A measuring device for low frequency beam coupling impedance

Abstract

The utility model discloses a kind of measuring devices of low-frequency beam transverse coupling impedance, including vacuum box;Guide plate, install in the inside of the vacuum box, for guiding excitation signal through measurement area;Coil, as the transmission path of excitation signal;Sealing flange and positioning and precision regulator, cooperate to guarantee the positioning accuracy of the coil and guide plate, so that it is always located in the center of vacuum box;Connector;Power separation / synthesizer, install in measurement component and flange outside, for the test signal sent by vector network analyzer is divided into difference mode two-way signal and is fed into measuring coil;Adapter, for adjusting the interface of signal, to adapt to different measuring instrument;Cable and cable, respectively connect measurement component port, power separation / synthesizer and vector network analyzer.The utility model realizes the significant improvement of measurement accuracy by optimizing the number of turns layout of coil and accurately controlling precision.

Description

Technical Field

[0001] This invention belongs to the field of transverse coupling impedance measurement technology, and in particular to a device for measuring the transverse coupling impedance of a low-frequency beam. Background Technology

[0002] Accurate measurement of lateral coupling impedance is a crucial step in evaluating the design integrity of vacuum components in high-current accelerators. Currently, the industry-standard pulsed two-wire method involves inserting a pair of parallel transmission lines into the component under test and applying a reverse excitation signal. A vector network analyzer is then used to measure frequency domain reflection and transmission parameters, and the lateral impedance value is calculated using a transmission line model. This method has become the mainstream standardized testing approach due to its wide bandwidth coverage (theoretically supporting the DC to GHz band) and ease of operation.

[0003] However, when the measurement frequency drops below 10MHz, the limitations of this method become apparent: at extremely low frequencies, the signal wavelength increases significantly, leading to a sharp decrease in the electromagnetic coupling efficiency between the two lines. The transmitted signal amplitude is completely covered by the instrument's background noise, making it impossible to obtain an effective signal. Furthermore, the skin effect weakens at low frequencies, the current distribution becomes more uniform, and the field distribution assumed by the traditional transmission line model fails, making it impossible to interpret the calculation results and causing a significant deviation from actual characteristics. Moreover, the high characteristic impedance of the two-line structure and its impedance mismatch with the vector network analyzer result in a small coupled signal, further complicating the measurement. Utility Model Content

[0004] The purpose of this invention is to provide a measuring device for the lateral coupling impedance of a low-frequency beam, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a measuring device for the lateral coupling impedance of a low-frequency beam, comprising:

[0006] A vacuum chamber is used to maintain the vacuum environment required for beam operation.

[0007] A guide plate, installed inside the vacuum chamber, is used to guide the excitation signal through the measurement area;

[0008] A coil, wrapped around the guide plate, serves as the transmission path for the excitation signal;

[0009] The sealing flange and positioning and precision adjuster work together to ensure the positioning accuracy of the coil and guide plate, so that they are always located at the center of the vacuum box;

[0010] Connectors are used to integrate measuring devices with coils, serving as input and output interfaces for the core measurement area;

[0011] The power splitter / combiner, mounted outside the measuring component and flange, is used to split the test signal from the vector network analyzer into differential mode signals and feed them into the measuring coil.

[0012] In a preferred embodiment, the device further includes:

[0013] Adapters are used to adjust the signal interface to adapt to different measuring instruments;

[0014] The first cable and the second cable are respectively connected to the measurement component port, the power splitter / combiner, and the vector network analyzer.

[0015] In a preferred embodiment, the device further includes a vector network analyzer, which is responsible for sending test signals and receiving reflected signals, thereby calculating the transverse coupling impedance of the beam.

[0016] In this preferred embodiment, the position of the coil is controlled by a sealing flange and is designed with a precision adjustment device, which can accurately control the position of the coil and the measuring component.

[0017] In a preferred embodiment of this design, the guide plate has guide slots for the coil, used to arrange the number of coil turns and the position between turns.

