A non-intercepting AC current intensity measurement detector with self-calibration and use method thereof

Abstract

The present invention relates to a non-intercepting AC current intensity measurement detector with self-calibration and a method for using the detector, comprising: ceramics, the ceramics are inserted into a vacuum pipe, and the two ends of the ceramics are brazed and connected to the vacuum pipe; a mounting flange, a hole matching the outer wall of the vacuum pipe is arranged in the middle, and is used to fix the vacuum pipe; a device cavity surrounding the hole is formed between the inner wall of the mounting flange and the outer wall of the vacuum pipe, and a magnetic ring is arranged in the device cavity; an induction coil winding and a calibration coil winding are respectively wound on opposite sides of the magnetic ring, and the two ends of the coil of the induction coil winding are respectively connected to the output port feed-through; the two ends of the coil of the calibration coil winding are respectively connected to the mounting flange housing and the calibration port feed-through; a magnetic shielding layer is arranged outside the induction coil winding and the calibration coil winding. The present invention can be widely used in the field of accelerator beam diagnosis.

Description

Technical Field

[0001] The invention relates to a non-intercepting alternating current intensity measuring detector with self-calibration and a use method thereof, and belongs to the field of accelerator beam current diagnosis. Background Art

[0002] Beam current intensity is the most core parameter for the operation of various types of accelerators. The absolutely accurate measurement of beam current intensity is also the primary beam measurement task, which plays an indispensable role in the accelerator debugging, acceptance and operation stages.

[0003] At present, interception Faraday cups are usually used as absolute current measurement tools, but Faraday cups have their own defects. For example, they can only be used for low-energy weak beam current measurement. Because when heavy ions with higher energy and higher mass (such as 238U46+ beam, 15.5 MeV / u) are intercepted by Faraday cups, the energy of the secondary electrons generated is as high as several keV, which is difficult to be suppressed by the bias voltage usually used in Faraday cups and escape, resulting in the inability to accurately measure the current intensity. Higher energy beams will penetrate the Faraday cup and beam measurement will be impossible. In addition, for high-current and high-power machines, Faraday cups are easily damaged by high power or thermal deposition. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a non-intercepting AC current intensity measurement detector with self-calibration and a method of use. The sensor probe has a sufficiently wide bandwidth and sufficiently superior linearity within the working bandwidth, and can perform absolutely accurate measurements of the beam AC current intensity.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A non-intercepting AC current intensity measurement detector with self-calibration, comprising:

[0007] A ceramic is inserted into a vacuum pipe, and two ends of the ceramic are connected to the vacuum pipe by brazing;

[0008] A mounting flange, wherein a hole matching the outer wall of the vacuum pipe is provided in the middle of the mounting flange for fixing the vacuum pipe; a device cavity is formed between the inner wall of the mounting flange and the outer wall of the vacuum pipe, and a magnetic ring is provided in the device cavity;

[0009] The induction coil winding and the calibration coil winding are wound on opposite sides of the magnetic ring according to a preset ratio, and the two ends of the coil of the induction coil winding are respectively connected to two output port feedthroughs arranged outside the mounting flange; the two ends of the coil of the calibration coil winding are respectively connected to the mounting flange housing and the calibration port feedthrough;

[0010] The magnetic shielding layer is arranged outside the induction coil winding and the calibration coil winding.

[0011] Furthermore, the radius size of the ceramic matches the inner diameter of the vacuum pipe.

[0012] Furthermore, the magnetic ring is made of 7-10nm nanocrystalline ribbon material.

[0013] Furthermore, the induction coil winding and the calibration coil winding are both wound with polyesterimide material pure copper enameled wire with a diameter of 0.3-1.0 mm.

[0014] Furthermore, the magnetic shielding layer is made of Permalloy and has a thickness of 1 to 3 mm.

[0015] Furthermore, the magnetic shielding layer and the mounting flange are fixed in place using insulating material.

[0016] Furthermore, the calibration port feedthrough and the output port feedthrough both use radio frequency-specific SMA signal connectors and are located on opposite sides of the mounting flange.

[0017] In a second aspect, the present invention provides a method for using a non-intercepting AC current intensity measurement detector with self-calibration, which comprises the following steps:

[0018] The non-intercepting AC current intensity measurement detector with self-calibration is quantitatively calibrated to obtain the linear relationship between its output voltage signal and beam current intensity.

[0019] A non-intercepting AC current intensity measurement detector with self-calibration is installed in the accelerator, so that the beam to be detected output by the accelerator passes through the vacuum pipe of the non-intercepting AC current intensity measurement detector with self-calibration;

[0020] Based on the voltage signal and linear relationship output by a non-intercepting AC current intensity measurement detector with self-calibration, the AC current intensity of the beam to be detected is obtained.

