CN110703164B - Magnetic shielding magnetic field measuring device of cyclotron - Google Patents
Magnetic shielding magnetic field measuring device of cyclotron Download PDFInfo
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- CN110703164B CN110703164B CN201910996329.0A CN201910996329A CN110703164B CN 110703164 B CN110703164 B CN 110703164B CN 201910996329 A CN201910996329 A CN 201910996329A CN 110703164 B CN110703164 B CN 110703164B
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- 235000017491 Bambusa tulda Nutrition 0.000 claims description 14
- 241001330002 Bambuseae Species 0.000 claims description 14
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 14
- 239000011425 bamboo Substances 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 14
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- 230000000694 effects Effects 0.000 claims description 7
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- 238000007906 compression Methods 0.000 claims description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/07—Hall effect devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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Abstract
The invention provides a magnetic shielding magnetic field measuring device of a cyclotron, which is characterized in that: the device comprises a supporting seat, a Hall probe bracket and an adjustable supporting rod; the support seat comprises a semicircular base and a top seat which are respectively arranged at two ends of the adjustable support rod and form a plane with the adjustable support rod, and the length between the adjustable support rod and the highest point of the semicircular bases at the two ends is matched with the diameter of the magnetic shielding cylinder to be measured; the Hall probe bracket plane vertically passes through the adjustable support rod and moves along the axial direction of the adjustable support rod between the base and the top seat or the radial direction of the magnetic shielding barrel; the magnetic shielding magnetic field measuring device can do linear motion along the axial direction of the magnetic shielding cylinder, can do circumferential motion along the axial direction of the magnetic shielding cylinder, can also achieve radial motion along the radius of the magnetic shielding cylinder, and achieves magnetic field measurement at multiple points and different positions in the magnetic shielding cylinder. The invention solves the new technical problem of performing magnetic shielding test at any point in a narrow space.
Description
Technical Field
The invention relates to the field of cyclotrons, in particular to a magnetic shielding magnetic field measuring device of a cyclotron.
Background
The cyclotron is a particle accelerator, and the core structure of the cyclotron is a device which is provided with a magnetic field system and a Radio Frequency (RF) system, makes charged particles perform cyclotron motion under the combined action of a magnetic field and an electric field, and repeatedly accelerates the cyclotron charged particles by using the high-frequency electric field. To prevent energy loss from collisions with other atoms in the charged particle motion, it is necessary to provide high vacuum operating conditions.
The magnetic field strength of the central region of the superconducting cyclotron reaches about 2-3T, and the leakage magnetic field near the main magnet can be about 500 Gs-2000 Gs. These leakage magnetic fields can affect the operation of components around the accelerator, for example, the components moving such as a molecular pump, a cryopump, a vacuum valve and the like can be affected by the leakage magnetic fields, and the conventional molecular pump, the cryopump and the like all require the environmental intensity of the working magnetic field to be lower than 50Gs. Therefore, it is necessary to shield these components from magnetic fields, and in order to improve the shielding effect on magnetic fields, the general principle is to reduce the openings as much as possible and increase the shielding effect of magnetic shielding. Therefore, the whole magnetic shielding space is compact, and the residual magnetism inside the magnetic shielding is not easy to measure.
Disclosure of Invention
The invention provides a magnetic shielding magnetic field measuring device of a cyclotron aiming at the problems existing in the prior art, and aims to solve the problem of arbitrarily measuring the magnetic field of each point in a narrow magnetic shielding barrel and improve the accuracy of magnetic field data measurement.
The invention provides the following technical scheme for solving the technical problems.
