CN114512297A - Magnetic gain switch and method based on flat-top pulse magnetic field - Google Patents
Magnetic gain switch and method based on flat-top pulse magnetic field Download PDFInfo
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- CN114512297A CN114512297A CN202210049963.5A CN202210049963A CN114512297A CN 114512297 A CN114512297 A CN 114512297A CN 202210049963 A CN202210049963 A CN 202210049963A CN 114512297 A CN114512297 A CN 114512297A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/03—Constructional details of gas laser discharge tubes
- H01S3/032—Constructional details of gas laser discharge tubes for confinement of the discharge, e.g. by special features of the discharge constricting tube
- H01S3/0326—Constructional details of gas laser discharge tubes for confinement of the discharge, e.g. by special features of the discharge constricting tube by an electromagnetic field
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention discloses a magnetic gain switch and a method based on a flat-top pulse magnetic field, and belongs to the field of magnetic gain switches. The device comprises a resonant cavity, a permanent magnet and an electromagnetic coil, wherein the permanent magnet generates a constant magnetic field in the resonant cavity, and the electromagnetic coil generates a flat-topped pulse magnetic field in the resonant cavity; the two permanent magnets are respectively positioned above and below the resonant cavity, the two electromagnetic coils are respectively positioned at the outer sides of the two permanent magnets, the permanent magnets and the electromagnetic coils completely and independently operate, the duration of a constant magnetic field generated by the permanent magnets is determined by the time interval between two flat-top pulse magnetic fields, the rising edge of the flat-top magnetic field is extremely short, and the peak value of the magnetic field is in the same direction as the constant magnetic field generated by the permanent magnets. According to the magnetic gain switch based on the flat-top pulse magnetic field, the permanent magnet constant magnetic field and the flat-top pulse magnetic field are combined, so that the synthetic magnetic field in the resonant cavity can be rapidly reduced and emptied, and the power gain of the magnetic gain switch is greatly improved.
Description
Technical Field
The invention belongs to the field of magnetic gain switches, and particularly relates to a magnetic gain switch and a method based on a flat-top pulse magnetic field.
Background
The laser generated by the Chemical Oxygen Iodine Laser (COIL) has extremely high coupling efficiency to metal, and has great application prospect in the aspects of directional energy weapons, material processing and medical treatment. Theoretical calculations indicate that pulse mode peak power of COIL can be increased 770 times compared to continuous wave mode operation, which will have a significant thermal damaging effect on the target.
The magnetic gain switch is the best technology for realizing COIL pulse working mode, and the principle is that the transition of iodine atoms is controlled by the Zeeman effect generated by a magnetic field, so that the pulse output and the power amplification of laser are realized. However, the size of the magnetic field generated by the permanent magnet cannot be adjusted, and the electromagnetic coil is used for generating the magnetic field, and the circuit characteristics of the electromagnetic coil determine that the contradiction which cannot be solved exists between long-time maintenance and instantaneous drop of the magnetic field due to the fact that the circuit contains elements such as inductors, capacitors and the like, so that the drop time of the magnetic field and the laser pulse width of the existing electromagnetic coil system are both as high as tens of microseconds, the highest power gain is only about 55, and the use requirements cannot be completely met. Therefore, how to solve the problem of fast clearing after the magnetic field is maintained for a long time in a large space range is a main technical difficulty in realizing a high-performance magnetic gain switch.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a magnetic gain switch based on a flat-top pulse magnetic field and a method thereof, aiming at solving the technical problem of low power gain of the magnetic gain switch caused by the fact that the magnetic field cannot be rapidly cleared after being maintained for a long time in the prior art.
In order to achieve the above object, an aspect of the present invention provides a magnetic gain switch based on a flat-top pulse magnetic field, including a resonant cavity, a first permanent magnet, a second permanent magnet, a first electromagnetic coil and a second electromagnetic coil; the first permanent magnet and the second permanent magnet jointly generate a magnetic field in the resonant cavity, and the first electromagnetic coil and the second electromagnetic coil jointly generate a flat-top pulse magnetic field with the direction opposite to that of the constant magnetic field in the resonant cavity in the electrified state.
