CN111428371A - Rapid design method for periodic permanent magnet focusing system of traveling wave tube - Google Patents
Rapid design method for periodic permanent magnet focusing system of traveling wave tube Download PDFInfo
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Abstract
The invention belongs to the field of design of a traveling wave tube magnetic focusing system, and particularly relates to a rapid design method of a traveling wave tube periodic permanent magnetic focusing system. The invention adjusts the magnetic system according to the target system value distribution by using a parameterization mode: firstly, obtaining magnetic field distribution according with a target system value by two-dimensional calculation and adjustment; adjusting the opening magnetic steel to enable the magnetic field distribution obtained by integral three-dimensional calculation to be in accordance with a target system value; then obtaining the single ring value of each piece of magnetic steel according to the material parameters; finally, the technician can rapidly process the proper magnetic steel according to the single-ring value of each piece of magnetic steel.
Description
Technical Field
The invention belongs to the field of design of a traveling wave tube magnetic focusing system, and particularly relates to a rapid design method of a traveling wave tube periodic permanent magnetic focusing system.
Background
The periodic permanent magnet focusing system is an important component of the traveling wave tube and influences the emission, focusing and collection of electron beams. A set of excellent magnetic focusing system can ensure laminar flow property of electron beam, inhibit dynamic defocusing, and keep good state when the electron beam enters a collector, and the design of the system directly influences the performance of the whole tube.
The actual magnetic system is cumbersome and time consuming to design and manufacture. And there are many uncertainties associated with this process, including: repeated magnetization and demagnetization can change the performance of the magnetic steel and even scrap the magnetic steel; the magnetic field measurement is not fine by manual operation or the error of the measuring instrument possibly causes the deviation between the measured value and the actual value of the magnetic field to be too large; in the process of upper pipe debugging, the performance of the whole pipe is low due to assembly misalignment or large deviation of a magnetic system from a design value; in order to correct the electron beam, a technician can paste a lot of broken magnetic blocks around the magnetic steel by experience, but in doing so, the actual magnetic field distribution is greatly different from the magnetic field distribution required in the design.
When the electric vacuum device develops towards millimeter waves and even terahertz waves in a high-frequency band, the size of a magnetic system is smaller, the electron beam is thinner, the allowable error range is smaller, and the influence of uncertainty on the electron beam is more difficult to estimate.
Disclosure of Invention
Aiming at the problems or the defects, the invention provides a rapid design method of a periodic permanent magnet focusing system of a traveling wave tube.
A rapid design method for a traveling wave tube period permanent magnet focusing system is characterized in that an actual magnetic system is obtained by a target magnetic field system value of the traveling wave tube period permanent magnet focusing system, and the method comprises the following steps:
and S1, establishing a magnetic system model and a single magnetic ring model, and setting the coercive force parameter of each magnetic steel material as a variable.
And S2, simulating by using MFS, changing the coercive force parameter in S1, calculating a two-dimensional magnetic field, and circulating the process until the difference between the two-dimensional magnetic field calculation result and each peak value of a target system value is within 30 Gs.
And S3, increasing the coercive force variable of the open magnetic steel in the S2 until the difference between the three-dimensional calculation single-loop value and the two-dimensional calculation single-loop value of the open magnetic steel is within 1 Gs.
And S4, carrying out three-dimensional calculation verification on the whole magnetic field by using each coercivity parameter determined in S2 and S3:
and if the difference value of the three-dimensional magnetic field calculation result and each peak value of the target system value exceeds 50Gs, updating the target system value by using the difference value of the two-dimensional magnetic field calculation result and the three-dimensional magnetic field calculation result, and repeating S1-S3 until the difference value of the three-dimensional calculation result and each peak value of the target system value is within 50Gs, and finally determining each single magnetic steel parameter.
S5: and respectively substituting the parameters of the single magnetic steel determined in the step S4 to perform simulation calculation to obtain each single ring value.
S6: and magnetizing and demagnetizing the single magnetic steels according to the single ring values obtained in the step S5 to obtain an actual magnetic system.
Furthermore, the invention also provides a specific adjusting method of S2, by using the method, the adjusting speed of the two-dimensional magnetic field can be accelerated, and the two-dimensional magnetic field adjustment of a set of magnetic system can be completed within two hours. The method comprises the following specific steps:
the current system value of the non-special position is increased by x, the value range of x is 20-70Gs, the system value of the adjacent peak position is increased by 0.17-0.23x, the system value of the position which is separated from the adjacent peak position is reduced by 0.8-0.12x, and the influence of the farther position can be ignored; the system value change corresponding to the magnetic steel coercive force change is basically fixed, the coercive force change at a non-special position is 10000A/m, the coercive force change is 20-70Gs corresponding to the system value, and the influence of the coercive force change of different magnetic systems on the system value is different.