A magnetic shielding magnetic field measuring device of a cyclotron, characterized in that: the device comprises a supporting seat, a Hall probe bracket and an adjustable supporting rod; the support seat comprises a semicircular base and a top seat which are respectively arranged at two ends of the adjustable support rod and form a plane with the adjustable support rod, and the length between the adjustable support rod and the highest point of the semicircular bases at the two ends is matched with the diameter of the magnetic shielding cylinder to be measured; the Hall probe bracket plane vertically passes through the adjustable support rod and moves along the axial direction of the adjustable support rod between the base and the top seat or the radial direction of the magnetic shielding barrel; the magnetic shielding magnetic field measuring device can do linear motion along the axial direction of the magnetic shielding cylinder, can do circumferential motion along the axial direction of the magnetic shielding cylinder, can also achieve radial motion along the radius of the magnetic shielding cylinder, and achieves magnetic field measurement at multiple points and different positions in the magnetic shielding cylinder.
The circular arc on the outer circle radius R of the base and the top seat is matched with the circular arc on the inner circle radius R of the magnetic shielding cylinder, the inner sides of the base and the top seat are connected with the adjustable supporting rod, and the connecting holes of the base and the top seat are connected in a C-shaped key slot-like quick-dismantling mode, so that the connection is convenient, and the rotation of the base and the top seat can be prevented.
The adjustable supporting rod comprises a guide rod, an adjustable nut, a spring and a top rod; the lower part of the guide rod is internally provided with a spring, the lower part of the spring is internally provided with a push rod, the lower end of the push rod is connected with an adjustable nut, and the external thread of the adjustable nut is connected with the internal thread of the guide rod; the compression amount of the spring is changed by adjusting the adjustable nut, so that the length change of the adjustable supporting rod is realized, and the magnetic field measurement of magnetic shielding barrels with different diameters is realized.
The Hall probe bracket comprises a guide block, a pressing plate and a butterfly lock nut; the outline of the guide block is a flat rectangle, the upper surface and the lower surface of the flat rectangle close to the two ends in the length direction respectively penetrate through a round hole, and the diameters of the two round holes are respectively matched with the diameter of the cylinder of the adjustable support rod; the center of the upper surface of the guide block penetrates through the front and rear surfaces of the guide block and is downwards provided with three stepped layers of grooves, stepped three layers of square holes are formed in the side surface of the guide block, the Hall probe can be fixed in different square holes, magnetic field measurement in three different directions of XYZ can be achieved, and magnetic field measurement in different positions of the magnetic shielding barrel along the radial direction can be achieved by adjusting the relative positions of the guide block and the guide rod.
The guide block is characterized in that the front and rear of the guide block is penetrated by a stepped three-layer groove, the uppermost layer groove is used for placing a pressing plate, the middle layer groove is used for arranging a Hall probe in the Z-axis direction, the lower layer groove and the other groove on the same plane form a cross groove in a cross manner, and the two grooves of the cross groove are respectively provided with the Hall probe in the X-axis direction and the Hall probe in the Y-axis direction.
The pressing plate is used for fixing the Hall probe, and the butterfly lock nut is used for fixing the position of the guide block relative to the guide rod.
All materials of the measuring device are made of non-ferrous materials which are non-magnetic, and the measuring device comprises materials for manufacturing a supporting seat, a Hall probe bracket and an adjustable supporting rod, and is made of aluminum or nylon, so that the measuring device can move in the magnetic shielding barrel due to non-magnetic conduction.
The total length between the semicircular highest points of the bases at the two ends of the adjustable supporting rod is 3-5 mm larger than the diameter of the magnetic shielding cylinder, and the measuring device with the total length being 3-5 mm larger than the diameter of the magnetic shielding cylinder can be installed in the magnetic shielding cylinder through the compression spring due to the fact that the spring of the adjustable supporting rod of the measuring device is compressible, so that the clamping and positioning effects are achieved.
The brown length of base and footstock cooperatees with magnetic shielding section of thick bamboo test hole length, the thickness of base and footstock cooperatees with magnetic shielding section of thick bamboo test hole width.