[0021] Furthermore, the quantitative calibration of the non-intercepting AC current intensity measurement detector with self-calibration to obtain the linear relationship between its output voltage signal and the beam current intensity includes the following steps:

[0022] Connect the calibration port feedthrough of the non-intercepting AC current intensity measurement detector with self-calibration to the output end of the preset current source, and connect the two output signal feedthroughs to the standard IV conversion circuit as differential outputs;

[0023] A beam of known current intensity is introduced into the hole of a non-intercepting AC current intensity measurement detector with self-calibration, and quantitative calibration is performed according to the output signal of the IV conversion circuit to obtain a linear relationship between the transmission voltage signal and the beam current intensity.

[0024] Furthermore, the preset current source adopts a standard commercial current source.

[0025] The present invention adopts the above technical solution, which has the following advantages:

[0026] 1. The present invention installs a winding magnetic ring inside the detector, and uses the winding magnetic ring to sense the magnetic field generated by the beam, so as to accurately measure the beam current intensity signal;

[0027] 2. The present invention adopts a magnetic shielding layer with high magnetic permeability, which can effectively improve the magnetic shielding performance of the device and provide a guarantee for accurate measurement of beam signals;

[0028] 3. The present invention adopts enameled wire for winding in strict proportion and manner, which can effectively improve the working bandwidth and linearity of the device to adapt to more working scenarios;

[0029] 4. The present invention adds a self-calibration function, which can calibrate the entire detector online in real time without physically disassembling the entire detector, which can greatly facilitate online use and maintenance;

[0030] 5. The whole device of the present invention is a passive structure with compact size, reliable structure, good processability and service life;

[0031] 6. The present invention fixes the vacuum pipe, the induction coil winding, the calibration coil winding, etc. through the installation flange, and the installation, operation and maintenance of the whole machine are simple and reliable.

[0032] The present invention can be widely applied in the field of accelerator beam diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings:

[0034] Figure 1 Schematic diagram of the overall structure of a non-intercepting AC current intensity measurement detector with self-calibration in an embodiment of the present invention;

[0035] Figure 2 It is a cross-sectional view of the overall structure of a non-intercepting AC current intensity measurement detector with self-calibration in an embodiment of the present invention;

[0036] Figure 3 Schematic diagram of the internal magnetic ring and winding of the non-intercepting AC current intensity measurement detector with self-calibration in the embodiment of the present invention;

[0037] Figure 4It is a block diagram of a voltage current coefficient test system of a non-intercepting AC current measurement detector with self-calibration in an embodiment of the present invention;

[0038] Figure 5 This is a graph showing the voltage current coefficient test results of a non-intercepting AC current measurement detector with self-calibration in an embodiment of the present invention;

[0039] Figure 6 1 is a block diagram of a working bandwidth test system of a non-intercepting AC current intensity measurement detector with self-calibration in an embodiment of the present invention;

[0040] Figure 7 This is a graph showing the working bandwidth test results of a non-intercepting AC current intensity measurement detector with self-calibration in an embodiment of the present invention;

[0041] The reference numerals in the figures are as follows:

[0042] 1. Ceramic; 2. Vacuum pipe; 3. Mounting flange; 4. Magnetic ring; 5. Induction coil winding; 6. Calibration coil winding; 7. Magnetic shielding layer; 8. Calibration port feedthrough; 9. Output port feedthrough. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] In some embodiments of the present invention, a non-intercepting AC current intensity measurement detector with self-calibration is provided, and the measurement principle is to measure the beam current intensity by measuring the magnetic field generated by the beam current. Specifically, the present invention regards the beam current as an infinitely long straight wire carrying current. According to the Ampere loop theorem, the line current on the infinitely long straight wire will generate a magnetic field. The present invention installs a winding magnetic ring inside the detector, and the winding magnetic ring will sense the magnetic field generated by the line current, and then measure the output voltage signal. By quantitatively calibrating the linear relationship between the output voltage signal and the beam current intensity, the real-time beam current intensity is obtained.

[0046] In addition, the accelerator site is often filled with complex electromagnetic environments and isotropic magnetic fields. After long-term use, the winding magnetic ring material will be magnetized to a certain extent, causing its magnetic permeability to change, and then the linear coefficient corresponding to the output voltage signal and the beam current intensity will change. In actual use, the detector often acts as a part of the vacuum pipeline installed at the required measurement position of the accelerator, which is generally not convenient to disassemble. Therefore, on the basis of realizing the non-interception type accurate measurement of the beam AC current intensity, the present invention adds a calibration coil structure inside the detector to realize the self-calibration function of the accelerator after long-term online use, without the need to physically disassemble the entire detector, which greatly facilitates the later maintenance and inspection.

