RU72555U1 - DIAGRAM OF A PULSED NEUTRON GENERATOR - Google Patents

Abstract

The utility model relates to the exploration and detection of hidden masses or objects using radioactivity, specifically to the development of power schemes for pulsed neutron generators. The technical result of the utility model is to increase reliability, increase stability, compactness. The technical result is achieved in that the pulsed neutron generator circuit is made in the form of a module from series-connected electronics, switching units and a neutron tube unit, the electronics unit containing a power filter, a power on / off circuit, a control pulse generation circuit, and a switching unit containing a step-up transformer with rectifiers of the power supply for switching units and a neutron tube, switch ignition pulse generation circuit, charging voltage divider in the circuit tnoj connection and the switch unit comprises a circuit neutron tube formation accelerating pulse voltage on the neutron tube, the ion source neutron tube supply circuit, pulse generating circuit and triggering neutron tube neutron tube. 1 s.p. f. 2 ill.

Description

The utility model relates to the exploration and detection of hidden masses or objects using radioactivity, specifically to the development of power schemes for pulsed neutron generators.

A device is known that contains a serially connected oscillator controlled pulse generator, a voltage inverter, a spark gap and a storage capacitor, the output of which is connected to a neutron emitter. A discharge sensor containing a current transformer and a primary sensor for starting the discharge sensor are introduced into the device, which provide a pulse voltage with a normalized amplitude to the neutron generator, regardless of the malfunction of the device. Patent of the Russian Federation No. 2229751, IPC: G21G 4/02, 2004

The device is cumbersome, consists of separate complexes: a ground-based equipment block, a control and power unit and a downhole tool, a downhole tool with a neutron source, a neutron and gamma-ray registration unit, which reduces their reliability in operation.

A known scheme of a pulsed neutron generator with triggering, switching and neutron tube block components for pulsed neutron logging, consisting of ground control equipment and a time analyzer, power supply, recorder and downhole tool, consisting of a pulsed fast neutron generator based on an accelerator tube with a triggering circuit, containing pulsed high-voltage transformers, a storage capacitor and a controlled switching element of the radiometer, power supplies of the neutron generator c, a radiation detector and an electronic circuit, in the start-up circuit of the accelerator tube between the storage capacitor and the primary windings of pulsed high-voltage transformers, an uncontrolled switching element is connected, and in the circuit of the controlled switching element between its anode and point

connection uncontrolled switching element with the windings of pulse transformers connected an additional capacitor. Patent of the Russian Federation No. 448784, IPC: G01V 5/10, 2000. Prototype.

The circuit is not stable and not reliable when working offline, bulky.

The technical result of the utility model is to increase reliability, increase stability, compactness.

The technical result is achieved in that the circuit of a pulsed neutron generator with triggering, switching, and neutron tube blocks is made in the form of a module of series-connected electronics, switching and neutron tube blocks, the electronics block containing a power filter, a power on / off circuit, and a formation circuit control pulse, the switching unit contains a step-up transformer with rectifiers of the power source of the switching units and the neutron tube, a pulse generating circuit according to the jig of the switch, the feedback voltage divider of the feedback circuit and the switch, the neutron tube unit contains a circuit for generating an accelerating voltage pulse to the neutron tube, a power circuit for the ion source of the neutron tube, a pulse generating circuit for igniting the neutron tube and the neutron tube, and the power filter outputs and power on / off circuits are connected to the inputs of the galvanic isolation of the secondary power sources, and the outputs of the galvanic isolation of the secondary power sources connected to the inputs of a power on / off circuit, a stabilized low-voltage secondary power source and a controlled oscillator, the output of a stabilized low-voltage secondary power source is connected to the inputs of a control pulse formation circuit, a controlled oscillator and a control circuit, the output of a control pulse formation circuit is connected to the inputs of a controlled

the oscillator, control pulse generation circuits, and is also equipped with a terminal for connecting to the switch ignition pulse generation circuit; in the switching unit, one output of the step-up transformer with rectifiers of the power supply of the switching units and the neutron tube is connected to one of the inputs of the switch ignition pulse generation circuit connected to the switch, the second output of the step-up transformer is connected to the inputs of the charge voltage divider in the feedback circuit and the switch, and is also equipped with an output for soy connections with the power supply circuit of the ion source of the neutron tube, the inputs of the circuits for generating an accelerating voltage pulse to the neutron tube, the power supply of the ion source of the neutron tube and the formation of the ignition pulse of the neutron tube are combined, and the outputs of each circuit are connected to the inputs of the neutron tube.

The essence of the utility model is illustrated in figure 1 and figure 2.

Figure 1 presents a diagram of a neutron generator, where: BE - electronics unit; BK - switching unit; BT - tube unit;

1 - power filter, 2 - power on / off circuit, 3 - control pulse formation circuit, 4 - galvanic isolation of secondary power sources, 5 - stabilized low-voltage secondary power source, 6 - controlled oscillator, 7 - step-up transformer with BT power supply rectifiers and BC, 8 is a diagram of the formation of a pulse of ignition of the switch, 9 is a divider of the charging voltage in the feedback circuit, 10 is a switch, 11 is a diagram of the formation of an accelerating voltage pulse to a neutron tube, 12 is a circuit of the ion th source of a neutron tube, 13 is a diagram of the formation of a pulse to ignite a neutron tube, 14 is a neutron tube, 15 is a control circuit.

