CN116133222A - High-energy bunching obtaining device based on TM0n0 mode - Google Patents

High-energy bunching obtaining device based on TM0n0 mode Download PDF

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CN116133222A
CN116133222A CN202111341411.3A CN202111341411A CN116133222A CN 116133222 A CN116133222 A CN 116133222A CN 202111341411 A CN202111341411 A CN 202111341411A CN 116133222 A CN116133222 A CN 116133222A
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cone
truncated cone
cavity
cones
tm0n0
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王群
刘明星
李永卿
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Beijing University of Technology
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Beijing University of Technology
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Plasma & Fusion (AREA)
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  • Spectroscopy & Molecular Physics (AREA)
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Abstract

The invention provides a high-energy bunching obtaining device based on a TM0n0 mode, which comprises the following steps: a cylindrical resonant cavity, two truncated cone-shaped cavities and two cones; the two truncated cone-shaped cavities are respectively connected with two ends of the cylindrical resonant cavity to form a cavity; the bottom surfaces of the two cones are respectively parallel to the top surfaces of the two truncated cone-shaped cavities, cone tips of the two cones are oppositely arranged, and symmetry axes of the two cones are on the same straight line. The invention forms a reflection focusing structure by two round table-shaped cavities, the round table cavities and a cylindrical resonant cavity, conical structures are respectively arranged at the upper end and the lower end in the resonant cavity, the conical positions are adjustable, after microwave energy is fed in to generate resonance, the advantages of TM0n0 mode are utilized, the maximum value is formed in the center, the upper pointed cone generates high field intensity superposition under the action of an electric field, the lower pointed cone is oppositely placed, and the space phase and induced charge generate electric field phase cancellation to reach high energy field intensity in phase with the upper pointed cone.

