - x-ray pre-ionizer, adjacent to the discharge chamber on the anode side, wherein the intermediate capacitive drive is made in the form of ohbayashi, formed is made of metal body of the discharge chamber and the outer shell, and through the high-voltage input connected to the first output of the voltage impulse generator and a cathode made of solid material with enhanced photoemission properties, and the anode has a rectangular shape and in its Central part is a window in the form of a mesh, transparent to x-ray radiation of the pre-ionizer. 2 C.p. f-crystals, 2 Il.

The invention relates to the field of quantum electronics and can be used in gas discharge lasers or amplifiers Surgutneftegaz pressure x-ray pre-ionization of the active medium. In particular, the invention is intended for use in the composition of the CO2-laser system for generating pulses of picosecond duration and terawatt of power.

All installations of this type are built on the principle of a master oscillator - power amplifier, because the principal features of formation and compression of single picosecond laser pulses at a wavelength of 10 microns limit value of output power of the generator is ~10-5J. This raises the problem of their further strengthening in 1052the overlapping of the individual rotational-vibrational transitions due to their collisional broadening occurs at a pressure of 10 ATM. Band of amplified frequency of the active medium of the amplifier increases to 13 cm-1that gives you the ability to amplify pulses with duration up to 1 PS (C. T. Platonenko, C. D. Trenogin. Coherent amplification of light pulses in media with discrete spectrum. Quantum electronics, volume 10, 11, 1983, S. 2246-2256). In addition, to obtain laser pulses with a power of ~1 TW the pumping system must provide the excitation of the active medium in a volume of ~10 l when the aperture of ~100 cm2.

Creating amplifiers high pressure (ATC) aperture5 cm2represents an independent problem solving tasks as fundamental and technical nature. However, the main difficulty in the creation of such a device is of govcloud not less than 150 j/L. ATM. For the formation of pulse self-sustaining discharge (OCR) high (1 ATM) of pressure you use a pre-ionization of the gas environment by establishing minimum initial electron concentration around the active volume of the bit field and the most rapid rise of the voltage to a value higher than the static breakdown voltage of the gas mixture (E. P. Velikhov, and other Pulse CO2lasers and their application to isotope separation. M., Nauka, 1983).

Known electrical discharge excitation system active medium Surgutneftegaz CO2laser self-discharge and ultraviolet (UV) pre-ionization containing solid electrode is the anode and the cathode, made of steel mesh. As the power system used 5-speed high-voltage impulse generator (GIN), collected under the scheme Marx (M. Blanchard, J. Gulbert et al. Superatmospheric double-discharge CO2-laser. J. of Appl. Phys., v.45, 3, 1974, R. 1311-1314).

The disadvantage of this device pumping the laser medium is the use of the system preionization mode UV radiation, which causes a strong inhomogeneity of the electron density at the depth of the discharge gap. As a result the value of the specific EN ranovitsa less than 50 j/l ATM.

Known pumping system CO2-laser pre-ionization of the active medium soft x-ray radiation, which have significantly higher penetrating power compared to UV-radiation. For the power of the discharge is used 2 or 3-stage GIN, collected under the scheme of Marx. Bit period of the device is formed of a solid shaped electrode (cathode) and flat aluminum electrode (anode), x-ray transparent (Jayaram Krishnaswamy, A. J. Alcock. X-ray preionization of self-sustained, transverse excitation CO2-laser discharges. J. of Appl. Phys., v. 58, 5, 1985, R. 1719-1726).

The disadvantages of the device should be attributed to the small value of the pulse duration of the preionization mode (~ 100 NS), which leads to demand strict timing of the pre-ionizer and discharge pump, and, consequently, unstable operation of the device at high pressures active compounds and to limit the energy input in the discharge (< 150 j/l ATM) when P >3 ATM.

A common disadvantage of the above two systems, the formation of the SRF is a high inductance discharge circuit GIN - load. This limits the time of energy input into the discharge pump and complicates the implementation of the SRF with the increased pressure of the active medium.

A device mi electrodes, forming the bit period. For the preionization mode uses UV radiation. In order to reduce the inductance of the circuit of the pump used in the intermediate capacitive drive (forming a line on the glycerol), located in the immediate vicinity of the discharge chamber. 8 step Winmarks used as a charger intermediate storage (C. Y. Baranov, V. M. Borisov and others About the changing characteristics of the XeF excimer laser with increasing pressure. Quantum electronics, so 5, 10, 1978, S. 2285-2289).