Figure 2 presents the processes occurring in a neutron generator, where:

t ₀ - the moment of power supply to the input of a pulsed neutron generator (ING)

t ₁ - the receipt of a signal allowing the supply of power to the ING circuit - the beginning of the power supply of BT and BC, the beginning of charging of storage capacitors BT

t ₂ - feedback signal to turn off the power source BT and BC

t ₃ - feedback signal to turn on the power source BT and BC (recharging)

t ₄ - the supply of a control pulse for the triggering of the ING, the command to stop the power source BT and BC, the beginning of the formation of the start pulse of the switch

t ₅ - operation of the switch, the beginning of the formation of accelerating pulses to the neutron tube and current through an ion source

t ₆ - neutron tube actuation - the beginning of the neutron pulse

t ₇ - the end of the neutron pulse

t ₈ - end of transient processes in the neutron tube power circuit, removal of the ban on the operation of the BT and BK power source, the beginning of the repeated process of preparing the ING for the operation of the neutron tube

t ₉ - removal of the signal allowing the operation of the power supply BT and BK, the beginning of the discharge of storage capacitors BT and BK

t ₁₀ - removing power from ING.

The scheme works as follows.

At time t ₀ (figure 2) to the power filter 1 is supplied with external power. Upon receipt of the enable signal t ₁ , all generator power sources begin to work: galvanic isolation of the secondary power sources 4, a stabilized low-voltage secondary power source 5, the oscillator controlled 6 and the storage capacitors of the power circuit 12 and 13 of the neutron tube 14 and the pulse ignition pulse generating circuit 8 begin to charge Upon reaching

charging voltage at time t _2, the feedback signal from the charging voltage divider in feedback circuit 9 stops the operation of the high-voltage power supply 2 (t ₃ ), when the voltage decreases, the feedback again turns on the power supply 2. The control pulse (t ₄ ) is applied to the generator to the circuit for generating the ignition pulse of the switch 8.

The generated control pulse is applied to the ignition gap of the switch 10. At time t _{5, the} switch 10 switches to the conducting state, and positive and negative accelerating pulses and a current pulse begin to form through the ion source of the neutron tube 14. The deuterium ions formed in the current flow into the accelerating the gap, they are accelerated by high voltage and bombard the target, where neutrons with an energy of 14 MeV are formed as a result of the ₁ H ² + ₁ H ³ → ₂ He ⁴ + n reaction.

Claims (1)

A pulsed neutron generator circuit with triggering, switching, and neutron tube unit, characterized in that it is made in the form of a module from series-connected electronics, switching and neutron tube units, the electronics unit containing a power filter, a power on / off circuit, and a formation circuit control pulse, the switching unit contains a step-up transformer with rectifiers of the power supply of the switching units and a neutron tube, a switch ignition pulse generating circuit , the charge voltage divider in the feedback circuit and the switch, the neutron tube block contains a circuit for generating an accelerating voltage pulse to the neutron tube, a power circuit for the ion source of the neutron tube, a circuit for generating a pulse to ignite the neutron tube and the neutron tube, and in the electronics block the outputs of the power filter and circuit power on / off is connected to the inputs of the galvanic isolation of the secondary power sources, and the outputs of the galvanic isolation of the secondary power sources are connected to by the odes of the power on / off circuit, the stabilized low-voltage secondary power source and the controlled oscillator, the output of the stabilized low-voltage secondary power source is connected to the inputs of the control pulse generation circuit, the controlled oscillator and the control circuit, the output of the control pulse generation circuit is connected to the inputs of the controlled oscillator, the pulse formation circuit control, and is also equipped with a terminal for connection to the ignition pulse generation circuit utator, power filter outputs and power on / off circuits are connected to galvanic isolation inputs of secondary power sources, and galvanic isolation outputs of secondary power supplies are connected to inputs of power on / off circuit, stabilized low-voltage secondary power source and controlled oscillator, output of stabilized low-voltage secondary source the power is connected to the inputs of the control pulse generation circuit controlled by the oscillator and the control circuit, the output of the control pulse generation circuit is connected to the inputs of the controlled oscillator, the control pulse generation circuit, and is also equipped with an output for connecting to the switch ignition pulse generation circuit; in the switching unit, one step-up transformer output with rectifiers of the power supply of the switching units and a neutron tube is connected to one of the inputs the ignition pulse generation circuit of the switch connected by the switch, the second output of the step-up transformer is connected to the inputs of the charge divider voltage in the feedback circuit and the switch, and is also equipped with a terminal for connecting to the power supply circuit of the ion source of the neutron tube, the inputs of the circuits for generating an accelerating voltage pulse to the neutron tube, the power supply of the ion source of the neutron tube and the formation of the ignition pulse of the neutron tube are combined, and the outputs of each circuit connected to the inputs of the neutron tube.