Balanced track measuring device and method for small electronic induction accelerator

Abstract

The invention discloses a balance orbit measuring device and method for a small electronic induction accelerator, and mainly relates to the field of electronic accelerators. Comprising a Hall probe, a stepping motor, a motor controller, a gauss meter and a current source. The method further comprises the following steps: S1, calibrating the Hall probe; s2, setting parameters of a gauss meter and starting to record data; s3, setting controller parameters; s4, current source parameters are set; s5, starting a motor to drive a Hall probe to move; s6, waiting for the motor to stop; s7, proposing a magnetic flux density value and calculating average magnetic flux density; and S8, drawing curves, wherein the radius value corresponding to the second intersection point of the two curves is the track position. The method has the advantages that the magnetic flux density is measured, the average magnetic flux density is calculated, the acceleration orbit of electrons can be determined according to the second radius point where the curve of the half value of the average magnetic flux density intersects with the curve of the magnetic flux density value, and the method has the advantages of being efficient and accurate and can be well suitable for the small electronic induction accelerator.

Description

Technical Field

[0001] The invention relates to the field of electron accelerators, in particular to a balanced track measuring device and a measuring method for a small-sized electron induction accelerator. Background Art

[0002] Electron accelerators are widely used in the fields of nuclear physics, industry, nuclear medicine, etc. Compared with electron linear accelerators, small electron induction accelerators do not have complex microwave systems and water cooling systems. They have the advantages of small size and light weight, and have been widely used in non-destructive testing, cargo and vehicle security inspection systems. Small electron induction accelerators use a magnetic field whose intensity changes with time to generate a vortex electric field. Electrons are continuously accelerated by the vortex electric field on the equilibrium orbit, thereby gaining energy. When the predetermined energy is reached, the electrons are drawn out and hit the tungsten target to produce high-energy X-rays. Therefore, finding the equilibrium orbit position of electron acceleration is of great significance to the debugging and operation of the accelerator.

[0003] In the early days, there were two methods for measuring the equilibrium orbit of an electron induction accelerator: the coil method and the disk method. Both methods involve placing a measuring coil inside the accelerator magnet. The measuring coil is induced to produce an electromotive force by the accelerating magnetic field of the accelerator, and the electromotive force is proportional to the magnetic field strength. The corresponding magnetic field strength is calculated by measuring the voltage data obtained point by point in the radial direction of the measuring coil, and the position of the equilibrium orbit of the accelerator is calculated based on the magnetic field. However, the common disadvantages of the above methods are long measurement time, low accuracy, and measurement errors that can sometimes reach 20% to 50%. Therefore, the defects of the above measuring devices and methods have caused great difficulties in the development and debugging of accelerators. Until now, there has been no good device and method for rapid and accurate measurement of the equilibrium orbit of a small electron induction accelerator. Summary of the invention

[0004] The object of the present invention is to provide a balanced orbit measurement device and method for a small electronic induction accelerator. The device measures magnetic flux density and calculates average magnetic flux density based on the "2:1" physical relationship of the electronic induction accelerator. The acceleration orbit of the electron can be determined based on the second radius point where a curve of half the average magnetic flux density and a curve of the magnetic flux density value intersect. The device has the advantages of high efficiency and accuracy and can be well applied to small electronic induction accelerators.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A balanced track measuring device for a small electronic induction accelerator comprises a Hall probe, a stepping motor, a motor controller, a lead screw, a bracket, a rotating chassis, a Gauss meter, and a current source;

[0007] The rotating chassis is mounted on top of a small betatron magnet;

[0008] The stepper motor and the lead screw are both mounted on a rotating chassis, and the lead screw is connected to the stepper motor;

[0009] The end of the bracket is threadedly connected to the screw rod through the mounting block, and the bracket is slidably connected to the rotating chassis;

[0010] The Hall probe is installed at one end of the bracket away from the lead screw, and the Hall probe is electrically connected to the Gauss meter;

[0011] The motor controller is electrically connected to the stepper motor;

[0012] The current source is electrically connected to the miniature betatron magnet.

