Compact gyrotron terahertz source device based on pulsed intense magnetic field

Abstract

The application belongs to the technical field of electric vacuum devices, and discloses a compact gyrotron terahertz source device based on a pulsed strong magnetic field, which comprises a power supply unit and a gyrotron tube body; a cathode for generating an electron beam and a resonant cavity serving as an electron beam channel are arranged on the gyrotron tube body, and the outer side circumferential wall of the electron beam channel of the gyrotron tube body serves as an anode; a coil unit for generating a pulsed magnetic field is arranged on the outer side circumferential wall of the electron beam channel of the gyrotron tube body; the coil unit comprises a continuous electric conductor, and the electric conductor is helically wound around the gyrotron tube body for multiple turns; the coil unit and the gyrotron tube body are connected in series in the same circuit, so that the current generated by the same power supply sequentially flows through the coil unit and the gyrotron tube body, thereby effectively solving the problems of complex structure, poor synchronous control precision and large energy loss of the conventional double-power-supply system, and improving the working reliability and energy utilization efficiency of the terahertz source device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric vacuum devices, and particularly relates to a compact gyrotron terahertz source device based on a pulsed strong magnetic field. BACKGROUND

[0002] As an electric vacuum device for generating high-power terahertz radiation, the gyrotron has a broad application prospect in the fields of imaging, communication, spectral detection and the like; when the gyrotron terahertz source system is working, power needs to be supplied to both the magnetic field coil and the gyrotron tube body; in the prior art, two completely independent power supply systems are used for the gyrotron terahertz source system, one of which is used to drive the magnetic field coil to generate a constant magnetic field, and the other of which is used to excite the gyrotron to generate an electron beam; however, the two independent power supply systems not only increase the complexity and cost of the system, but also lead to a large size of the gyrotron terahertz source system; in addition, the magnetic field coil needs to be continuously excited to consume energy, while the gyrotron works in a pulsed mode, resulting in a large waste of magnetic field energy during the intermittent period of the pulse; more importantly, the timing control between the two independent power supply systems is difficult to synchronize, and the timing deviation of the two systems will cause the electron beam and the magnetic field to be mismatched, resulting in electron beam defocusing and interaction efficiency reduction, which directly affects the output power and stability of the terahertz wave; therefore, the double-power supply system in the prior art has the problems of complex structure, poor synchronization control precision and large energy loss. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the present application is to provide a compact gyrotron terahertz source device based on a pulsed strong magnetic field, which solves the problems of complex structure, poor synchronization control precision and large energy loss of the double-power supply system in the prior art.

[0004] The purpose of the present application can be achieved by the following technical solutions:

[0005] The compact gyrotron terahertz source device based on a pulsed strong magnetic field comprises a power supply part and a gyrotron tube body.

[0006] The gyrotron tube body is provided with a cathode for generating an electron beam and a resonant cavity as an electron beam channel, and the outer side wall of the electron beam channel of the gyrotron tube body serves as an anode.

[0007] The outer side wall of the electron beam channel of the gyrotron tube body is provided with a coil unit for generating a pulsed magnetic field.

[0008] The coil unit comprises a continuous conductive body, the conductive body is spirally wound around the gyrotron tube body for multiple turns, and gaps are left between adjacent turns of the conductive body.

[0009] The innermost end of the coil unit serves as an output end, and the outermost end of the coil unit serves as an input end.

[0010] The input end of the coil unit is electrically connected with the positive pole of the power supply unit;

[0011] The output end of the coil unit is fixed with and electrically connected with the anode;

[0012] The cathode of the gyrotron tube body is grounded with the negative pole of the power supply unit;

[0013] The power supply unit synchronously supplies power to the gyrotron tube body and the coil unit, the electron beam and the pulsed magnetic field are synchronously generated, the beam-wave interaction is carried out at the resonant cavity of the gyrotron tube body, and the terahertz wave signal is generated.

[0014] Further, the coil unit further comprises a first insulation unit made of an insulation material, the first insulation unit is arranged along the gap between the adjacent conductive bodies in the coil unit, and the first insulation unit forms electrical isolation between the adjacent conductive bodies.

[0015] Further, the conductive body and the first insulation unit jointly form a cylindrical structure sleeved on the gyrotron tube body.

