The generator is a powerful high-current pulses

 

(57) Abstract:

The generator is intended for use in the pulse technique and can be used as a module of the integrated system for inertial method of producing controlled thermonuclear fusion. The generator contains a primary capacitive drive and form a line, interconnected via a managed switch, and also agreed to form a line load, the circuit breaker located at the end of the forming line and connected in parallel, equipped with an additional Manager of the starting switch, set at the beginning of the forming lines parallel to the circuit breaker and the load. The invention allows to reduce the front forming pulse and get the ability to accurately control the beginning of its formation. 3 Il.

The invention relates to the field of particle accelerators, and more specifically to generators of powerful high-current pulses, and most can be effectively used to obtain high-current high-voltage pulse voltage and a pulse duration of 100 NS.

Known generator "Hydra" [1], which is designed to generate two electric beams with parameters: U = 1 MB,Aragats to U3= 3 MB duringC= 0,9 ISS from General primary drive - Marx generator. Using a gas-insulated switch-charged lines are interconnected through obotrites on a low-impedance load - vacuum diodes, which are connected with obotrites through transformers, allowing you to adjust the parameters of the pulse. You know a whole family of such generators powerful high-current pulses, in which the forming of the site are single forming lines.

The disadvantage of such constructions are relatively large dimensions of the primary drives and forming lines necessary to ensure electric insulation at high voltages (U 1 - 5 MB) and relatively large ( ~ 0.5 to 1.5 μs).

The closest in its performance for the proposed solution accelerator is Gamma with parameters: U = 2,0 MB, I = 135 CA = 35 NS [2]. It is a system with inductive energy storage, made in the form of vacuum forming coaxial line with a plasma current interrupter. The primary energy storage device with an output voltage of U = 700 kV switched on shorted plasma vacuum coaxial line and develops in her current time is programmed work impulse.

The disadvantage of this technical solution is a relatively large length of the front formative impulse, as the fronts of the switches (tF. to.10 NS) and breakers (tF. CR100 NS) differ by about an order. When short pulses ( 100 NS) this leads to a significant deformation of the pulse shape from rectangular expected to bell and limits the minimum possible value of the pulse duration. Furthermore, the lack of sufficient accurate torque control tripping of the circuit breaker, usually working in independent mode, trip limits the use of these generators for joint synchronous operation for the total load.

The proposed design reduces the front forming pulse and get the ability to accurately control the beginning of its formation.

This technical effect is achieved due to the fact that the generator of high-current pulses containing a primary capacitive drive and form a line, interconnected via a managed switch, and the matched load and the circuit breaker located at the end of the forming line and enabled parallel is parallel to the circuit breaker and the load.

To illustrate the invention the following are materials in which Fig. 1A presents a schematic diagram of the proposed generator, in Fig. 1B - given the timing diagram of voltage and current in the forming line. In Fig. 2A shows the dependence of the voltage and current at the beginning of the line in the absence of switching additional controlled starter switch and the tripping of the circuit breaker. In Fig. 2B simplistically depicts the power pulses of the prototype and the proposed generator (shaded area). The design of the generator is shown in Fig. 3.

Schematic diagram of the proposed generator shown in Fig. 1A. Here L and C are inductance and capacitance of the primary capacitive drive 1; P is a managed switch 2 through which a primary capacitive drive connected to form line 3; Ppplasma current interrupter 4, the opening of which forming line is connected to the load 5. Thus Rnthe load impedance, and Z is the wave impedance forming lines agreed with each other (Rn= Z); Pwith- new in relation to the prototype element - controlled starter switch 6. The duration of the generated pulse is expressed by the formula:

< / BR>
where l is the length.

In Fig. 1B shows the timing diagram of voltage and current in the forming line. Values U, Iand U, Irespectively the incident and reflected waves of voltage and current in the forming line. Value and is re-reflected waves of voltage and current after triggering additional controlled starter switch at time tto. The value of tp- time tripping of the circuit breaker. The pulse duration is determined by the double length of the forming line, namely the Parameters characterizing the electrical process in the beginning of the forming line before time ttoare determined by the following system of equations:

< / BR>
where U0and maximum values of voltage and current and the characteristic impedance and the frequency of the circuit to the time tto. Given that and also a marking system (1) can be reduced to the following:

< / BR>
Solving (2) with respect to Uand Uget:

< / BR>
where = arctgA.

The difference of the capacities of the incident and reflected waves at the beginning of the forming line before time ttowill be determined by the following dependency:

< / BR>
Substituting (3) into (4) and performing simple trigonometricas the BR> The minus sign means that at this point in time, the energy stored in forming lines, decreases. In Fig. 2A shows the dependence of the voltage and current at the beginning of the line in the absence of switching additional controlled starter switch and the tripping of the circuit breaker. Dashed lines represented the time interval , where the expected pulse shaping. In Fig. 2B simplistically depicts the power pulses of the prototype and the proposed generator (shaded area). The dashed line shows the ideal rectangular pulse. It is seen that the energy-momentum of the proposed generator with precision, made in the simplification, equal to the pulse prototype and differs only in form. Here is the corresponding pulse edges of the prototype and the proposed generator.

To improve the accuracy of controlling the start pulse is provided by stimulating the opening of the circuit breaker in the line at time tp"throw" current, which is determined by the expression:

< / BR>
Using the relations (4) we get:

< / BR>
For time tk= 3/4 "throw" current will be:

< / BR>
Small pulse edges and stimulation of the process of breaking Prieur (Fig. 3) consists of a cylindrical metal housing 7, which, on the one hand closed round bottom 8 that hosts the primary drive 1, and, on the other hand, has a tapered shape and ends with a round stub - anode 9. Inside the housing is a cylindrical electrode 10, which in combination with the housing 7 forms a forming line 3. The cylindrical electrode 10, on the one hand, is connected with the primary drive 1 via a managed switch 2, and, on the other hand, ends with a cone, which is attached a cylindrical cathode 11. The cathode 11 and the anode 9 to form the load - vacuum diode 5, the volume of which is enclosed between the cones of the housing 7 and the cylindrical electrode 10 is separated from the environment forming line vacuum support disc insulator 12. Environment the primary storage is separated from the environment forming lines ring design for more controlled starter switch 6. In the conical part of the housing 7 there are several plasma cannons, which form a plasma current interrupter 4. The power source of the plasma guns, plasma current interrupter 4 control switches 2 and 6, and the charging system primary capacitive accumulate alausi switch 2 is discharged to form a line of 3, pre shorted plasma ejected plasma guns plasma current interrupter 4. At time tkswitching additional start switch 6. In forming lines forming a "shot" of current that stimulates the opening of the plasma current interrupter 4. As a result, the load, which is a vacuum diode 5, consisting of a cathode 11 and the anode 9, formed a working pulse, a simplified form of which is shown in Fig. 2B.

The proposed design can be used as a module of the integrated system for inertial method of producing controlled thermonuclear fusion.

Sources of information

1. Thomas N. Martin. The Hydra electron beam generator. IEEE Transactions on Nuclear Science, 1973, NS-20, N 3, p. 289-293.

2. Accelerator Gamma Soan USSR, Preprint N 13, Tomsk, 1985.

The generator is a powerful high-current pulses containing a primary capacitive drive and form a line, interconnected via a managed switch, and consistent with forming the line load and the circuit breaker located at the end of the forming line and connected in parallel, wherein the generator is provided with an additional article Manager

 

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