[0018] In this preferred embodiment, the measuring device uses a magnetic coupling coil to concentrate low-frequency magnetic field energy to improve transmission efficiency and can combine a shielded cavity with a differential measurement structure to suppress environmental noise interference.

[0019] Compared with the prior art, the technical effects and advantages of this utility model are as follows:

[0020] This low-frequency beam lateral coupling impedance measurement device, through the precise installation of the guide plate, enables the excitation signal to be efficiently guided through the measurement area, achieving optimized signal path control and improving signal strength and clarity. The guide plate's role is to guide the excitation signal accurately through the measurement area, ensuring the coil receives the purest signal. This design reduces energy loss or interference caused by signal path deviations, enhancing the accuracy of subsequent calculations.

[0021] By using a coil wound around the guide plate, the main transmission path of the excitation signal achieves high concentration and stability, effectively concentrating magnetic field energy and improving the transmission efficiency of low-frequency signals. The coil design not only optimizes the signal transmission path but also concentrates magnetic field energy through its physical layout. Particularly in the low-frequency range, this design effectively overcomes the problem of decreased electromagnetic coupling efficiency caused by the increase in signal wavelength in the traditional pulsed two-wire method. This directly improves the performance of the measuring device in the low-frequency range.

[0022] By using a sealing flange in conjunction with a positioning and precision adjuster, the positions of the coil and guide plate can be precisely controlled, achieving flexibility and accuracy in position adjustment and enhancing measurement repeatability and consistency. The sealing flange not only ensures the integrity of the vacuum environment but also allows for fine-tuning of the coil's position via its precision adjustment device. This precise control ensures the coil is in the optimal position for each measurement, greatly improving the consistency and repeatability of measurement results, which is particularly important for scientific research and engineering applications. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Fig. 1 This is a schematic diagram of a low-frequency beam transverse coupling impedance measuring device according to the present invention.

[0025] Fig. 2 This is the assembly drawing of the core area of ​​the measuring component of this utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] In the diagram: 1. Vacuum box; 2. Guide plate; 3. Coil; 4. Sealing flange; 5. Positioning and precision adjuster; 6. Connector; 7. Power splitter / synthesizer; 8. Adapter; 9. Cable; 10. Vector network analyzer; 11. Cable. Detailed Implementation

[0028] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0029] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0030] This embodiment provides, for example Figs. 1-2 The device shown is for measuring the lateral coupling impedance of a low-frequency beam, comprising:

[0031] Vacuum box 1 is used to maintain the vacuum environment required for beam operation;

[0032] Guide plate 2, installed inside vacuum box 1, is used to guide the excitation signal through the measurement area;

[0033] Coil 3, which is wrapped around guide plate 2, serves as the transmission path for excitation signal;

[0034] The sealing flange 4 and the positioning and precision adjuster 5 work together to ensure the positioning accuracy of the coil 3 and the guide plate 2, so that they are always located at the center of the vacuum box;

[0035] Connector 6 is used to integrate the measuring device and coil, serving as the input and output interface for the core measuring area;

[0036] The power splitter / combiner 7, mounted outside the measuring component and flange, is used to split the test signal from the vector network analyzer into differential mode signals and feed them into the measuring coil.

[0037] In this embodiment, the device further includes:

[0038] Adapter 8 is used to adjust the signal interface to adapt to different measuring instruments;

[0039] Cables 9 and 11 are respectively connected to the measurement component port, the power splitter / combiner 7, and the vector network analyzer 10.

[0040] In this embodiment, the device also includes a vector network analyzer 10, which is responsible for sending test signals and receiving reflected signals, and then calculating the transverse coupling impedance of the beam.

[0041] In this embodiment, the position of coil 3 is controlled by a sealing flange and is designed with a precision adjustment device, which can accurately control the position of the coil and the measuring component.

[0042] In this embodiment, the guide plate 2 has a guide slot for the coil, which is used to arrange the number of coil turns and the position between turns.