[0016] Further, the output end of the coil unit is further connected with a second line for grounding, the first resistance is connected in series in the second line, the first resistance is connected in parallel with the gyrotron tube body, and the equivalent resistance of the gyrotron tube body is greater than the resistance of the first resistance.

[0017] Further, the joint between the conductive body and the first insulation unit is coated with a second insulation unit, and the second insulation unit is made of a solidified material with insulation.

[0018] Further, the resonant cavity of the gyrotron tube body is provided with a collector away from the cathode, and a window piece made of sapphire is fixedly installed in the collector.

[0019] Further, the conductive body comprises any one of a copper foil, a silver foil, a gold foil or an aluminum foil.

[0020] Further, the material of the first insulation unit comprises any one of polypropylene, polyethylene or polyimide.

[0021] Further, the material of the second insulation unit comprises any one of epoxy resin, silica gel or insulation oil.

[0022] The beneficial effects of the present application are as follows:

[0023] 1、The application is connected in series with the gyrotron tube body in the same circuit through the coil unit, the current generated by the power supply part flows through the coil unit and the gyrotron tube body in turn, the current acts on the coil unit to generate a pulsed magnetic field, and at the same time, the current acts on the gyrotron tube body to generate an electron beam; since the pulsed magnetic field and the electron beam are both excited by the current in the same series circuit, the intensity change of both follows the current change, and the generation of the pulsed magnetic field and the electron beam is highly consistent in time sequence, effectively solving the problems of complex structure, poor synchronous control precision and large energy loss existing in the traditional dual-power supply system, significantly improving the working reliability and energy utilization efficiency of the terahertz source device;

[0024] At the same time, by arranging the coil unit on the peripheral wall of the gyrotron tube body, the integrated arrangement of the coil unit and the gyrotron tube body is realized, and the compactness of the overall structure is effectively improved.

[0025] 2、By filling the first insulating part made of insulating material in the gap of each coil conductor of the coil unit, the electrical isolation effect is effectively realized, preventing the problem of electric field breakdown between adjacent coil conductors due to high voltage operation, and at the same time, the first insulating part fixes and restricts the relative position of each coil conductor, effectively resisting the electromagnetic stress generated by the pulse current to prevent the deformation or loosening of the conductor structure. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a cross-sectional structure schematic diagram of the gyrotron tube body and the coil unit of the application;

[0028] Figure 2 is a cross-sectional schematic diagram of the coil unit along the axial direction of the gyrotron tube body of the application;

[0029] Figure 3 is a schematic diagram of the compact gyrotron terahertz source device of the application; Figure 2 is a local enlarged structure schematic diagram of part A in the application;

[0030] Figure 4 is a partial circuit schematic diagram of the compact gyrotron terahertz source device of the application. DETAILED DESCRIPTION

[0031] Clearly, the embodiments described are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0032] As shown in the drawings, the compact gyrotron terahertz source device based on a pulsed strong magnetic field comprises a power supply part 200 and a gyrotron tube body 100; Figures 1 to 4

[0033] The gyrotron tube body 100 is provided with a cathode for generating an electron beam and a resonant cavity 105 as an electron beam channel, and the outer side wall of the electron beam channel of the gyrotron tube body 100 serves as an anode 103;

[0034] The outer side wall of the electron beam channel of the gyrotron tube body 100 is provided with a coil unit 300 for generating a pulsed magnetic field;

[0035] The coil unit 300 comprises a continuous conductive body 301, which is spirally wound around the gyrotron tube body 100 for multiple turns, and gaps are left between adjacent turns of the conductive body 301;

[0036] The innermost end of the coil unit 300 serves as an output end, and the outermost end of the coil unit 300 serves as an input end;

[0037] The input end of the coil unit 300 is electrically connected to the positive electrode of the power supply part 200;

[0038] Only the output end of the coil unit 300 is fixedly and electrically connected to the anode 103;

[0039] The cathode of the gyrotron tube body 100 and the negative electrode of the power supply part 200 are both grounded;

[0040] The power supply part 200 synchronously supplies power to the gyrotron tube body 100 and the coil unit 300, the electron beam and the pulsed magnetic field are synchronously generated, and the beam-wave interaction is carried out at the resonant cavity 105 of the gyrotron tube body 100 to generate a terahertz wave signal;

[0041] It should be noted that the gyrotron tube body 100 is provided with a cathode electron gun part 106, the output end of the cathode electron gun part 106 faces the window sheet 102, the cathode electron gun part 106 is used for emitting an electron beam, the remaining energy of the electron beam after interaction is absorbed and consumed by the collector 101, and the terahertz signal is output through the sapphire window sheet 102;

[0042] Preferably, the gyrotron tube body 100 is provided with an insulating ceramic 104 away from the outer side wall of the electron beam channel;

[0043] ​Preferably, the power supply unit 200 can be selected from non-polar film capacitors such as metallized polypropylene capacitors, polyester film capacitors, etc., with a rated voltage greater than 25kV.