Preferably, two permanent magnets are oppositely disposed above and below the resonant cavity to generate a constant magnetic field in the resonant cavity, thereby maintaining the zeeman effect.
Preferably, the two electromagnetic coils are oppositely arranged and respectively positioned at the outer sides of the two permanent magnets, a flat-top pulse magnetic field opposite to the constant magnetic field of the permanent magnets is generated in the resonant cavity, the rising edge of the flat-top pulse magnetic field is extremely short, and the magnetic field can rapidly rise from zero to a peak value.
Preferably, the peak value of the flat-top pulse magnetic field generated by the electromagnetic coil is equal to the constant magnetic field generated by the permanent magnet in size, so that after the electromagnetic coil is electrified, the synthetic magnetic field in the resonant cavity can be rapidly reduced to zero, and the rapid clearing after the magnetic field is maintained for a long time is realized.
Preferably, the permanent magnet and the electromagnetic coil run completely independently, the duration of the constant magnetic field generated by the permanent magnet is determined by the time interval between two flat-top pulse magnetic fields, and the constant magnetic field can be flexibly adjusted in a large range.
Preferably, the electromagnetic coil does not operate while the permanent magnet maintains a constant magnetic field, heat generation of the electromagnetic coil is greatly reduced, and high repetition frequency pulse operation can be realized.
Preferably, the number of the permanent magnets can be selected and designed according to needs, can be one or more, can generate a constant magnetic field for maintaining the zeeman effect, and can be one or more of ferrite, neodymium iron boron, samarium cobalt and other reasonable types of permanent magnet materials.
Preferably, the number of the electromagnetic coils can be designed and selected according to needs, and can be one or more, so that the rising edge of the generated flat-top pulse magnetic field is ensured to be extremely short, and the peak value of the magnetic field can be opposite to the constant magnetic field generated by the permanent magnet in the same size.
The invention also provides a switching method based on the magnetic gain switch, which comprises the following steps: when the permanent magnet generates a constant magnetic field, the electromagnetic coil generates a flat-top pulse magnetic field with the direction opposite to that of the constant magnetic field in the electrified state, the rising edge of the flat-top pulse magnetic field is extremely short, the magnetic field is quickly zero after the magnetic fields are superposed, and the switching action is realized.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. according to the magnetic gain switch based on the flat-top pulse magnetic field, the permanent magnet generates a constant magnetic field without a power supply, the magnetic field requirement for maintaining the Zeeman effect is met, and the permanent magnet and the electromagnetic coil completely and independently operate, so that the duration of the constant magnetic field generated by the permanent magnet is determined by the time interval between two flat-top pulse magnetic fields, and the constant magnetic field can be flexibly adjusted in a large range.
2. According to the magnetic gain switch based on the flat-top pulse magnetic field, the rising edge of the flat-top pulse magnetic field is extremely short, the rising stage of the magnetic field is similar to a square wave, the magnetic field in the resonant cavity can be rapidly reduced and emptied, and the power gain of the magnetic gain switch can be greatly improved.
3. According to the magnetic gain switch based on the flat-top pulse magnetic field, the electromagnetic coil does not work at the stage that the permanent magnet maintains the constant magnetic field, so that the heat generated by the current in the electromagnetic coil is greatly reduced, the electromagnetic coil can work in a high repetition frequency pulse mode, and therefore the high repetition frequency work of the magnetic gain switch is achieved.
4. According to the magnetic gain switch based on the flat-top pulse magnetic field, the peak value of the magnetic field of the flat-top pulse magnetic field generated by the electromagnetic coil is in the same direction with the constant magnetic field generated by the permanent magnet, and the peak value is lower than the coercive force of the permanent magnet material, so that the permanent magnet cannot be demagnetized.
