Broadband radio frequency voltage sampling device based on magnetic alloy material

Abstract

The invention relates to the technical field of synchronous particle accelerators, and provides a broadband radio-frequency voltage sampling device based on a magnetic alloy material, and the device comprises a capacitance voltage division circuit, one end of which is used for connecting a radio-frequency high-voltage end; the multiple is used for adjusting the sampling ratio; one end of the broadband impedance converter is connected with the other end of the capacitance voltage division circuit; the broadband impedance transformer comprises a first magnetic alloy ring and a first multi-core twisted wire; and the radio frequency N-type connector is connected with the other end of the broadband impedance converter, and the radio frequency N-type connector is a voltage sampling output port. According to the broadband radio frequency voltage sampling device based on the magnetic alloy material provided by the invention, the first magnetic alloy ring has very high magnetic conductivity and has a relatively low quality factor Q value, so that the broadband radio frequency voltage sampling device has an excellent broadband, and the low-frequency band characteristic of the impedance conversion circuit is greatly improved; the problem of broadband of a radio frequency voltage sampling circuit and the problem of poor performance of a low frequency band are well solved.

Description

Technical Field

[0001] The present invention relates to the technical field of synchronous particle accelerators, and in particular to a broadband radio frequency voltage sampling device based on magnetic alloy materials. Background Art

[0002] Synchronous particle accelerators have the characteristics of synchronous fast cycling, high current and high energy. The synchronous accelerator requires the extracted beam current to have the characteristics of high current intensity, high energy, high quality, etc. Therefore, synchronous particle accelerators have put forward ultra-high technical index requirements such as broadband, high voltage, and multi-harmonic acceleration for their high-frequency systems. Under this requirement, the high-frequency system needs to realize functions such as capturing, accelerating, and multi-harmonic accelerating of particle beams. The radio frequency cavity needs to complete operations such as capturing, frequency conversion fundamental wave acceleration, and point frequency multi-harmonic acceleration within one working cycle. This requires the cavity to have an ultra-wide working bandwidth to take into account all frequency points included in the fundamental wave and harmonics, and needs to meet two working modes of frequency conversion and point frequency.

[0003] In addition, during the process of particle beam capture and multi-harmonic voltage acceleration, the radio frequency cavity needs to generate and output a relatively small radio frequency voltage, and the minimum value of the radio frequency peak voltage is less than 100V. However, during the process of particle beam frequency conversion fundamental wave mode acceleration, the radio frequency cavity needs to output a very high radio frequency voltage, and the maximum peak voltage exceeds 70kV.

[0004] Especially for all-ion synchronous accelerators of types such as protons and heavy ions, due to the large variety of particle working types and the large difference in charge-to-mass ratios, when the working frequency band covers the operation requirements of the entire particle beam, the frequency range has a large span, usually between 0.1 MHz and 10 MHz.

[0005] Therefore, how to provide a radio frequency voltage sampling device that can output a low voltage with high precision under high voltage and meet performance parameters such as sampling flatness within the above low-frequency band range is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] The present invention provides a broadband radio frequency voltage sampling device based on magnetic alloy materials to solve at least one of the above technical problems.

[0007] The present invention provides a broadband radio frequency voltage sampling device based on magnetic alloy materials, including: A capacitive voltage division circuit, one end of which is used to connect to the radio frequency high voltage end; the capacitive voltage division circuit is used to adjust the multiple of the sampling ratio; A broadband impedance converter, one end of which is connected to the other end of the capacitive voltage division circuit; and the broadband impedance converter includes a first magnetic alloy ring and a first multi-core twisted wire, and the first multi-core twisted wire is wound around the outer periphery of the first magnetic alloy ring; An RF N-type connector is connected to the other end of the broadband impedance transformer, and the RF N-type connector is a voltage sampling output port.

[0008] A broadband RF voltage sampling device based on a magnetic alloy material according to the present invention further includes: a broadband power divider connected to one end of the broadband impedance transformer facing away from the capacitive voltage dividing circuit. The broadband power divider includes a second magnetic alloy ring and a second multi-core twisted wire, and the second multi-core twisted wire is wound around the second magnetic alloy ring. The RF N-type connector includes two paths, and both paths of the RF N-type connector are connected to the broadband power divider.

[0009] In a broadband RF voltage sampling device based on a magnetic alloy material according to the present invention, both the first magnetic alloy ring and the second magnetic alloy ring are wound into a ring shape by a nanocrystalline magnetic alloy strip, and the surface of the nanocrystalline magnetic alloy strip is coated with a silica insulating coating.