The opening position and the port position are special positions, the mutual influence between the magnetic steels is large, the current system value of the special position is increased by y, the value range of y is 20-70Gs, the system value of the adjacent peak position is increased by 0.2-0.5y, and the influence of the farther position can be ignored. The position of the port is insensitive to the change of the coercive force, the coercive force changes by 10000A/m and changes by 15-45Gs corresponding to a system value, and the coercive force changes of different magnetic systems have different influences on the system value. When the opening position magnetic steel is subjected to two-dimensional calculation, the magnetic steel is defaulted to be non-opening magnetic steel, the coercive force changes by 10000A/m, the coercive force changes by 20-70Gs corresponding to system values, and the influence of the coercive force changes of different magnetic systems on the system values is different.
The invention uses MFS software developed by the institute of computer simulation technology of electronic science and technology university to perform simulation design and optimization on a magnetic system. The magnetic system is adjusted using a parameterized approach according to the target system value distribution. Firstly, obtaining magnetic field distribution according with a target system value by two-dimensional calculation and adjustment; adjusting the opening magnetic steel to enable the magnetic field distribution obtained by integral three-dimensional calculation to be in accordance with a target system value; then obtaining the single ring value of each piece of magnetic steel according to the material parameters; finally, the technician can rapidly process the proper magnetic steel according to the single-ring value of each piece of magnetic steel. Since the whole magnetic system design process is based on the target system value, the magnetic field distribution of the magnetic system actually assembled by the magnetic steels should also conform to the target. In addition, in the design process of an electron gun, a beam injection interaction and a collector module, the given target system value is provided with redundancy, so that the magnetic system of the assembled upper tube can ensure the good state of the electron beam only by simple adjustment.
Drawings
FIG. 1 is a flow chart of a target magnetic field system value of a periodic permanent magnetic focusing system of a traveling wave tube to obtain an actual magnetic system;
FIG. 2 is a simulation model for implementing a routine wave tube PPM system;
FIG. 3 is a graph showing the distribution of the magnetic field Bz along the axis of a conventional wave tube;
FIG. 4 is a graph comparing the target requested system value and the measured system value after the routine wave tube is normalized.
Detailed Description
The technical scheme of the invention is explained in detail in the following by combining the drawings and the embodiment.
In this embodiment, for an actual traveling wave tube, a target system value of a magnetic field is obtained according to an electron gun, a wave injection interaction and a collector module design result, a rapid design method for obtaining an actual magnetic system from the target magnetic field system value of the periodic permanent magnet focusing system of the traveling wave tube is adopted, a single-ring value of each piece of magnetic steel is obtained, and a magnetic field distribution of the actual magnetic system matched according to the single-ring value is consistent with the target system value.
(1) A magnetic system model and a single magnetic ring model are established, and as shown in fig. 2, the magnetic system consists of 51 magnetic steels, 50 pole shoes and magnetic screens at two ends. And setting the coercive force of each magnetic steel material as a variable.
(2) And (4) performing simulation by using MFS, adjusting 51 coercive force parameters, calculating a two-dimensional magnetic field, and repeatedly adjusting until the difference between a two-dimensional calculation result and a target system value is within 30 Gs. The adjustment of the magnetic system follows the following rules: every time the system value of the non-port position is increased by 20Gs, the system values of two magnetic steel positions adjacent to the non-port position are increased by 3Gs, and the system value of a magnetic steel position which is separated from the non-port position is reduced by 1 Gs; the coercive force of the non-port position changes by 10000A/m, and the system value of the corresponding position changes by 50 Gs; the coercivity of the port position changes by 10000A/m and the system value changes by 31 Gs.
(3) And (4) increasing the coercive force variable of the two pieces of open magnetic steel until the three-dimensional calculation single-loop value and the two-dimensional calculation single-loop value of the open magnetic steel are equal.
(4) The whole magnetic field is three-dimensionally calculated, and the distribution curve of the axis magnetic field Bz in the calculation result is shown in fig. 3. And (4) obtaining the peak value of each magnetic field system value by utilizing an MTSS software post-processing tool, wherein the difference value between the target required system value and the three-dimensional magnetic field simulation system value is less than 50 Gs. At the moment, the parameters of each magnetic steel are determined.