Description

High-energy bunching obtaining device based on TM0n0 mode
Technical Field
The invention relates to the technical field of microwaves, in particular to a TM0n0 mode-based high-energy beam-forming obtaining device.
Background
The microwave plasma technology can be used for completing a plurality of fields of chemical synthesis, waste gas treatment and the like which are difficult to realize, the excitation of the plasma relates to the magnitude of electromagnetic wave field intensity value, and the plasma is easily excited due to the strong and high-energy aggregation on the spot. However, in the traditional microwave plasma equipment, low power and high field intensity are difficult to achieve, the field intensity value is enhanced by improving power, at the moment, energy is dispersed, the energy utilization rate is low, a large amount of energy is wasted, most of equipment at present excites plasma by improving vacuum degree, but the ventilation amount is required to be low to ensure the vacuum degree, and high-efficiency and rapid reaction synthesis is difficult to achieve. A high-energy beam field obtaining device based on a TM0n0 mode is adopted. The plasma can be rapidly excited in a low-power, normal-pressure or positive-pressure state, and the field intensity is focused, so that more energy is utilized to excite the plasma. The utilization rate of energy is improved. Greatly promotes the production speed of the microwave plasma reaction system.
The excitation of microwave plasma is that the gas molecules are separated from atomic nuclei after being influenced by high field intensity, the electrons are changed into free electrons after being separated from the atomic nuclei, and then the free electrons are acted by electromagnetic wave electric field to generate great kinetic energy to impact other gas molecules so as to form electrons and ions. A plasma is continuously formed, leaving the high field strength region, and the ions formed are repolymerized to produce the desired product.
The efficiency of microwave systems depends on whether the energy is fully utilized for plasma energy generation, and traditionally the increased vacuum and the increased feed of energy employed are unreasonable, with vacuum limiting the rate of generation, and a single feed of energy results in a large amount of energy dissipation.
Disclosure of Invention
The invention provides a TM0n0 mode-based high-energy bunching obtaining device, which is used for solving the defects of severe plasma excitation condition, low production rate and low energy utilization rate in the prior art, realizing that high power is not needed, vacuum is not needed, and rapidly exciting plasma under normal pressure and positive pressure conditions, and improving reaction rate and energy utilization rate.
The invention provides a high-energy bunching obtaining device based on a TM0n0 mode, which comprises the following components: a cylindrical resonant cavity, two truncated cone-shaped cavities and two cones;
the two truncated cone-shaped cavities are respectively connected with two ends of the cylindrical resonant cavity to form a cavity;
the bottom surfaces of the two cones are respectively parallel to the top surfaces of the two truncated cone-shaped cavities, cone tips of the two cones are oppositely arranged, and symmetry axes of the two cones are on the same straight line.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode, the two cones are movably connected with the corresponding truncated cone-shaped top surface, and the cones move up and down along the symmetry axis.
Further, according to the high-energy beam focusing obtaining device based on the TM0n0 mode provided by the invention, the cylindrical resonant cavity and the cavity walls of the two truncated cone-shaped cavities form the boundary of the nth half-wave resonance of the corresponding TM0n0 mode field.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, the bottom diameter D1 and the top diameter D and the height h of the circular truncated cone-shaped cavity and the radius D of the cylindrical resonant cavity meet the following conditions: d=d1=2d=4h.
Further, according to the high-energy beam forming device based on the TM0n0 mode provided by the invention, an angle between a contact plane between the truncated cone-shaped cavity and the cylindrical resonant cavity is 45 degrees.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, two truncated cone-shaped cavities are connected to two ends of the cylindrical resonant cavity through welding or flanges.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode, the bottom of the cone is fixed on the supporting rod, the supporting rod penetrates through the center of the top surface of the round table-shaped cavity, and the position of the conical tip of the cone is adjusted by adjusting the length of the supporting rod extending into the cylindrical resonant cavity.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode, the two cones are made of high-temperature resistant conductive materials.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode, the supporting rod is of a screw rod structure, and the central hole of the top surface of the round table-shaped cavity is provided with an internal thread which is matched with the screw rod.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, the cylindrical resonant cavity and the two truncated cone-shaped cavities are made of conductive materials.
The invention provides a high-energy bunching obtaining device based on a TM0n0 mode, which comprises the following steps: a cylindrical resonant cavity, two truncated cone-shaped cavities and two cones; the two truncated cone-shaped cavities are respectively connected with two ends of the cylindrical resonant cavity to form a cavity; the bottom surfaces of the two cones are respectively parallel to the top surfaces of the two truncated cone-shaped cavities, cone tips of the two cones are oppositely arranged, and symmetry axes of the two cones are on the same straight line. The invention forms a reflection focusing structure by two round table-shaped cavities, the round table cavities and a cylindrical resonant cavity, conical structures are respectively arranged at the upper end and the lower end in the resonant cavity, the conical positions are adjustable, after microwave energy is fed in to generate resonance, the advantages of TM0n0 mode are utilized, the maximum value is formed in the center, the upper pointed cone generates high field intensity superposition under the action of an electric field, the lower pointed cone is oppositely placed, and the space phase and induced charge generate electric field phase cancellation to reach high energy field intensity in phase with the upper pointed cone.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a structure of a high-energy beam-focusing field obtaining device based on TM0n0 mode according to the present invention;
FIG. 2 is a schematic diagram of a resonant cavity structure formed by a cylindrical resonant cavity and a truncated cone-shaped cavity;