[0010] In a broadband RF voltage sampling device based on a magnetic alloy material according to the present invention, a packaging layer is provided on the surfaces of the first magnetic alloy ring and the second magnetic alloy ring. In a broadband impedance transformer of a broadband RF voltage sampling device based on a magnetic alloy material according to the present invention, the nanocrystalline magnetic alloy strip is wound around the outer periphery of the nanocrystalline magnetic alloy ring body 10 turns by a multi-core twisted wire, and the impedance transformation ratio of the broadband impedance transformer is 1:9.

[0011] In a broadband power divider of a broadband RF voltage sampling device based on a magnetic alloy material according to the present invention, the nanocrystalline magnetic alloy strip is wound around the outer periphery of the nanocrystalline magnetic alloy ring body 10 turns by a multi-core twisted wire, and the voltage ratio between the input port and any output port of the broadband power divider is 2:1.

[0012] A broadband RF voltage sampling device based on a magnetic alloy material according to the present invention, the capacitive voltage dividing circuit includes: A small capacitance high-voltage capacitor for connecting to the RF high-voltage end; A large capacitance low-voltage capacitor, one end of which is connected to the small capacitance high-voltage capacitor, and the other end is connected to the broadband impedance transformer; and the large capacitance low-voltage capacitor is grounded.

[0013] A broadband RF voltage sampling device based on a magnetic alloy material according to the present invention, the capacitive voltage dividing circuit includes two parallel paths, and each path of the capacitive voltage dividing circuit is connected to the broadband impedance transformer.

[0014] A broadband radio frequency voltage sampling device based on a magnetic alloy material provided by the present invention. The small-capacitance high-voltage capacitor is composed of two 30 pF high-voltage vacuum capacitors connected in parallel. The withstand voltage of a single vacuum capacitor is greater than 20 kV, and the maximum current it can withstand is 12 A.

[0015] A broadband radio frequency voltage sampling device based on a magnetic alloy material provided by the present invention. The thickness of the nanocrystalline magnetic alloy strip is 13 - 18 microns.

[0016] The broadband radio frequency voltage sampling device based on a magnetic alloy material provided by the present invention. One end of a capacitive voltage division circuit is connected to the radio frequency high-voltage end. The capacitive voltage division circuit adjusts the multiple of the sampling ratio. One end of a broadband impedance converter is connected to the other end of the capacitive voltage division circuit. The broadband impedance converter includes a first magnetic alloy ring and a first multi-core stranded wire. The first multi-core stranded wire is wound around the outer periphery of the first magnetic alloy ring. The radio frequency N-type connector is connected to the other end of the broadband impedance converter. The radio frequency N-type connector is the voltage sampling output port. Since the first magnetic alloy ring has a very high magnetic permeability and a low quality factor Q value, it has excellent broadband characteristics and greatly improves the characteristics of the impedance transformation circuit in the low-frequency band. Using a magnetic alloy ring with such a high magnetic permeability and a low quality factor Q value in the broadband impedance converter well solves the broadband problem of the radio frequency voltage sampling circuit and the problem of poor performance in the low-frequency band. Especially in the low-frequency band (0.1 - 0.5 MHz) used in the operating frequency of heavy ion accelerators, it has better broadband characteristics, can further improve performance parameters such as the sampling flatness of the sampling device in the low-frequency band range, and can be applied to all-particle synchrotrons of various types of protons and heavy ions.

[0017] In addition, by adjusting the multiple of the sampling ratio of the sampling device through the capacitive voltage division circuit and combining with the voltage division ratio of the broadband impedance converter, the design requirement of a sampling ratio of more than 14,000 times for the radio frequency voltage sampling device is jointly achieved.

[0018] The broadband power divider is connected to the capacitive voltage division circuit, and the broadband power divider is a magnetic alloy ring. Since the second magnetic alloy ring has high performance, high magnetic permeability and a low quality factor Q value, it solves the problem of broadband power distribution. At the same time, the fabricated broadband power distribution circuit realizes the design requirement of two high-precision wide-port outputs of the radio frequency voltage sampling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is a schematic diagram of the composition of the broadband radio frequency voltage sampling device based on magnetic alloy materials provided by the present invention.

[0021] Figure 2 It is an overall structure diagram of the broadband radio frequency voltage sampling device based on magnetic alloy materials provided by the present invention.