(5) And respectively carrying out simulation calculation by introducing the determined parameters of the single magnetic steel to obtain the single-ring value of each piece of magnetic steel.
(6) And (3) according to the single-ring value, magnetizing and demagnetizing each single magnetic steel, matching an actual magnetic system, and comparing a target system value with an actual measurement system value as shown in fig. 4. The difference of the rest positions is controlled within 50Gs except that the difference of the individual positions is 80Gs-100 Gs. The actual magnetic system conforms to the target.
In summary, the present invention provides a fast design method for obtaining an actual magnetic system from a target magnetic field system value, taking a periodic permanent magnetic focusing system of a traveling wave tube as an example. The magnetic system matched by the technical personnel according to the method meets the design requirement, and the actual requirement can be met only by simple adjustment after assembly.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (2)
1. A rapid design method for a periodic permanent magnet focusing system of a traveling wave tube comprises the following steps:
s1, establishing a magnetic system model and a single magnetic ring model, and setting the coercive force parameter of each magnetic steel material as a variable;
s2, using MFS to simulate, changing the coercive force parameter in S1 and calculating a two-dimensional magnetic field, and circulating the process until the difference between the two-dimensional magnetic field calculation result and each peak value of a target system value is within 30 Gs;
s3, increasing the coercive force variable of the open magnetic steel in the S2 until the difference value between the three-dimensional calculation single-ring value and the two-dimensional calculation single-ring value of the open magnetic steel is within 1 Gs;
s4, carrying out three-dimensional calculation verification on the whole magnetic field by using each coercivity parameter determined in S2 and S3;
if the difference value of the three-dimensional magnetic field calculation result and each peak value of the target system value exceeds 50Gs, updating the target system value by using the difference value of the two-dimensional magnetic field calculation result and the three-dimensional magnetic field calculation result, and repeating S1-S3 until the difference value of the three-dimensional calculation result and each peak value of the target system value is within 50Gs, and finally determining each single magnetic steel parameter at this moment;
s5: respectively substituting the parameters of the single magnetic steel determined in the S4 to perform simulation calculation to obtain each single ring value;
s6: and magnetizing and demagnetizing the single magnetic steels according to the single ring values obtained in the step S5 to obtain an actual magnetic system.
2. The fast design method of the traveling wave tube periodic permanent magnet focusing system according to claim 1, characterized in that:
the specific adjusting method in the step 2 comprises the following steps:
the current system value of the unspecified position is increased by x, the value range of x is 20-70Gs, the system value of the adjacent peak position is increased by 0.17-0.23x, and the system value of the position which is separated from the adjacent peak position is reduced by 0.8-0.12 x; the coercive force at a non-special position is changed by 10000A/m, and the corresponding system value is changed by 20-70 Gs;
the opening position and the port position are special positions, the current system value of the special position is increased by y, the value range of y is 20-70Gs, and the system value of the adjacent peak value position is increased by 0.2-0.5 y; the coercive force of the port position changes by 10000A/m, and changes by 15-45Gs corresponding to the system value; when the opening position magnetic steel is subjected to two-dimensional calculation, the magnetic steel is defaulted to be non-opening magnetic steel, the coercive force changes by 10000A/m, the coercive force changes by 20-70Gs corresponding to system values, and the influence of the coercive force changes of different magnetic systems on the system values is different.
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Cited By (3)
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| CN112214847A (en) * | 2020-09-18 | 2021-01-12 | 电子科技大学 | Design method of periodic permanent magnet focusing system of traveling wave tube |
| CN112287512A (en) * | 2020-09-03 | 2021-01-29 | 电子科技大学 | Design method of periodic permanent magnet focusing system associated with 1/4 periodic actual axial magnetic field |
| CN113158432A (en) * | 2021-03-25 | 2021-07-23 | 潍柴动力股份有限公司 | Stress and strain-containing JA hysteresis model parameter identification method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112214847B (en) * | 2020-09-18 | 2022-03-15 | 电子科技大学 | Design method of periodic permanent magnet focusing system of traveling wave tube |
| CN113158432A (en) * | 2021-03-25 | 2021-07-23 | 潍柴动力股份有限公司 | Stress and strain-containing JA hysteresis model parameter identification method |
| CN113158432B (en) * | 2021-03-25 | 2023-03-21 | 潍柴动力股份有限公司 | Stress and strain-containing JA hysteresis model parameter identification method |
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