FIG. 3 is a magnetic field profile of a TM020 eigenmode field provided by the present invention;
FIG. 4 shows the field strength without a cone in the resonator (left) and the field strength variation with a cone (right);
FIG. 5 is a graph showing the contrast of the TM020 mode electric field distribution when no cone is arranged in the resonant cavity;
FIG. 6 is a graph of the dimensional relationship of a frustoconical cavity to a cylindrical cavity provided by the present invention;
FIG. 7 is a graph of angular relationship of a frustoconical cavity to a cylindrical resonant cavity provided by the present invention;
reference numerals:
1: an upper cone; 2: a lower cone; 3: an upper truncated cone-shaped cavity;
4: a cylindrical resonant cavity; 5: a lower circular truncated cone-shaped cavity; 6: a cone;
7: a truncated cone-shaped cavity.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A high-energy beamforming acquisition device based on TM0n0 mode according to the present invention is described below with reference to fig. 1, including: a cylindrical resonant cavity 4, two truncated cone-shaped cavities 7 and two cones 6;
the two truncated cone-shaped cavities 7 are respectively connected with two ends of the cylindrical resonant cavity 4;
the bottom surfaces of the two cones 6 are respectively parallel to the top surfaces of the two circular truncated cone-shaped cavities 7, the cone tips of the two cones 6 are oppositely arranged, and the symmetry axes of the two cones 6 are on the same straight line.
Specifically, when the cylindrical resonant cavity 4 excites the TM0n0 mode, the electromagnetic wave forms a maximum value in the center, but when microwave power is fed in, the maximum field intensity value is only very low, plasma is difficult to excite in practical application, energy coupling is unsmooth, and energy is lost in a large amount.
When the inside of the resonant cavity does not contain the conical 6 structure, as shown in fig. 2, when the cylindrical resonant cavity resonates in TM mode, the internal electromagnetic field expression is:
Figure BDA0003352204900000051
wherein: e (E) z 、E ρ 、
Figure BDA0003352204900000052
The electric fields of the resonant cavities are respectively z, ρ and +.>
Figure BDA0003352204900000053
A directional component; h ρ 、/>
Figure BDA0003352204900000054
The magnetic field delay rho and the magnetic field delay rho of the resonant cavity are respectively shown as->
Figure BDA0003352204900000055
A directional component; e (E) mnp Is the amplitude of the electromagnetic wave electric field; omega is the angular frequency of electromagnetic waves; epsilon is the dielectric constant of the medium; k (k) c Is a cut-off wave number; j (J) m (x) Is an m-order Bessel function; m is electromagnetic wave delay->
Figure BDA0003352204900000056
Half wave number of direction; n is half wave number of electromagnetic wave along rho direction; p is half wave number of electromagnetic wave along z direction; l is the length of the resonant cavity.
For example, when the resonance mode is TM020, the electromagnetic field expression is:
Figure BDA0003352204900000061
referring to fig. 3, the distribution of electromagnetic waves in the TM020 eigenmode field can be seen.
Referring to fig. 4, when the circular truncated cone-shaped cavity 7 is added to the cylindrical resonant cavity 4, the electromagnetic wave is less influenced, namely, the feeding power is 9000W when the resonant cavity is cylindrical, the electromagnetic wave distribution is still TM020 mode when the circular truncated cone-shaped cavity 7 is adopted up and down, the influence of the circular truncated cone-shaped cavity 7 on the mode is small, and the electric field distribution form is observed, it is known that the upper circular truncated cone-shaped cavity 3 and the lower circular truncated cone-shaped cavity 5 can reflect the electromagnetic wave to the center of the resonant cavity, but the maximum field intensity value is only 64116V/m,
when the cone 6 is added in the conical cavity 7, the electric field distribution near the cone 6 changes the electromagnetic wave boundary condition, the cone structure can be tuned, the TM0n0 mode is excited, and the field intensity value can be improved by two orders of magnitude.
Taking the TM020 mode as an example, when microwave energy is fed, the electromagnetic wave resonates, along with
Figure BDA0003352204900000062
And z direction is a definite value, so the electromagnetic field distribution is axisymmetric along the center, and there are two half waves along the ρ direction, thus the electric field distribution when the TM020 mode is excited by resonance in the resonant cavity can be obtained as shown by the thin line in figure 5, the electromagnetic field forms the maximum value in the center beam after forming the mode, but even when the high energy is fed in, the maximum value of the field does not reach the condition of exciting plasma, two cones 6 are arranged at the upper end and the lower end of the resonant cavity respectively, the high energy of the exciter gathers the beam field, the field intensity (as shown by the thick black line in figure 5) can be rapidly increased to excite the plasma, and the microwave energy is continuously coupled to the plasma.
After the electromagnetic wave enters the resonant cavity, the truncated cone-shaped cavity 7 and the cylindrical resonant cavity 4 form a reflection focusing structure, so that the electric field vector of the electromagnetic wave is conducive to accumulation of tip charges, the electromagnetic wave forms an electric field near the cone 6, the cone 6 induces charges, the charges are accumulated to form high field intensity, the electric field formed by the charges and the mode field intensity generated by resonance of the resonant cavity are overlapped in phase to form ultrahigh field intensity, the field distribution form of TM0n0 mode is utilized, the electric field formed by TM0n0 mode is fixed in the z direction, two half wave numbers are arranged in the radial direction of the cylindrical resonant cavity, the maximum value of the electric field is located at the center of the cylindrical resonant cavity, and the electric field is overlapped with the high field intensity of the cone 6 to form the whole central high-energy beam.
The lower cone 2 is placed in the opposite direction to the upper cone 1, the cone 6 is spatially 180 degrees out of phase, but the lower cone 2 is affected by the electric field generated by the electromagnetic wave, generating negative charge accumulation, and the formed electric field is 180 degrees out of phase with the electric field formed by the positive charge, so that the spatial phase difference and the phase difference of the electric field generated by the electric charge cancel, and therefore, the electric field is in phase with the top at the bottom. Forming the whole high energy beam-forming field.