[0047] Example 1

[0048] like Figure 1 to Figure 3 As shown, this embodiment provides a non-intercepting AC current intensity measurement detector with self-calibration, which measures the AC current intensity of the beam by measuring the magnetic field generated by the beam. Specifically, it includes: ceramic 1, vacuum pipe 2, mounting flange 3, magnetic ring 4, induction coil winding 5, calibration coil winding 6, magnetic shielding layer 7, calibration port feedthrough 8 and output port feedthrough 9.

[0049] The ceramic 1 is inserted into the vacuum pipe 2, and both ends of the ceramic 1 are connected to the vacuum pipe 2 by brazing;

[0050] A hole matching the outer wall of the vacuum pipe 2 is provided in the middle of the mounting flange 3, which is used to fix the vacuum pipe 2 when the mounting flange is locked;

[0051] A device cavity is formed between the inner wall of the mounting flange 3 and the outer wall of the vacuum pipe 2, and a magnetic ring 4 is arranged in the device cavity;

[0052] The induction coil winding 5 and the calibration coil winding 6 are respectively wound on opposite sides of the magnetic ring 4 according to a preset ratio, and the two ends of the coil of the induction coil winding 5 are respectively connected to two output port feedthroughs 9 arranged outside the mounting flange 3; the two ends of the coil of the calibration coil winding 6 are respectively connected to the mounting flange housing and the calibration port feedthrough 8;

[0053] The magnetic shielding layer 7 is arranged outside the induction coil winding 5 and the calibration coil winding 6 to improve the magnetic shielding performance of the detector.

[0054] Furthermore, the radius of the ceramic 1 matches the inner diameter of the vacuum pipe 2 .

[0055] Furthermore, the magnetic ring 4 is made of 7-10nm nanocrystalline ribbon material, and its size is determined by the size of the ceramic 1, the magnetic shielding layer 7 and the mounting flange. In fact, the size and material of the magnetic ring 4 can be selected from different materials according to actual needs, and the present invention does not limit this.

[0056] Furthermore, the induction coil winding 5 and the calibration coil winding 6 are both wound with polyesterimide material pure copper enameled wire with a diameter of 0.3-1.0 mm.

[0057] Furthermore, the magnetic shielding layer 7 is made of a high magnetic permeability magnetic material, such as Permalloy, with a thickness of 1 to 3 mm.

[0058] Furthermore, the magnetic shielding layer 7 and the mounting flange 3 are fixed with insulating material.

[0059] Furthermore, the calibration port feedthrough 8 and the output port feedthrough 9 both use radio frequency-specific SMA signal connectors and are located on opposite sides of the mounting flange 3 .

[0060] Compared with the prior art, the present invention has a self-calibration function, which can be calibrated online in real time at any time, providing a basic guarantee for accurately measuring the beam AC current intensity; the present invention has a special magnetic shielding layer, which is less susceptible to environmental electromagnetic interference; the whole machine of the present invention is a passive structure, compact in size, and has good machinability and service life. The present invention can be applied to any accelerator online non-interceptive current intensity measurement.

[0061] Example 2

[0062] Based on the non-intercepting AC current intensity measurement detector with self-calibration provided in Example 1, this embodiment provides a method for using the non-intercepting AC current intensity measurement detector with self-calibration, which includes the following steps:

[0063] 1) Quantitatively calibrate the non-intercepting AC current intensity measurement detector with self-calibration to obtain the linear relationship between its output voltage signal and beam current intensity;

[0064] 2) installing a self-calibrated non-intercepting AC current intensity measurement detector in the accelerator, so that the beam to be detected output by the accelerator passes through the vacuum pipe 2 of the self-calibrated non-intercepting AC current intensity measurement detector;

[0065] 3) Based on the voltage signal output by the non-intercepting AC current intensity measurement detector with self-calibration and the linear relationship in step 1), the AC current intensity of the beam to be detected is obtained.

[0066] Furthermore, in the above step 1), the non-intercepting AC current intensity measurement detector with self-calibration is quantitatively calibrated to obtain a linear relationship between its output voltage signal and the beam current intensity, including the following steps:

[0067] 1.1) Connect the calibration port feedthrough 8 of the non-intercepting AC current intensity measurement detector with self-calibration to the output end of the preset current source, and connect the two output signal feedthroughs 9 as differential outputs to the standard IV conversion circuit;

[0068] 1.2) A beam of known current intensity is introduced into the hole of a self-calibrated non-intercepting AC current intensity measurement detector, and quantitative calibration is performed based on the output signal of the IV conversion circuit to obtain a linear relationship between the transmission voltage signal and the beam current intensity.

[0069] Furthermore, in the above step 1.1), the preset current source may be a standard commercial current source.

[0070] Furthermore, the method further comprises the following steps:

[0071] 4) Perform self-calibration on the non-intercepting AC current intensity measurement detector with self-calibration at preset intervals or according to actual needs.