[0022] Figure 3 It is a structure diagram of the first magnetic alloy ring or the second magnetic alloy ring provided by the present invention.

[0023] Figure 4 It is a cross-sectional view of the first magnetic alloy ring or the second magnetic alloy ring provided by the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the broadband impedance converter provided by the present invention.

[0025] Figure 6 It is a schematic diagram of the structure of the broadband power divider provided by the present invention.

[0026] Figure 7 It is a schematic diagram of the structure of the small-capacitance high-voltage capacitor provided by the present invention.

[0027] Figure 8 It is a schematic diagram of the structure of the radio frequency N-type connector provided by the present invention.

[0028] Reference numerals: 1. Capacitive voltage division circuit; 2. Broadband impedance converter; 3. Radio frequency N-type connector; 4. Broadband power divider; 11. Small-capacitance high-voltage capacitor; 12. Large-capacitance low-voltage capacitor; 21. First magnetic alloy ring; 211. Nanocrystalline magnetic alloy strip; 212. Encapsulation layer; 22. First multi-core winding wire; 41. Second magnetic alloy ring; 42. Second multi-core winding wire. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention fall within the scope of protection of the present invention.

[0030] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] The following will describe the broadband radio frequency voltage sampling device of the magnetic alloy material of the present invention in conjunction with Figures 1-8 Describe the broadband radio frequency voltage sampling device of the magnetic alloy material of the present invention.

[0032] As Figures 1-5 shown, the embodiments of the present invention provide a broadband radio frequency voltage sampling device based on a magnetic alloy material, which is used in the high-frequency cavity of an ion accelerator and includes a capacitive voltage division circuit 1, a broadband impedance converter 2, and a radio frequency N-type connector 3. One end of the capacitive voltage division circuit 1 is used to connect to the radio frequency high-voltage end, and the capacitive voltage division circuit 1 is used to adjust the multiple of the sampling ratio. Through the capacitive voltage division circuit 1, a proportionally reduced voltage value can be safely obtained for subsequent measurement and processing.

[0033] One end of the broadband impedance converter 2 is connected to the other end of the capacitive voltage division circuit 1; and the broadband impedance converter 2 includes a first magnetic alloy ring 21 and a first multi-core stranded wire 22, and the first multi-core stranded wire 22 is wound around the outer circumference of the first magnetic alloy ring 21. The radio frequency N-type connector 3 is connected to the other end of the broadband impedance converter 2, and the radio frequency N-type connector 3 is a voltage sampling output port.

[0034] Among them, the first magnetic alloy ring 21 has a very high magnetic permeability and can effectively guide magnetic field lines, thereby enhancing the coupling effect of the electromagnetic field. The first magnetic alloy ring 21 has a relatively low quality factor Q value (less than 1), which is beneficial to broadening the working frequency range. In addition, the impedance value of the first magnetic alloy ring 21 is relatively constant throughout the frequency band and is little affected by the working temperature and magnetic induction intensity. The first magnetic alloy ring 21 has a high saturation magnetic flux density (≥1T), and the power consumption capacity per unit volume is relatively high. In addition, the first magnetic alloy ring 21 has a relatively high Curie temperature (greater than 500 °C), so the performance change is small due to temperature influence.

[0035] Therefore, the broadband impedance converter 2 has excellent broadband characteristics and can perform well in the low-frequency band. The use of a magnetic alloy ring with high magnetic permeability and low Q value well solves the problems of the broadband and low-frequency band performance of the radio frequency voltage sampling device. The broadband impedance converter 2 made of a magnetic alloy ring can be better used in heavy ion accelerators (the operating frequency is usually 0.1 - 6 MHz), especially in the low-frequency band (0.1 - 0.5 MHz), with more excellent broadband performance, and can further improve performance parameters such as the sampling flatness of the sampling device in the low-frequency band range.

[0036] The RF N-type connector 3 is a standard RF connector with excellent electrical performance and mechanical stability, suitable for the transmission of high-frequency and high-power RF signals. The RF N-type connector 3 outputs the voltage signal after capacitance voltage division and impedance transformation to an external measurement device or system.

[0037] In addition, by adjusting the multiple of the sampling ratio of the sampling device through the capacitance voltage division circuit 1 and combining with the voltage division ratio of the broadband impedance converter 2, the requirement of the sampling ratio of the radio frequency voltage sampling device exceeding 14,000 times is jointly achieved, and it can effectively sample and measure extremely high radio frequency voltages while maintaining high precision.