The invention provides a high-energy bunching obtaining device based on a TM0n0 mode, which comprises the following steps: a cylindrical resonant cavity 4, two truncated cone-shaped cavities 7 and two cones 6; the two truncated cone-shaped cavities 7 are respectively connected with two ends of the cylindrical resonant cavity 4; the bottom surfaces of the two cones 6 are respectively parallel to the top surfaces of the two circular truncated cone-shaped cavities 7, the cone tips of the two cones 6 are oppositely arranged, and the symmetry axes of the two cones 6 are on the same straight line. The invention forms a reflection focusing structure by two round table-shaped cavities 7, the round table cavities and a cylindrical resonant cavity, the upper end and the lower end of the inside of the resonant cavity are respectively provided with a cone 6 structure, the positions of the cones 6 are adjustable, after microwave energy is fed in to generate resonance, the maximum value is formed in the center by utilizing the advantages of a TM0n0 mode, the upper cone 1 generates high field intensity superposition under the action of an electric field, the lower cone 2 is oppositely placed, and the space phase and induced charge generate electric field phase cancellation to reach the high energy field intensity in phase with the upper cone 1.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, the two cones 6 are movably connected with the corresponding truncated cone-shaped top surfaces, and the cones 6 move up and down along the symmetry axis.
Specifically, the cone 6 is movably connected so that the cone 6 can move up and down, thereby enabling the cone 6 to move to the center region of the electromagnetic field. Enabling the cone 6 to generate a large charge accumulation in accordance with the electromagnetic field in the central region.
Further, according to the high-energy beam focusing device based on the TM0n0 mode provided by the invention, the cylindrical resonant cavity 4 and the cavity walls of the two truncated cone-shaped cavities 7 form boundaries of the nth half-wave resonance of the corresponding TM0n0 mode field.
Specifically, after the electromagnetic wave enters the resonant cavity, the truncated cone cavity and the cylinder form a reflection focusing structure, so that the electric field vector of the electromagnetic wave contributes to accumulation of tip charges. The electric field formed by TM0n0 mode is fixed in z direction by using the field distribution form of TM0n0 mode, and two half wave numbers are arranged in the radial direction of the cylindrical resonant cavity.
Further, according to the high-energy beam forming device based on the TM0n0 mode provided by the invention, the bottom diameter D1 and the top diameter D, the height h of the truncated cone-shaped cavity 7 and the radius D of the cylindrical resonant cavity 4 satisfy: d=d1=2d=4h.
Specifically, as shown in fig. 6, the truncated cone-shaped cavity 7 and the TM0n0 mode cylindrical cavity 4 are jointly constructed as an electromagnetic wave focusing structure, and the dimensions thereof satisfy the condition: d=2d=4h, and the electromagnetic wave is transmitted to the resonant cavity and then continuously reflected and transmitted.
Further, according to the present invention, there is provided a TM0n0 mode-based high-energy beam forming apparatus, wherein an angle between a contact plane between the circular truncated cone-shaped cavity 7 and the cylindrical cavity 4 is 45 °.
Specifically, as shown in fig. 7, a cavity angle is set at the position of the circular truncated cone cavity, electromagnetic waves are reflected to the cone 6 to finally form mode resonance, electric field distribution meets conductor boundary conditions, electric field distribution near the cone 6 is used, opposite charges are induced on the surface of the cone 6, electrons are promoted to move towards the bottom end of the cone 6, the positive charge quantity of the tip of the cone 6 is further increased, and high field intensity is generated by the positive charges.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, two truncated cone-shaped cavities 7 are connected to two ends of the cylindrical resonant cavity 4 through welding or flanges.
Specifically, the truncated cone-shaped cavity 7 is formed integrally with the cylindrical cavity 4.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, the bottom of the cone 6 is fixed on the supporting rod, the supporting rod penetrates through the center of the top surface of the round table-shaped cavity 7, and the position of the cone tip of the cone 6 is adjusted by adjusting the length of the supporting rod extending into the cylindrical resonant cavity 4.
Specifically, the cone 6 is connected with the supporting rod, the other end of the supporting rod extends out of the circular truncated cone-shaped cavity 7, and the position of the cone tip of the cone 6 is adjusted by adjusting the length of the supporting rod which is arranged in the cylindrical resonant cavity 4, so that the cone tip of the cone 6 is positioned at the center position of the electromagnetic field.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, the two cones 6 are made of high-temperature resistant conductive materials.
Specifically, since the cone 6 serves to collect electric charges, the material of the cone 6 is a conductor, and on the other hand, a large amount of electric charges are collected, so that the cone 6 needs to have an effect of withstanding high temperatures. Thus, the material of the cone 6 is selected to be a high temperature resistant conductive material, such as a graphite material or the like.
Further, according to the high-energy bunching obtaining device based on the TM0n0 mode provided by the invention, the supporting rod is of a screw structure, and the central hole of the top surface of the round table-shaped cavity 7 is provided with an internal thread which is matched with the screw.
Specifically, by setting the support rod to a screw structure, fine adjustment can be achieved by adjusting the position of the cone 6 in a rotating manner.
Further, according to the high-energy beam forming device based on the TM0n0 mode provided by the invention, the cylindrical resonant cavity 4 and the two truncated cone-shaped cavities 7 are made of conductive materials.
Specifically, the cylindrical resonant cavity 4 and the two truncated cone-shaped cavities 7 may be made of various materials such as cobalt, nickel, iron, etc.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. The foregoing is merely illustrative of the preferred embodiments of this invention, and it is noted that there is objectively no limit to the specific structure disclosed herein, since numerous modifications, adaptations and variations can be made by those skilled in the art without departing from the principles of the invention, and the above-described features can be combined in any suitable manner; such modifications, variations and combinations, or the direct application of the inventive concepts and aspects to other applications without modification, are contemplated as falling within the scope of the present invention.