Drawings
Fig. 1 is a schematic structural diagram of a magnetic gain switch based on a flat-top pulse magnetic field according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a magnetic gain switch based on a flattop pulsed magnetic field according to an embodiment of the present invention;
fig. 3 is a diagram of waveforms of magnetic fields in a resonant cavity according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a magnetic gain switch based on a flat-top pulse magnetic field, which maintains the Zeeman effect through a constant magnetic field generated by a permanent magnet; and then the electromagnetic coil is used for generating a reverse flat-top pulse magnetic field to offset the constant magnetic field generated by the permanent magnet, so that the synthetic magnetic field in the resonant cavity is quickly emptied, and finally the purposes that the duration of the constant magnetic field is flexible and adjustable, the magnetic field can be quickly reduced and emptied after being maintained for a long time, the electromagnetic coil only works for a short time to reduce heating and the like are achieved, and the technical bottleneck of the magnetic gain switch is broken through.
Fig. 1 is a schematic structural diagram of a magnetic gain switch based on a flat-top pulse magnetic field according to an embodiment of the present invention, and in this embodiment, two permanent magnets and two electromagnetic coils are taken as an example for detailed description. Comprises a resonant cavity 1, permanent magnets 2-1 and 2-2 and electromagnetic coils 3-1 and 3-2; the permanent magnets 2-1 and 2-2 generate a constant magnetic field in the resonant cavity, and the electromagnetic coils 3-1 and 3-2 generate a flat-top pulse magnetic field in the resonant cavity.
Specifically, two permanent magnets are oppositely arranged and respectively positioned above and below the resonant cavity, and a constant magnetic field is generated in the resonant cavity, so that the Zeeman effect is maintained.
Specifically, the two electromagnetic coils are oppositely arranged and respectively positioned at the outer sides of the two permanent magnets, a flat-top pulse magnetic field opposite to the constant magnetic field of the permanent magnets is generated in the resonant cavity, the rising edge of the flat-top pulse magnetic field is extremely short, and the magnetic field can rapidly rise from zero to a peak value.
Specifically, the peak value of the flat-top pulse magnetic field generated by the electromagnetic coil is equal to the constant magnetic field generated by the permanent magnet in size, so that after the electromagnetic coil is electrified, the synthetic magnetic field in the resonant cavity can be rapidly reduced to zero, and the rapid removal after the magnetic field is maintained for a long time is realized.
Specifically, the permanent magnet and the electromagnetic coil run completely independently, the duration of the constant magnetic field generated by the permanent magnet is determined by the time interval between two flat-top pulse magnetic fields, and the constant magnetic field can be flexibly adjusted in a large range.
Specifically, the electromagnetic coil does not operate during the period when the permanent magnet maintains a constant magnetic field, the heat generation of the electromagnetic coil is greatly reduced, and high-repetition-frequency pulse operation can be realized.
Specifically, the number of the permanent magnets can be selected and designed according to needs, can be one or more, can generate a constant magnetic field for maintaining the zeeman effect, and can be one or more of ferrite, neodymium iron boron, samarium cobalt and other reasonable types of permanent magnet materials.
Specifically, the number of the electromagnetic coils can be designed and selected according to needs, and can be one or more, so that the rising edge of the generated flat-top pulse magnetic field can be ensured to be extremely short, and the peak value of the magnetic field can be opposite to the constant magnetic field generated by the permanent magnet in the same size.