[0038] As Figures 1-6 shown, in a feasible embodiment of the present invention, it further includes a broadband power divider 4, which is connected to one end of the broadband impedance converter 2 facing away from the capacitance voltage division circuit 1. After the radio frequency signal undergoes voltage sampling through the capacitance voltage division circuit 1, it will first enter the broadband impedance converter 2 for impedance matching and frequency response optimization, and then enter the broadband power divider 4. The broadband power divider 4 includes a second magnetic alloy ring 41 and a second multi-core twisted wire 42, and the second multi-core twisted wire 42 is wound around the second magnetic alloy ring 41. The characteristics of high magnetic permeability and low quality factor Q value of the second magnetic alloy ring 41 help to broaden the operating frequency range of the power divider and maintain good performance in the low-frequency band.

[0039] The RF N-type connector 3 includes two paths, and both paths of the RF N-type connector 3 are connected to the broadband power divider 4. Among them, the broadband power divider 4 includes a second magnetic alloy ring 41 and a second multi-core twisted wire 42, and the second multi-core twisted wire 42 is wound around the outer periphery of the second magnetic alloy ring 41. The second magnetic alloy ring 41 has high performance, high magnetic permeability, and low Q value, successfully solving the problem of broadband power distribution. At the same time, by using the made broadband power divider 4, the requirement of two high-precision port outputs of the radio frequency voltage sampling device is achieved. Both RF N-type connectors 3 are 50Ω. The function of the broadband power divider 4 is to evenly and non-interferingly distribute the input radio frequency signal power to these two output ports. In this way, the radio frequency signals on the two output ports will have the same amplitude and phase, but the power is evenly divided.

[0040] The working principle of the embodiment of the present invention is as follows: The high-voltage end of the radio frequency samples the voltage through the capacitive voltage dividing circuit 1 to obtain a voltage signal reduced in proportion. The voltage signal passes through the broadband impedance converter 2 for impedance matching and frequency response optimization to adapt to the radio frequency signal transmission within a wide frequency band. The optimized radio frequency signal enters the broadband power divider 4 and is evenly distributed to the two radio frequency N-type connectors 3. The two radio frequency N-type connectors 3 respectively provide radio frequency signal sampling outputs to external devices or systems.

[0041] It should be noted that when the synchrotron high-frequency cavity is operating normally, two high-precision voltage sampling signals need to be output from the cavity simultaneously. One sampling signal is used for the amplitude and phase stability control of the cavity; the other sampling signal is used for the monitoring of the cavity voltage waveform. Therefore, two high-precision voltage sampling signals can be output simultaneously through the above embodiments.

[0042] In addition, through the settings of the broadband impedance converter 2 and the broadband power divider 4, the radio frequency voltage sampling device has extremely small radio frequency voltage amplitude errors within the entire working frequency band range in one voltage cycle, and can meet the requirements of high-precision voltage sampling.

[0043] In a feasible embodiment of the present invention, both the first magnetic alloy ring 21 and the second magnetic alloy ring 41 are wound into rings by nanocrystalline magnetic alloy strips 211, which is convenient for connecting with surrounding circuit elements and also provides a stable support structure for subsequent winding. Nanocrystalline magnetic alloy is a high-performance soft magnetic material with excellent characteristics such as high magnetic permeability and low loss. These characteristics enable the magnetic alloy ring to maintain stable performance in broadband applications and effectively reduce signal distortion and loss.

[0044] The magnetic alloy ring adopts the transmission line transformer technology and successfully solves the problem of broadband power distribution. By adjusting the winding parameters of the nanocrystalline magnetic alloy strip 211, such as the number of turns and winding density, the electromagnetic performance of the first magnetic alloy ring 21 and the second magnetic alloy ring 41 can be further optimized.

[0045] In a feasible embodiment of the present invention, encapsulation layers 212 are provided on the surfaces of the first magnetic alloy ring 21 and the second magnetic alloy ring 41. The encapsulation layers 212 can protect the first magnetic alloy ring 21 and the second magnetic alloy ring 41 from being eroded by the external environment. The encapsulation layers 212 should have good insulation performance and mechanical strength. Common encapsulation materials include polymer materials such as epoxy resin and polyimide. A silica insulation coating is coated on the surface of the nanocrystalline magnetic alloy strip 211. The silica insulation coating can provide electrical insulation to prevent short circuits between the nanocrystalline magnetic alloy strips 211 or between the nanocrystalline magnetic alloy strips 211 and the external circuit. At the same time, the silica insulation coating can also reduce electromagnetic interference to a certain extent and improve the electromagnetic compatibility of the magnetic alloy ring.