Advantageous effects of the invention
1. According to the invention, the two semicircular bases on the adjustable supporting rod are arranged, and the cambered surfaces of the semicircular bases are completely matched with the inner wall of the cylinder, so that the accurate alignment of the measuring device and each test point on the inner wall of the magnetic shielding cylinder is facilitated; the relative positioning of the butterfly lock nut and the adjustable support rod is continuously adjusted according to the requirement by arranging the guide block, the pressing plate and the butterfly lock nut on the adjustable support rod, so that the Hall probe support can reciprocate to a radial target test point along the adjustable support rod, and the radial test of the measuring device on the magnetic shielding cylinder is realized; through setting up the ingenious cooperation of adjustable bracing piece and both ends supporting seat total length and magnetic shielding section of thick bamboo internal diameter for measuring device chucking through the compressive force of spring is positioned on the inner wall of section of thick bamboo, can do 360 degrees rotations and reciprocates on the inner wall of section of thick bamboo, thereby realizes circumference test and axial test. According to the invention, the adjustable support rod, the support seat and the Hall probe support are organically combined, so that the novel technical problem of performing magnetic shielding test at any point in a narrow space is solved, all parts are mutually supported and mutually dependent after combination, and the effect is much better than that before combination.
2. The invention solves the technical problems that the leakage magnetic field near the main magnet of the superconducting cyclotron is about 500 Gs-2000 Gs for a long time in the field, the environment intensity of the working magnetic field is required to be lower than 50Gs for the conventional molecular pump, the cryogenic pump and the like, and the magnetic shielding space around the component is compact, so that the measurement of residual magnetism inside the magnetic shielding is difficult, and the environment intensity of the magnetic field of the surrounding component is far higher than 50 Gs. Through the axial movement, circumferential movement and radial movement of the measuring device, the testing of any point of the residual magnetic field in a compact space is realized, and the requirement that the environmental intensity of the working magnetic field such as a conventional molecular pump, a cryopump and the like is lower than 50Gs is met through the measurement and shielding of the residual magnetic field, so that the measuring device has outstanding substantive characteristics.
Drawings
FIG. 1 is a schematic diagram of a magnetic shielding magnetic field measurement device;
FIG. 2 is a schematic view of an adjustable support bar;
FIG. 3 is a schematic view of a Hall probe bracket structure;
FIG. 4 is a side view and top view of a guide block;
FIG. 5 is a cover plate;
FIG. 6 is a schematic view of a measurement device installation inlet;
FIG. 7 is an axial test schematic;
FIG. 8 is a circumferential test schematic;
FIG. 9 is a schematic diagram of a radial test;
FIG. 10 is a test assembly diagram;
In the figure, 1: a support base; 2: an adjustable support bar; 3: a Hall probe bracket; 2-1: a guide rod; 2-2: a push rod; 2-3: 2-4 springs of adjustable nuts; 3-1: a guide block; 3-2 pressing plates; 3-3 butterfly lock nuts; 3-4 rectangular holes 1;3-4 rectangular holes 2;3-6 rectangular holes
Detailed Description
Principle of design of the invention
1. Magnetic shielding barrel structure. The magnetic shielding cylinder is formed by butt joint of two semi-cylindrical shells, and the middle is connected by a flange. A rectangular access hole is formed in the side wall, close to the end face of the cylinder, and the width of the rectangular access hole is about 80 mm, and the length of the rectangular access hole is about 270 mm. The invention designs that the length of the support seat is necessarily smaller than the length of the rectangular access hole, and designs that the length of the support seat is 50% of the length of the rectangular access hole, and the rest 50% of the length is left for the manual operation; the measuring device width (thickness of the measuring device) is of the order of 20 mm.
2. A method of installing a measuring device. As shown in fig. 6, the arc surface of the semicircular supporting seat at one end of the measuring device is aligned with the rectangular square hole and is put down along the diameter direction of the cylinder; because the total length between the semicircular highest points at the two ends of the adjustable supporting rod is 3-5 mm greater than the diameter of the cylinder, the spring needs to be slightly compressed during installation so that the length is shortened, and the measuring device can be pushed into the cylinder.