Fig. 2 is a schematic cross-sectional structure diagram of a magnetic gain switch based on a flat-top pulsed magnetic field according to an embodiment of the present invention, in which a permanent magnet 2-1 and a permanent magnet 2-2 are respectively located above and below a resonant cavity 1, an electromagnetic coil 3-1 is located above the permanent magnet 2-1, and the electromagnetic coil 3-2 is located below the permanent magnet 2-2. FIG. 3 is a diagram of a magnetic field waveform in a resonant cavity, at t, according to an embodiment of the present invention1To t2In the stage, the electromagnetic coils 3-1 and 3-2 do not work, and the permanent magnets 2-1 and 2-2 generate upward constant magnetic fields B in the resonant cavity 11The Zeeman effect is maintained; at t2At the moment, the electromagnetic coils 3-1 and 3-2 discharge to generate a downward flat-top pulse magnetic field B2At this time, a magnetic field B is synthesized in the resonant cavity 13Is B2And B1And (3) superposition. If B is present2Peak value and B1Same, then at t3At the moment, the magnetic field B is synthesized in the resonant cavity 13Reduced to zero and held to t4The time of day. Permanent magnets 2-1, 2-2 and electromagnetic coils 3-1, 3-2 completely independently work, t1To t2In the stage, the electromagnetic coils 3-1 and 3-2 do not work, so that the heat generation of the electromagnetic coils 3-1 and 3-2 is greatly reduced, and the high repetition frequency pulse work is realized; and from t3To t4At time, the magnetic field B is synthesized3All the permanent magnets are kept to be zero, so that the demagnetization problem of the permanent magnets 2-1 and 2-2 is avoided; due to the rising edge t of the flat-top pulse magnetic field2To t3The time is extremely short, so that the resultant magnetic field B3The magnetic field in the resonant cavity 1 can be rapidly reduced to zero, the purpose of rapidly reducing and emptying the magnetic field in the resonant cavity is achieved, and the power gain of the magnetic gain switch is greatly improved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A magnetic gain switch based on a flat-top pulse magnetic field is characterized by comprising a resonant cavity, a first permanent magnet, a second permanent magnet, a first electromagnetic coil and a second electromagnetic coil; the first permanent magnet and the second permanent magnet are oppositely arranged and are respectively positioned at two sides of the resonant cavity, and the first electromagnetic coil and the second electromagnetic coil are oppositely arranged and are respectively positioned at the outer sides of the first permanent magnet and the second permanent magnet;
the first permanent magnet and the second permanent magnet jointly generate a constant magnetic field in the resonant cavity, and the first electromagnetic coil and the second electromagnetic coil are used for jointly generating a flat-top pulse magnetic field with the direction opposite to that of the constant magnetic field in the resonant cavity in an electrified state.
2. The magnetic gain switch of claim 1, wherein the rising edge of the flat-topped pulsed magnetic field is extremely short, the magnetic field can rapidly rise from zero to a peak, and the flat-topped pulsed magnetic field peak is equal in magnitude to the constant magnetic field.
3. The magnetic gain switch of claim 1, wherein the first and second electromagnetic coils are configured to maintain a constant magnetic field generated by the permanent magnet in a non-energized state.
4. A magnetic gain switch in accordance with claim 3, wherein the constant magnetic field is maintained for a time equal to the time interval between two flat-top pulsed magnetic fields.
5. The magnetic gain switch of claim 1, wherein the first and second permanent magnets may each be comprised of one or more permanent magnets and the first and second electromagnetic coils may each be comprised of one or more electromagnetic coils.
6. The magnetic gain switch of claim 5, wherein the material of the first and second permanent magnets is ferrite, neodymium-iron-boron, or samarium-cobalt.
7. A switching method based on the magnetic gain switch of any one of claims 1 to 6, comprising:
when the permanent magnet generates a constant magnetic field, the electromagnetic coil generates a flat-top pulse magnetic field in a direction opposite to the direction of the constant magnetic field in a power-on state, and the magnetic fields are superposed to realize zero magnetic field and realize switching action.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210049963.5A CN114512297B (en) | 2022-01-17 | 2022-01-17 | Magnetic gain switch and method based on flat-top pulse magnetic field |
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| CN202210049963.5A CN114512297B (en) | 2022-01-17 | 2022-01-17 | Magnetic gain switch and method based on flat-top pulse magnetic field |
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