[0046] Among them, the manufacturing process of the first magnetic alloy ring 21 and the second magnetic alloy ring 41: It is made by winding the 14-μm ultra-thin nanocrystalline magnetic alloy strip 211 with a 1-μm-thick silica insulation coating on the surface, and then through high-temperature heat treatment and surface encapsulation. The size of the magnetic alloy ring (outer diameter * inner diameter * thickness) is: φ24×φ12×10 mm; the key performance parameters of the magnetic alloy ring 3: the magnetic permeability at 0.3 MHz is 20,000, and the Q value at 0.3 MHz is 0.9.

[0047] In a feasible embodiment of the present invention, in the broadband impedance converter 2, the broadband characteristics are determined by the loaded magnetic core. Therefore, the performance of the magnetic core and the number of turns of the winding directly affect the broadband characteristics of the broadband impedance converter 2. Preferably, the first multi-core stranded wire 22 is wound around the outer periphery of the first magnetic alloy ring 21 for 10 turns, and the impedance transformation ratio of the broadband impedance converter 2 is 1:9.

[0048] In a feasible embodiment of the present invention, in the broadband power divider 4, the nanocrystalline magnetic alloy strip 211 is wound around the outer periphery of the second magnetic alloy ring 41 for 10 turns with the second multi-core stranded wire 42. The voltage ratio between the input port and any output port of the broadband power divider 4 is 2:1. Among them, the broadband power divider 4 adopts the transmission line transformer technology.

[0049] Since the accuracy and performance consistency of the capacitive voltage division circuit 1 directly affect the accuracy of the final voltage sampling device, the broadband performance test and screening of each individual capacitor of the capacitive voltage division circuit 1 have relatively high requirements. As Figure 1 、 Figure 2 and Figure 7 shown, furthermore, in a feasible embodiment of the present invention, the capacitive voltage division circuit 1 includes a small-capacitance high-voltage capacitor 11 and a large-capacitance low-voltage capacitor 12. The small-capacitance high-voltage capacitor 11 is used to connect to the RF high-voltage end, and the small-capacitance high-voltage capacitor 11 has high voltage resistance and high power. One end of the large-capacitance low-voltage capacitor 12 is connected to the small-capacitance high-voltage capacitor 11, and the other end is connected to the broadband impedance converter 2; and the large-capacitance low-voltage capacitor 12 is grounded.

[0050] It should be noted that since the working mode of the RF voltage sampling device is broadband operation, it is required that both the small-capacitance high-voltage capacitor 11 and the large-capacitance low-voltage capacitor 12 have excellent capacitance-frequency characteristics, that is, the capacitance value error is small and the capacitance value change is small within the entire working frequency band.

[0051] In a feasible embodiment of the present invention, the capacitive voltage division circuit 1 includes two parallel paths, and each capacitive voltage division circuit 1 is connected to the broadband impedance converter 2. The high- and low-voltage capacitance values connected to the two balanced ends in the RF voltage sampling device need to be basically the same, that is, the smaller the error, the better, in order to ensure the consistency of the two sampling ratios.

[0052] It should be noted that the capacitances of the small-capacitance high-voltage capacitor 11 and the large-capacitance low-voltage capacitor 12 need to be tested and screened, and they are used after being combined and paired to ensure meeting the usage requirements.

[0053] In a feasible embodiment of the present invention, the small-capacitance high-voltage capacitor 11 is composed of two 30 pF high-voltage vacuum capacitors connected in parallel. The withstand voltage of a single vacuum capacitor is greater than 20 kV, and the maximum current it can withstand is 12 A.

[0054] In a feasible embodiment of the present invention, the thickness of the nanocrystalline magnetic alloy strip 211 is 13 - 18 microns. When the thickness of the nanocrystalline magnetic alloy strip 211 is reduced to this range, its core loss under pulsed excitation will be significantly reduced. Moreover, the thinner strip is easier to wind around the nanocrystalline and alloy ring body 31 to form a tight and stable structure.

[0055] The broadband radio frequency voltage sampling device provided by the present invention can meet both low-frequency characteristics and high-frequency band characteristics, with a large frequency range span of 0.2 MHz to 10 MHz. Therefore, it is applicable to all types of proton and heavy ion full-particle synchrotrons.