[0013] A measurement method using a balanced track measurement device for a small electronic beta accelerator comprises the following steps:

[0014] S1. Calibrate the Hall probe so that it is located in the center plane of the small electron induction accelerator magnet and the top of the Hall probe is at the zero point of the plane radius;

[0015] S2, set the Gauss meter sampling rate to 10kHz, the reading stabilization time to 1 second, and start recording data, and go to step S3;

[0016] S3, set the motor controller control step length to 0.2mm, the number of steps to 500, and go to step S4;

[0017] S4, setting the output current of the current source to 30A, and proceeding to step S5;

[0018] S5, start the motor controller to control the stepper motor to start, drive the Hall probe to start moving through the bracket, and enter step S6;

[0019] S6, waiting for the stepper motor to stop moving, and then proceeding to step S7;

[0020] S7. Take the magnetic flux density value measured at each radius point from the Gauss meter, and calculate the average magnetic flux density within the radius circle corresponding to each point. The calculation relationship is as follows:

[0021]

[0022] In the formula, r is the radius, B z (r) is the axial magnetic flux density at radius r, is the average magnetic flux density within the circle of radius corresponding to point r. After the calculation is completed, enter step S8;

[0023] S8. Draw a curve of the magnetic flux density value at each radius point and half of the average magnetic flux density within the corresponding radius circle. The radius value corresponding to the second intersection of the two curves is the equilibrium orbit position of the small electron induction accelerator.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The present invention is based on the physical relationship of "2:1" of the electron induction accelerator. Through a specific measurement method, the Hall probe is controlled to measure the axial magnetic flux density point by point on the central plane of the accelerator magnet, and then the average magnetic flux density in the circle area surrounded by the corresponding radius point is calculated. By drawing a curve of the magnetic flux density value of each radius point and half of the average magnetic flux density in the corresponding radius circle, the radius value corresponding to the second intersection of the two curves is the position of the accelerator balance track. The present invention automatically measures the magnetic flux density value at each point through a high-precision Hall probe, simplifies the structure of the measuring device, shortens the measurement time, has high measurement accuracy, effectively reduces measurement errors, realizes automatic, fast and accurate measurement, and can be well applied to small electron induction accelerators;

[0026] 2. The present invention has a simple structure and is easy to control. The stepping distance and number of steps of the stepping motor and the sampling rate of the Hall probe can be controlled according to the motor controller to improve the measurement efficiency and accuracy. It is very suitable for the measurement of the equilibrium orbit in a small electronic induction accelerator. The device and the measurement method of the present invention can be used to quickly measure the equilibrium orbit position of the accelerator, thereby providing data support for the next step of the development and debugging of the accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attached Figure 1 It is a schematic diagram of the device structure of the present invention.

[0028] Attached Figure 2 It is a control flow chart of the present invention.

[0029] Attached Figure 3 It is a curve diagram of the magnetic flux density of the present invention and half of the average magnetic flux density.

[0030] Numbers shown in the accompanying drawings:

[0031] 1. Hall probe; 2. Stepper motor; 3. Motor controller; 4. Screw; 5. Bracket; 6. Rotating chassis; 7. Gauss meter; 8. Current source; 9. Small electronic induction accelerator magnet. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0033] Embodiment 1: As attached Figure 1As shown, a balanced track measuring device for a small electronic induction accelerator includes a Hall probe 1, a stepper motor 2, a motor controller 3, a screw rod 4, a bracket 5, a rotating chassis 6, a Gauss meter 7, and a current source 8;

[0034] The rotating chassis 6 is mounted on the top of a small electronic beta accelerator magnet 9; the small electronic beta accelerator magnet 9 is an existing component of the small electronic beta accelerator;

[0035] The stepper motor 2 and the screw rod 4 are both mounted on the rotating chassis 6, and the screw rod 4 is connected to the stepper motor 2, and the stepper motor 2 drives the screw rod 4 to rotate;

[0036] The end of the bracket 5 is threadedly connected to the screw rod 4 through the mounting block, and the bracket 5 is slidably connected to the rotating chassis 6, that is, the bottom surface of the mounting block at the end of the bracket 5 contacts and slides with the surface of the rotating chassis 6, so that after the stepping motor 2 drives the screw rod 4 to rotate, the bracket 5 threadedly connected to the screw rod 4 through the mounting block can only slide horizontally along the length direction of the screw rod 4;

[0037] The Hall probe 1 is installed at one end of the bracket 5 away from the screw rod 4. The bracket 5 is L-shaped. The Hall probe 1 and the screw rod 4 are connected by the bracket 5, so that the stepper motor 2 can drive the Hall probe 1 to move horizontally through the bracket 5, and the Hall probe 1 is electrically connected to the gaussmeter 7, and the magnetic flux density value is directly measured by the gaussmeter 7;

[0038] The motor controller 3 is electrically connected to the stepper motor 2, and the start and stop of the stepper motor 2 are automatically controlled by inputting parameters into the motor controller 3, thereby realizing the automatic movement of the Hall probe 1, simplifying the operation, avoiding manual operation errors, and improving the accuracy of the measurement data;

[0039] The current source 8 is electrically connected to a small betatron magnet 9 .

[0040] The stepper motor 2 is controlled by the motor controller 3 to drive the Hall probe 1 to automatically move a set distance. During the process, the Gauss meter 7 automatically samples and records data. The device has a simple structure and is easy to control, which improves measurement efficiency and accuracy and avoids manual operation errors.