The drawbacks are the use of UV pre-ionization of the active medium and the basic need of the use of complex multi-channel gas diverter for switching the intermediate storage to the load. These facts are the reason for the sharp decrease in the efficiency of energy transfer in the discharge of the pump when R >4 ATM.

A device pumping close CO2amplifier high-pressure containing installed in the dielectric discharge chamber electrodes of the discharge pump - high-voltage profiled cathode and a grounded flat mesh anode permeable to x-rays. Pulsed power system device is nesiruosia inductance discharge circuit pump and constituting a battery in a low-inductance capacitors, located in the immediate vicinity of the discharge chamber. The high-voltage plate intermediate the drive is connected to the cathode and the first output Gina and the other plate connected to the anode and a grounded second output Gina. The device is provided with a source of soft x-ray radiation, adjacent to a discharge chamber on the anode side and is made on the basis of explosive-emission diode with brake "through" anode (G. A. Baranov, A. A. Kuchinsky et al. Development of excitation system for a large-area high-pressure CO2-amplifier. Plasma Devices and Operation, v.5, 1997, p.199-209).

The lack of aperture value of this pumping device (25 cm3and these systems does not allow to solve the problem of generation or amplification of pulses terawatt of power.

The invention solves the problem of increasing the aperture of the device pumping gas laser or amplifier, the operating pressure of the active medium and the volume of specific energy input in the discharge of the pump, which is required for the generation or amplification of picosecond pulses terawatt of power.

The invention consists in a device of the pump close-up of a gas laser or amplifier high-pressure containing installed in the discharge to Loki the anode grid structure, pulsed power system, consisting of high-voltage impulse generator, made by the scheme LC-oscillator, and intermediate capacitive drive, high-voltage plate which is connected to the cathode and the first output voltage impulse generator, and the other plate connected to the anode and a grounded second output voltage impulse generator, and is supplied by a source of x-rays - x-ray pre-ionizer adjacent to a discharge chamber on the anode side. Intermediate storage in this device is made in the form of covering the discharge chamber of a water capacitor, high voltage lining which is located in a water cavity formed is made of metal body of the discharge chamber and the outer shell, and through the high-voltage input connected to the first output of the voltage impulse generator and a cathode made of solid material with enhanced photoemission properties, and the anode has a rectangular shape and in its Central part is a window in the form of a mesh, transparent to x-ray radiation of the pre-ionizer.

In the particular case of the performance of the proposed device pumping water cavity intermediate capacitive NAC intermediate capacitive drive can be connected to the high voltage pulsed generator through the inductance, including through non-linear inductance.

The technical result arising from the use of the invention is to increase the aperture of the system pump, the pressure of the active medium and the volume of specific energy input in the discharge, which allows you to generate or amplify the pulses of picosecond duration terawatt power range. The major advantage of the proposed device is that for any size of the discharge chamber inductance discharge circuit including a water condenser and the load will be minimum possible.

The invention is illustrated in the drawing, where Fig.1 shows an example construction of the proposed pumping device, and Fig.2 is an electric diagram of a pulsed power system for the excitation of the discharge pump.

High-voltage cathode 1 (Fig.1) dimensions HH mm, made of brass, has a profiled shape and located above the flat grounded rectangular anode 2 sizes h mm, made of stainless steel, in the Central part of the window 3 in the form of a metal grid, x-ray transparent. Cross-section of the bit region (h mm) is determined by the size of the flat part kata camera 5 and is installed directly under the anode 2. The x-ray source is an explosive-emission diode with brake "through" anode, the geometrical dimensions of which coincide with the dimensions of the cross-section of the bit field. The electrodes of the discharge pump - cathode 1 and the anode 2 are located inside a metal cylindrical discharge chamber 5 filled active gas medium. High-voltage cathode 1 is fixed on the passing of the insulator 6, and the anode 2 on the mounting flange 7. In the immediate vicinity of the discharge chamber 5 is cylindrical high-voltage intermediate plate capacitive drive - to-water condenser 8, fixed to pass the insulator 6. Earth facing the water capacitor formed by the metal surface of the discharge chamber 5 and the outer composite metal shell 9. Formed between the water cavity 10 is filled with distilled deionized water. Voltage to the electrodes of the discharge pump and the water condenser is led through the high-voltage input 11. Water cavity 10 intermediate water capacitive drive is connected with a gas volume discharge chamber 5 through the diaphragm of the pressure compensator 12.