[0043] In this embodiment, the measuring device uses a magnetic coupling coil to concentrate low-frequency magnetic field energy to improve transmission efficiency and can combine a shielded cavity with a differential measurement structure to suppress environmental noise interference.

[0044] Working principle:

[0045] The low-frequency beam transverse coupling impedance measurement device maintains a suitable vacuum environment inside the vacuum box 1, which is the basic condition for beam operation. The guide plate 2 is installed inside the vacuum box 1, and the coil 3 is precisely arranged. The accurate position is ensured by the sealing flange 4 and the positioning and accuracy adjuster 5. The vector network analyzer 10 generates test signals and sends them to the power splitter / combiner 7 through the cable 11. The power splitter / combiner 7 splits the received test signals into differential mode signals to adapt to different measurement requirements.

[0046] The differential signal, after being divided, enters the coil 3 inside the vacuum box 1 through the connector 6. As an excitation signal guide plate 2, it helps the signal pass through the measurement area correctly. The high permeability coil concentrates the low-frequency magnetic field energy to improve transmission efficiency. The shielded cavity design and differential measurement structure are used to suppress environmental noise interference and ensure the purity of the signal.

[0047] The reflected signal generated by the excitation signal after passing through the measurement area is returned to the power splitter / combiner 7 through connector 6, and finally transmitted back to the vector network analyzer 10. The vector network analyzer 10 receives the reflected signal and calculates the transverse coupling impedance value of the beam based on the pre-built broadband simulation model.

[0048] The design integrity of the component under test is assessed based on the calculated transverse coupling impedance value. If more accurate results are required or for different configurations (single-turn or multi-turn coils), the impedance measurement parameters in the horizontal and vertical directions can be quickly adjusted by changing the flange. The above process is repeated until satisfactory measurement accuracy is obtained.

[0049] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the lateral coupling impedance of a low-frequency beam, characterized in that, include: Vacuum box (1) is used to maintain the vacuum environment required for beam operation; A guide plate (2) is installed inside the vacuum box (1) to guide the excitation signal through the measurement area; A coil (3) is wrapped around the guide plate (2) as a transmission path for the excitation signal; The sealing flange (4) and the positioning and accuracy adjuster (5) work together to ensure the positioning accuracy of the coil (3) and the guide plate (2) so that they are always located in the center of the vacuum box; Connector (6) is used to integrate the measuring device and the coil, serving as the input and output interface for the core measuring area; The power splitter / synthesizer (7), installed outside the measuring component and flange, is used to split the test signal from the vector network analyzer into two differential signals and feed them into the measuring coil.

2. The measuring device for low-frequency beam lateral coupling impedance according to claim 1, characterized in that: The device further includes: Adapter (8) is used to adjust the signal interface to adapt to different measuring instruments; The first cable (9) and the second cable (11) are respectively connected to the measurement component port, the power splitter / combiner (7) and the vector network analyzer (10).

3. The measuring device for low-frequency beam lateral coupling impedance according to claim 1, characterized in that: The device also includes a vector network analyzer (10), which is responsible for sending test signals and receiving reflected signals, and then calculating the transverse coupling impedance of the beam.

4. The measuring device for low-frequency beam lateral coupling impedance according to claim 3, characterized in that: The position of the coil (3) is controlled by a sealing flange and is designed with a precision adjustment device, which can accurately control the position of the coil and the measuring component.

5. The measuring device for low-frequency beam lateral coupling impedance according to claim 4, characterized in that: The guide plate (2) has a guide slot for the coil, which is used to arrange the number of coil turns and the position between turns.

6. The measuring device for low-frequency beam lateral coupling impedance according to claim 5, characterized in that: The measuring device uses a magnetic coupling coil to concentrate low-frequency magnetic field energy to improve transmission efficiency and can combine a shielded cavity with a differential measurement structure to suppress environmental noise interference.

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