Claims (10)

1. A TM0n0 mode-based high-energy beamforming acquisition device, comprising: a cylindrical resonant cavity, two truncated cone-shaped cavities and two cones;
the two truncated cone-shaped cavities are respectively connected with two ends of the cylindrical resonant cavity to form a cavity;
the bottom surfaces of the two cones are respectively parallel to the top surfaces of the two truncated cone-shaped cavities, cone tips of the two cones are oppositely arranged, and symmetry axes of the two cones are on the same straight line.
2. The TM0n0 mode-based high-energy bunching device of claim 1, wherein the two cones are movably connected to the corresponding truncated cone-shaped top surface, and the cones move up and down along the symmetry axis.
3. The TM0n0 mode-based high energy beamforming acquisition device according to claim 1, wherein the cylindrical resonant cavity and the cavity walls of the two truncated cone shaped cavities form the boundary of the nth half-wave resonance of the corresponding TM0n0 mode field.
4. A TM0n0 mode based high energy bunching device according to claim 3, wherein the bottom diameter D1 and the top diameter D, the height h of the truncated cone-shaped cavity and the radius D of the cylindrical cavity satisfy: d=d1=2d=4h.
5. The TM0n0 mode based high energy beamforming acquisition device according to claim 4, wherein the angle between the contact plane between the truncated cone shaped cavity and the cylindrical resonator is 45 °.
6. The TM0n0 mode-based high energy bunching device of claim 1, wherein two truncated cone shaped cavities are connected at both ends of the cylindrical cavity by welding or flanges.
7. The TM0n0 mode-based high-energy bunching device of claim 1, wherein the bottom of the cone is fixed on a support rod, the support rod penetrates through the center of the top surface of the circular truncated cone-shaped cavity, and the position of the cone tip of the cone is adjusted by adjusting the length of the support rod extending into the cylindrical resonant cavity.
8. The TM0n0 mode-based high energy bunching device of claim 1, wherein the two cones are made of a high temperature resistant conductive material.
9. The TM0n0 mode-based high-energy bunching device of claim 7, wherein the support rod has a screw structure, and the central hole of the top surface of the truncated cone-shaped cavity has an internal thread to match with the screw.
10. The TM0n0 mode-based high energy beamforming acquisition device according to claim 1, wherein the cylindrical resonator and the two frustoconical cavities are made of an electrically conductive material.
CN202111341411.3A 2021-11-12 2021-11-12 High-energy bunching obtaining device based on TM0n0 mode Pending CN116133222A (en)

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CN202111341411.3A CN116133222A (en) 2021-11-12 2021-11-12 High-energy bunching obtaining device based on TM0n0 mode

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Application Number Priority Date Filing Date Title
CN202111341411.3A CN116133222A (en) 2021-11-12 2021-11-12 High-energy bunching obtaining device based on TM0n0 mode

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CN116133222A true CN116133222A (en) 2023-05-16

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