3. Preparation before testing. The magnetic shielding cylinder is convenient to disassemble and assemble under the condition of no excitation, after the disassembly is finished, the point is firstly finished, after the point is finished, the magnetic shielding cylinder is then assembled for re-excitation, and then the measuring device is put into the magnetic shielding cylinder and the magnetic field is removed. Specifically, positions to be measured are set in the magnetic shielding cylinder in advance, points corresponding to the measured positions are drawn in the magnetic shielding cylinder before installation, and after the measuring device is installed in, the points corresponding to the positions are found through the two semicircular bases, so that the position is considered to be correct. If not two semicircular bases are used, but other shapes such as square, the square bases are not completely attached to the inner wall of the cylinder, so that the relative positioning is difficult.
4. Design principle of two semicircle bases. The measuring device has certain requirements on precision. Because the inner wall cylinder is round, the supporting seat is round, when the height is adjusted, the relative height can be adjusted due to the fact that the inner wall cylinder is tightly attached to the supporting seat, and the accuracy is about 1 mm.
5. Any point test principle.
Axial arbitrary point test: because adjustable bracing piece and both ends supporting seat are through the spring card gently on the inner wall of section of thick bamboo and can follow the axial arbitrary removal of section of thick bamboo, hall test head installs simultaneously on the adjustable bracing piece and also follows the removal together, can realize axial arbitrary one point test from this.
Testing at any circumferential point: because adjustable bracing piece and both ends supporting seat pass through the spring gently block on the inner wall of section of thick bamboo and can rotate wantonly along the circumference of section of thick bamboo, hall test head installs simultaneously on the adjustable bracing piece and also rotates along with the same time, can realize the test of arbitrary one point in circumference from this.
Radial arbitrary point test: the Hall test head can reciprocate along the adjustable support rod, and the adjustable support rod is always parallel to the diameter direction of the cylinder, so that the measuring device can test at any point along the radial direction.
Based on the principle of the invention, the invention designs a magnetic shielding magnetic field measuring device of a cyclotron. The magnetic shielding magnetic field measuring device of the cyclotron is shown in fig. 1, and comprises a supporting seat 1, a Hall probe bracket 3 and an adjustable supporting rod 2; the supporting seat 1 comprises a semicircular base and a top seat which are respectively arranged at two ends of the adjustable supporting rod 2 and form a plane with the adjustable supporting rod, and the length between the adjustable supporting rod 2 and the highest point of the semicircular bases at the two ends is matched with the diameter of the magnetic shielding cylinder to be measured; the plane of the Hall probe bracket 3 vertically passes through the adjustable support rod 2 and moves along the axial direction of the adjustable support rod 2 between the base and the top seat or the radial direction of the magnetic shielding barrel; the magnetic shielding magnetic field measuring device can do linear motion along the axial direction of the magnetic shielding cylinder, can do circumferential motion along the axial direction of the magnetic shielding cylinder, can also achieve radial motion along the radius of the magnetic shielding cylinder, and achieves magnetic field measurement at multiple points and different positions in the magnetic shielding cylinder.
The circular arc on the outer circle radius R of base and footstock cooperatees with the circular arc on the inner circle radius R of magnetic shielding section of thick bamboo, the inboard and the adjustable bracing piece of base and footstock are connected, and its connecting hole adopts similar C keyway quick detach to connect, and convenient connection promptly can prevent its rotation again.
The adjustable supporting rod comprises a guide rod, an adjustable nut, a spring and a top rod; the lower part of the guide rod is internally provided with a spring, the lower part of the spring is internally provided with a push rod, the lower end of the push rod is connected with an adjustable nut, and the external thread of the adjustable nut is connected with the internal thread of the guide rod; the compression amount of the spring is changed by adjusting the adjustable nut, so that the length change of the adjustable supporting rod is realized, and the magnetic field measurement of magnetic shielding barrels with different diameters is realized.