Pulsed power system (Acci between the electrodes 1 and 2). GIN 13 is made for the LC-oscillator, and intermediate capacitive drive 8 is a water condenser (Fig. 1). The cathode 1 of the discharge gap connected to the high voltage plate of the water condenser 8 and a negative output GIN 13, and the anode 2 is connected to the grounded output GIN 13. The pre-ionization of the active medium is x-pre-ionizer with 4 separate power supply unit 14, which represents a high-voltage generator, a switching spark gap. The synchronization of the x-ray of the pre-ionizer 4 and pulsed power systems pumping device by using the synchronization unit 15, which may be made on the basis of sections of cable lines switched hydrogen thyratron. In your device you can connect the intermediate capacitive drive 8 to GIN 13 through the inductor 16.

The pumping device operates as follows.

Between the electrodes 1 and 2 of the discharge chamber 5 (Fig.1) creates a need for CO2laser or amplifier gas mixture at a certain pressure. Due to the presence of the compensator 12 the same pressure is established in the water cavity 10 of a water condenser 8. The pressure compensator 12 FL active medium in the discharge chamber 5 and thereby to increase the dielectric strength of the dielectric fluid. This reduces the mechanical load on the discharge chamber when R>1 ATM and transferred to the outer shell 9. In the initial moment of time storage capacitors GIN 13 and the power source 14 of the pre-ionizer is charged to a voltage U0(Fig.2). After starting x-ray of the pre-ionizer 4 are pre-ionization of the gas mixture between the electrodes 2 and 1. After some time the signal from the synchronization unit 15 is run arresters GIN 13, which provides charging the intermediate capacitive drive - to-water condenser 8 at a speed determined self-inductance of a Hin. While reaching to the bit period of a certain value U1(U1U0n, where n is the number of steps GIN 13) is the water discharge of the capacitor, which could be called "fast" drive through the bit period, while the energy input into the volumetric discharge of the pump is determined by the inductance of the circuit water condenser - load. Connect a water condenser 8 to GIN 13 through the inductance 16 prevents the transfer of energy from a "fast" drive in LC-generator (GIN 13). Thus preferably splendom example (Fig.1, 2) the design of the pumping system for CO2-regenerative amplifier, part of the laser system for the generation and amplification of pulses of picosecond duration and terawatt power (Century A. Astakhov, D. A. Baranov and other Problems create close CO2-amplifiers high pressure. International conference "Physics of lasers. Interaction of laser radiation with matter". A collection of annotations, Sarov, February 2002, S. 22-23). The design characteristics of the amplifier: the Aperture of the bit field, cm2, 10x10.

The length of the bit field, cm, 100.

The composition of the gas mixture CO2N2He.

The pressure of the gas mixture, ATM, 5-10.

The content of molecular gas, %, not less, 15.

The specific energy input, j/1ATM, not less, 150.

The gain signal is weak, cm-1not less than 0,02.

The diameters of the discharge chamber and the outer shell of 800 mm and 1000 mm, respectively, full length design 2000 mm

16 manual LC-generator has the following parameters: Maximum voltage, MB, 1,0.

The maximum stored energy, kJ, 15.

The time of charge of the intermediate storage, ISS, no more 2.

The capacity of the intermediate storage, nF, not m is connected between the "fast" storage and an LC oscillator. On the layout experimentally confirmed the growing dependence of the dielectric strength of water, increasing its pressure.

Claims

1. The device is pumping close-up of a gas laser or amplifier high-pressure containing installed in the discharge electrodes of the discharge pump - high-voltage cathode and passing x-ray radiation grounded flat anode grid structure, the pulse power system, consisting of high-voltage impulse generator, made by the scheme LC-oscillator, and intermediate capacitive drive, high-voltage plate which is connected to the cathode and the first output voltage impulse generator, and the other plate connected to the anode and a grounded second output voltage impulse generator, and is supplied by a source of x-rays - x-ray pre-ionizer adjacent to a discharge chamber on the anode side, characterized in that the intermediate capacitive drive made in the form of covering the discharge chamber of a water capacitor, high voltage lining which is located in a water cavity formed is made of metal casing bit Kama the deposits and the cathode, made of solid material with enhanced photoemission properties, and the anode has a rectangular shape and in its Central part is a window in the form of a mesh, transparent to x-ray radiation of the pre-ionizer.

2. The pumping device under item 1, characterized in that the water cavity intermediate capacitive drive is connected with a gas volume of the discharge chamber through the diaphragm of the pressure compensator.

3. The pumping device under item 1 or 2, characterized in that the intermediate capacitive storage is connected to the high voltage pulsed generator through the inductance.

 

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