[0044] When the gyrotron tube 100 is powered on, the cathode electron gun component 106 generates an electron beam, which passes through the resonant cavity 105; the gyrotron tube 100 is a prior art, and will not be described in detail in this application;

[0045] The coil unit 300 is arranged on the peripheral wall of the gyrotron tube 100, achieving integrated arrangement of the coil unit 300 and the gyrotron tube 100 in a conformal manner, effectively improving the compactness of the overall structure; and the coil unit 300 and the gyrotron tube 100 are connected in series in the same circuit, so that the current generated by the same power supply flows through the coil unit 300 and the gyrotron tube 100 in turn, the current acting on the coil unit 300 generates a pulsed magnetic field, and the current acting on the gyrotron tube 100 generates an electron beam; since the pulsed magnetic field and the electron beam are both excited by the current in the same series circuit, the intensity of both changes in accordance with the change of the current, and the generation of the pulsed magnetic field and the electron beam naturally maintains consistency in time sequence, effectively solving the problems of complex structure, poor synchronization control precision and large energy loss in the traditional dual-power supply system, and significantly improving the working reliability and energy utilization efficiency of the terahertz source device.

[0046] The coil unit 300 further comprises a first insulating part 302 made of insulating material, which is arranged along the gap between adjacent turns of the coil unit 300, and the first insulating part 302 forms electrical isolation between adjacent turns of the coil unit 300, preventing electrical field breakdown of the coil when working at high voltage;

[0047] Since the coil unit 300 in the present application works at high voltage, the first insulating part 302 made of insulating material is filled in the gap between the turns of the coil unit 300, which can effectively prevent the electrical field breakdown between adjacent turns of the coil unit 300 due to high voltage, effectively achieving the effect of electrical isolation; at the same time, the first insulating part 302 fixes and restricts the relative position of the turns of the coil unit 300, effectively resisting the electromagnetic stress generated by the pulse current, to prevent deformation or loosening of the conductive body 301.

[0048] The conductive body 301 and the first insulating part 302 together form a cylindrical structure that is sleeved on the gyrotron tube 100;

[0049] The regular spiral path improves the uniformity of the axial magnetic field distribution to optimize the electron beam confinement efficiency.

[0050] The positive pole of the power supply unit 200 is electrically connected with the input end of the coil unit 300 through the first circuit 400;

[0051] The output end of the coil unit 300 is also connected with a second circuit for grounding, and the first resistor 500 is connected in series in the second circuit, and the first resistor 500 is connected in parallel with the gyrotron tube body 100, and the equivalent resistance of the gyrotron tube body 100 is greater than the resistance of the first resistor 500;

[0052] It should be noted that the resistance of the equivalent resistance of the gyrotron tube body 100 is much greater than the resistance of the first resistor 500;

[0053] Through the setting of the first resistor 500, when the power supply unit 200 is turned on, the current flowing through the coil unit 300 is controlled to be a kA-level pulse current, and the current flowing through the gyrotron tube body 100 is a mA-level pulse current, and under the premise that the current timing of the two is synchronized, the current of the coil unit 300 and the gyrotron tube body 100 is precisely adjusted.

[0054] The joint between the conductive body 301 and the first insulation part 302 is coated with a second insulation part, and the second insulation part is made of a cured material with insulation;

[0055] The second insulation part makes the first insulation part 302 and the conductive body 301 form a stable overall structure.

[0056] The resonant cavity 105 of the gyrotron tube body 100 is provided with a collector 101 away from one end of the cathode, and the window sheet 102 made of sapphire material is fixedly installed in the collector 101, so as to realize the transmission and radiation output of the microwave signal;

[0057] Through the window sheet 102 made of sapphire material, the effective penetration of terahertz signals and the reliable sealing of the vacuum cavity in the gyrotron tube body 100 are realized, and the heat generated by the electron beam bombardment of the collector 101 is quickly dissipated by using the high heat conduction performance of sapphire, thereby avoiding the problem of window sheet 102 rupture caused by heat accumulation, and improving the reliability of the operation of the gyrotron tube body 100.