[0072] Specifically, whether in an offline state or an online state after being installed on an accelerator, a standard commercial current source can be used to output a current signal to the calibration port feedthrough 8, and the self-calibration function can be used at any time to self-calibrate the detector. The self-calibration method is similar to the quantitative calibration in step 1), and the present invention will not repeat it in detail.

[0073] like Figure 5 As shown in Figure 4 The actual experimental scene is built under the test block diagram shown, and the voltage and current coefficient test result diagram is measured. Figure 5 The results show that when the input is a rectangular current of ±1mA@5kHz and a duty cycle of 50%, the detector output is ±521.4mV;

[0074] like Figure 6 The figure shows the working bandwidth test system block diagram of the non-intercepting AC current intensity measurement detector with self-calibration. Figure 1 The calibration port feedthrough 8 of the non-intercepting AC current intensity measurement detector with self-calibration is short-circuited to the signal output terminal of the signal source, and the output port feedthrough 9 is connected to the signal input terminal of the oscilloscope via an IV conversion circuit;

[0075] Figure 7 For Figure 6 The actual experimental scene is built under the test block diagram shown, and the working bandwidth test result diagram is measured. Figure 7 The results show that the working bandwidth of the non-intercepting AC current intensity measurement detector with self-calibration is 9.4Hz~1.05MHz.

[0076] 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 it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A non-intercepting AC current intensity measurement detector with self-calibration, characterized in that: include: A ceramic is inserted into a vacuum pipe, and two ends of the ceramic are connected to the vacuum pipe by brazing; A mounting flange, wherein a hole matching the outer wall of the vacuum pipe is provided in the middle of the mounting flange for fixing the vacuum pipe; a device cavity is formed between the inner wall of the mounting flange and the outer wall of the vacuum pipe, and a magnetic ring is provided in the device cavity; The induction coil winding and the calibration coil winding are wound on opposite sides of the magnetic ring according to a preset ratio, and the two ends of the coil of the induction coil winding are respectively connected to two output port feedthroughs arranged outside the mounting flange; the two ends of the coil of the calibration coil winding are respectively connected to the mounting flange housing and the calibration port feedthrough; A magnetic shielding layer is arranged outside the induction coil winding and the calibration coil winding; The calibration port feedthrough and the output port feedthrough both use radio frequency-specific SMA signal connectors and are located on opposite sides of the mounting flange; The magnetic shielding layer is made of Permalloy material and has a thickness of 1 to 3 mm.

2. A non-intercepting AC current intensity measurement detector with self-calibration as claimed in claim 1, characterized in that: The radius size of the ceramic matches the inner diameter of the vacuum pipe.

3. A non-intercepting AC current intensity measurement detector with self-calibration as claimed in claim 1, characterized in that: The magnetic ring is made of 7-10 nm nanocrystalline ribbon material.

4. A non-intercepting AC current intensity measurement detector with self-calibration as claimed in claim 1, characterized in that: The induction coil winding and the calibration coil winding are both wound with polyesterimide material pure copper enameled wire with a diameter of 0.3-1.0 mm.

5. The non-intercepting AC current intensity measurement detector with self-calibration as claimed in claim 1, characterized in that: The magnetic shielding layer and the mounting flange are fixed in place using insulating material.

6. A method for using the non-intercepting AC current intensity measurement detector with self-calibration as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: The non-intercepting AC current intensity measurement detector with self-calibration is quantitatively calibrated to obtain the linear relationship between its output voltage signal and beam current intensity. A non-intercepting AC current intensity measurement detector with self-calibration is installed in the accelerator, so that the beam to be detected output by the accelerator passes through the vacuum pipe of the non-intercepting AC current intensity measurement detector with self-calibration; Based on the voltage signal and linear relationship output by a non-intercepting AC current intensity measurement detector with self-calibration, the AC current intensity of the beam to be detected is obtained.

7. The method for using the non-intercepting AC current intensity measurement detector with self-calibration as claimed in claim 6, characterized in that: The method of quantitatively calibrating the non-intercepting AC current intensity measurement detector with self-calibration to obtain a linear relationship between its output voltage signal and the beam current intensity includes the following steps: Connect the calibration port feedthrough of the non-intercepting AC current intensity measurement detector with self-calibration to the output end of the preset current source, and connect the two output signal feedthroughs to the standard IV conversion circuit as differential outputs; A beam of known current intensity is introduced into the hole of a non-intercepting AC current intensity measurement detector with self-calibration, and quantitative calibration is performed according to the output signal of the IV conversion circuit to obtain a linear relationship between the transmission voltage signal and the beam current intensity.

8. The method for using the non-intercepting AC current intensity measurement detector with self-calibration as claimed in claim 7, characterized in that: The preset current source adopts a standard commercial current source.

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