[0056] In summary, for the broadband radio frequency voltage sampling device provided by the present invention, by using the broadband impedance converter 2 designed with nanocrystalline soft magnetic alloy materials combined with transmission line transformer technology, the broadband impedance converter 2 is connected to the capacitive voltage division circuit 1 to achieve small-signal sampling output of radio frequency high voltage. Further, by using the broadband power divider 4 made of nanocrystalline soft magnetic alloy materials, the above small-signal sampling port is divided into two in-phase and equal-sized sampling output ports, and finally, high-precision voltage sampling of radio frequency high voltage in the broadband range is achieved through the radio frequency N-type connector 3. The sampling ratio of the broadband radio frequency voltage sampling device is jointly determined by the capacitance ratio of the capacitive voltage division and the voltage transformation ratio of the broadband impedance converter.

[0057] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0058] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "way", "specific way", or "some ways", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or way are included in at least one embodiment or way of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or way. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable way in any one or more embodiments or ways. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or ways described in this specification and the features of different embodiments or ways.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A broadband radio frequency voltage sampling device based on a magnetic alloy material, which is used in the high-frequency cavity of a particle accelerator, and is characterized in that Comprising: A capacitive voltage dividing circuit (1), one end for connecting to the RF high voltage terminal; the capacitive voltage dividing circuit (1) is used to adjust the multiple of the sampling ratio; A broadband impedance converter (2), one end connected to the other end of the capacitive voltage dividing circuit (1); and the broadband impedance converter (2) includes a first magnetic alloy ring (21) and a first multi-core stranded wire (22), the first multi-core stranded wire (22) is wound around the outer periphery of the first magnetic alloy ring (21); An RF N-type connector (3), connected to the other end of the broadband impedance converter (2), and the RF N-type connector (3) is a voltage sampling output port.

2. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 1, wherein It further includes a broadband power divider (4), connected to one end of the broadband impedance converter (2) facing away from the capacitive voltage dividing circuit (1), the broadband power divider (4) includes a second magnetic alloy ring (41) and a second multi-core stranded wire (42), the second multi-core stranded wire (42) is wound around the outer periphery of the second magnetic alloy ring (41); The RF N-type connector (3) includes two paths, and both paths of the RF N-type connector (3) are connected to the broadband power divider (4).

3. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 2, characterized in that Both the first magnetic alloy ring (21) and the second magnetic alloy ring (41) are wound into a ring shape by a nanocrystalline magnetic alloy strip (211), and the surface of the nanocrystalline magnetic alloy strip (211) is coated with a silica insulation coating.

4. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 3, characterized in that The surfaces of the first magnetic alloy ring (21) and the second magnetic alloy ring (41) are provided with a packaging layer (212).

5. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 3, wherein In the broadband impedance converter (2), the nanocrystalline magnetic alloy strip (211) is wound around the outer periphery of the nanocrystalline magnetic alloy ring body (31) for 10 turns by a multi-core stranded wire, and the impedance transformation ratio of the broadband impedance converter (2) is 1:

9.

6. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 3, wherein, In the broadband power divider (4), the nanocrystalline magnetic alloy strip (211) is wound around the outer periphery of the nanocrystalline magnetic alloy ring body (31) for 10 turns by a multi-core stranded wire, and the voltage ratio between the input port and any output port of the broadband power divider (4) is 2:

1.

7. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 1, characterized in that The capacitive voltage dividing circuit (1) includes: A small capacitance high voltage capacitor (11), for connecting to the RF high voltage terminal; A large capacitance low voltage capacitor (12), one end connected to the small capacitance high voltage capacitor (11), and the other end connected to the broadband impedance converter (2); and the large capacitance low voltage capacitor (12) is grounded.

8. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 7, characterized in that The capacitive voltage dividing circuit (1) includes two parallel paths, and each path of the capacitive voltage dividing circuit (1) is connected to the broadband impedance converter (2).

9. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 7, characterized in that, The small capacitance high voltage capacitor (11) is composed of two 30 pF high voltage vacuum capacitors connected in parallel, and the withstand voltage of a single vacuum capacitor is greater than 20 kV, and the maximum current it can withstand is 12 A.

10. The broadband radio frequency voltage sampling device based on a magnetic alloy material according to claim 3, wherein, The thickness of the nanocrystalline magnetic alloy strip is 13 - 18 microns.

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