[0058] The conductive body 301 includes any one of copper foil, silver foil, gold foil or aluminum foil;

[0059] Preferably, the outer diameter of the part of the gyrotron tube body 100 sleeved with the coil unit 300 is 11mm;

[0060] Preferably, the conductive body 301 can select a long strip of copper foil with an axial cross-sectional size of a width of 15mm and a thickness of 0.1mm;

[0061] Preferably, the copper foil strip is wound clockwise along the circumferential side of the gyrotron tube body 100 for 30 turns.

[0062] The material of the first insulation part 302 includes any one of polypropylene, polyethylene, polyimide, polyester and other high molecular insulation materials.

[0063] The material of the second insulation part includes any one of epoxy resin, silica gel, silicone gel and insulating oil.

[0064] Preferably, the gyrotron tube 100 is also provided with an air extraction system for extracting air from the hollow cavity of the gyrotron tube 100, so that the whole system can be used in a dynamic vacuum system environment.

[0065] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only illustrative of the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A compact gyrotron terahertz source device based on a pulsed strong magnetic field, comprising a power supply unit (200) and a gyrotron body (100), wherein the gyrotron body (100) is provided with a cathode for generating an electron beam and a resonant cavity (105) serving as an electron beam channel, and the outer peripheral wall of the electron beam channel of the gyrotron body (100) serves as an anode (103), characterized in that: A coil unit (300) for generating a pulsed magnetic field is arranged on the outer peripheral wall of the electron injection channel of the gyrotube body (100). The coil unit (300) includes a continuous conductor (301) which is spirally wound multiple times around the circumference of the electron injection channel of the gyrotube body (100), and there is a gap between adjacent turns of the conductor (301). The innermost end of the coil unit (300) is used as the output end, and the outermost end of the coil unit (300) is used as the input end; The input terminal of the coil unit (300) is electrically connected to the positive terminal of the power supply unit (200); The output end of the coil unit (300) is fixed and electrically connected to the gyro tube body (100) which serves as the anode (103); The cathode of the gyrotube body (100) and the negative terminal of the power supply section (200) are both grounded; The power supply unit (200) synchronously supplies power to the gyro tube body (100) and the coil unit (300), and the electron beam and pulse magnetic field are generated synchronously. The beam-wave interaction is performed at the resonant cavity (105) of the gyro tube body (100) to generate a terahertz wave signal.

2. The compact gyrotron terahertz source device according to claim 1, characterized in that, The coil unit (300) also includes a first insulating portion (302) made of insulating material, which is arranged along the gap between adjacent coil conductors (301) in the coil unit (300) and forms electrical isolation between adjacent coil conductors (301).

3. The compact gyrotron terahertz source device according to claim 2, characterized in that, The conductor (301) and the first insulating part (302) together form a cylindrical structure sleeved on the rotary tube body (100).

4. The compact gyrotron terahertz source device according to claim 2, characterized in that, The output terminal of the coil unit (300) is also connected to a second line for grounding. A first resistor (500) is connected in series in the second line. The first resistor (500) is connected in parallel with the gyro tube body (100). The equivalent resistance of the gyro tube body (100) is greater than the resistance of the first resistor (500).

5. The compact gyrotron terahertz source device according to claim 2, characterized in that, A second insulating part is coated in the joint between the conductor (301) and the first insulating part (302), and the second insulating part is made of a curing material with insulating properties.

6. The compact gyrotron terahertz source device according to claim 1, characterized in that, The resonant cavity (105) of the gyro tube body (100) is provided with a collector electrode (101) at the end away from the cathode, and a window (102) made of sapphire material is fixedly installed inside the collector electrode (101).

7. The compact gyrotron terahertz source device according to claim 1, characterized in that, The conductor (301) includes any one of copper foil, silver foil, gold foil or aluminum foil.

8. The compact gyrotron terahertz source device according to claim 2, characterized in that, The material of the first insulating part (302) includes any one of polypropylene, polyethylene or polyimide.

9. The compact gyrotron terahertz source device according to claim 5, characterized in that, The material of the second insulation part includes any one of epoxy resin, silicone or insulating oil.

Images