[0041] Embodiment 2: As attached Figure 2 As shown, a measurement method using a balanced track measurement device for a small electronic beta accelerator comprises the following steps:

[0042] S1, calibrate the Hall probe 1 so that it is located in the center plane of the small electron beta accelerator magnet 9, and the top of the Hall probe 1 is at the zero point of the plane radius;

[0043] S2, set the sampling rate of Gauss meter 7 to 10kHz, the reading stabilization time to 1 second, and start recording data, and go to step S3;

[0044] S3, set the control step length of motor controller 3 to 0.2 mm and the number of steps to 500, and proceed to step S4;

[0045] S4, setting the output current of the current source 8 to 30A, and proceeding to step S5;

[0046] S5, start the motor controller 3 to control the stepper motor 2 to start, drive the Hall probe 1 to start moving through the bracket 5, and enter step S6;

[0047] S6, waiting for the stepper motor 2 to stop moving, and then proceeding to step S7;

[0048] S7. Take the magnetic flux density value measured at each radius point from the Gaussmeter 7, and calculate the average magnetic flux density within the radius circle corresponding to each point. The calculation relationship is as follows:

[0049]

[0050] In the formula, r is the radius, B z (r) is the axial magnetic flux density at radius r, is the average magnetic flux density within the circle of radius corresponding to point r. After the calculation is completed, enter step S8;

[0051] S8. Draw a curve showing the magnetic flux density value at each radius point and half of the average magnetic flux density within the corresponding radius circle, as shown in the attached figure. Figure 3 As shown in the figure, the radius value corresponding to the second intersection point of the two curves is the equilibrium orbit position of the small electron sensing accelerator.

[0052] By using the measuring device and the measuring method of the present invention, the equilibrium orbit position of a small electron induction accelerator can be quickly and accurately obtained, thereby providing data support for the next step of development and debugging of the accelerator.

[0053] The present invention is based on the physical relationship of "2:1" of the electron induction accelerator and can quickly determine the position of the accelerator balance orbit through a specific measurement method, simplify the structure of the measuring device, shorten the measurement time, increase the measurement accuracy, effectively reduce the measurement error, and realize automatic rapid and accurate measurement. It can be well applied to small electron induction accelerators. The present invention has a simple structure and is easy to control, and can improve the measurement efficiency and accuracy, so it is very suitable for the measurement of the balance orbit in a small electron induction accelerator.

Claims

1. A balanced orbit measurement device for a small electronic beta accelerator, characterized in that: It includes a Hall probe (1), a stepper motor (2), a motor controller (3), a lead screw (4), a bracket (5), a rotating chassis (6), a Gauss meter (7), and a current source (8); The rotating chassis (6) is mounted on the top of a small betatron magnet (9); The stepping motor (2) and the screw rod (4) are both mounted on a rotating chassis (6), and the screw rod (4) is connected to the stepping motor (2); The end of the bracket (5) is threadedly connected to the screw rod (4) through a mounting block, and the bracket (5) is slidably connected to the rotating chassis (6); The Hall probe (1) is mounted on an end of the bracket (5) away from the screw rod (4), and the Hall probe (1) is electrically connected to the Gauss meter (7); The motor controller (3) is electrically connected to the stepper motor (2); The current source (8) is electrically connected to a small betatron magnet (9).

2. A measurement method using the balanced orbit measurement device for a small electronic beta accelerator according to claim 1, characterized in that: The following steps are involved: S1, calibrating the Hall probe (1) so that it is located in the center plane of the small electron beta accelerator magnet (9) and the top of the Hall probe (1) is located at the zero point of the plane radius; S2, set the sampling rate of the Gaussmeter (7) to 10kHz, the reading stabilization time to 1 second, and start recording data, and go to step S3; S3, setting the control step length of the motor controller (3) to 0.2 mm and the number of steps to 500, and proceeding to step S4; S4, setting the output current of the current source (8) to 30A, and proceeding to step S5; S5, starting the motor controller (3) to control the stepper motor (2) to start, driving the Hall probe (1) to start moving through the bracket (5), and entering step S6; S6, waiting for the stepper motor (2) to stop moving, and then entering step S7; S7. Take the magnetic flux density value measured at each radius point from the Gauss meter (7), and calculate the average magnetic flux density within the radius circle corresponding to each point. The calculation relationship is as follows: In the formula, r is the radius, B z (r) is the axial magnetic flux density at radius r, is the average magnetic flux density within the circle of radius corresponding to point r. After the calculation is completed, enter step S8; S8. Draw a curve of the magnetic flux density value at each radius point and half of the average magnetic flux density within the corresponding radius circle. The radius value corresponding to the second intersection of the two curves is the equilibrium orbit position of the small electron induction accelerator.

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