The Hall probe bracket comprises a guide block, a pressing plate and a butterfly lock nut; the outline of the guide block is a flat rectangle, the upper surface and the lower surface of the flat rectangle close to the two ends in the length direction respectively penetrate through a round hole, and the diameters of the two round holes are respectively matched with the diameter of the cylinder of the adjustable support rod; the center of the upper surface of the guide block penetrates through the front and rear surfaces of the guide block and is downwards provided with three stepped layers of grooves, stepped three layers of square holes are formed in the side surface of the guide block, the Hall probe can be fixed in different square holes, magnetic field measurement in three different directions of XYZ can be achieved, and magnetic field measurement in different positions of the magnetic shielding barrel along the radial direction can be achieved by adjusting the relative positions of the guide block and the guide rod.
The guide block is characterized in that the front and rear of the guide block is penetrated by a stepped three-layer groove, the uppermost layer groove is used for placing a pressing plate, the middle layer groove is used for arranging a Hall probe in the Z-axis direction, the lower layer groove and the other groove on the same plane form a cross groove in a cross manner, and the two grooves of the cross groove are respectively provided with the Hall probe in the X-axis direction and the Hall probe in the Y-axis direction.
The pressing plate is used for fixing the Hall probe, and the butterfly lock nut is used for fixing the position of the guide block relative to the guide rod.
All materials of the measuring device are made of non-ferrous materials which are non-magnetic, and the measuring device comprises materials for manufacturing a supporting seat, a Hall probe bracket and an adjustable supporting rod, and is made of aluminum or nylon, so that the measuring device can move in the magnetic shielding barrel due to non-magnetic conduction.
The total length between the semicircular highest points of the bases at the two ends of the adjustable supporting rod is 3-5 mm larger than the diameter of the magnetic shielding cylinder, and the measuring device with the total length being 3-5 mm larger than the diameter of the magnetic shielding cylinder can be installed in the magnetic shielding cylinder through the compression spring due to the fact that the spring of the adjustable supporting rod of the measuring device is compressible, so that the clamping and positioning effects are achieved.
The brown length of base and footstock cooperatees with magnetic shielding section of thick bamboo test hole length, the thickness of base and footstock cooperatees with magnetic shielding section of thick bamboo test hole width.
Example 1
Firstly, an adjustable nut is adjusted according to the diameter of the inner magnetic shielding cylinder, so that the outer circle of a supporting seat of the magnetic shielding magnetic field measuring device is matched with the inner circle of the magnetic shielding cylinder.
Axial movement: the Hall probe is fixed on a rectangular hole 1 (or a rectangular hole 2 and a rectangular hole 3) of the guide block through the pressing plate, meanwhile, the guide block is fixed on the guide rod, and the upper base and the lower base of the support seat respectively support the inner circle of the magnetic shielding cylinder. The whole magnetic shielding magnetic field measuring device moves linearly along the axial direction of the magnetic shielding barrel (as shown in figure 6).
Example 2
Circumferential movement: the Hall probe is fixed on a rectangular hole 1 (or a rectangular hole 2 and a rectangular hole 3) of the guide block through the pressing plate, meanwhile, the guide block is fixed on the guide rod, and the upper base and the lower base of the support seat respectively support the inner circle of the magnetic shielding cylinder. The whole magnetic shielding magnetic field measuring device is subjected to circumferential rotation motion along the central axis of the magnetic shielding barrel (as shown in fig. 7).
Example 3
Radial movement: the Hall probe is fixed on a rectangular hole 1 (or a rectangular hole 2 and a rectangular hole 3) of the guide block through the pressing plate, the whole magnetic shielding magnetic field measuring device is placed at a certain position of the magnetic shielding cylinder, and meanwhile, the guide block is subjected to radial linear motion along the guide rod (as shown in fig. 8).
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A magnetic shielding magnetic field measuring device of a cyclotron, characterized in that: the device comprises a supporting seat, a Hall probe bracket and an adjustable supporting rod; the support seat comprises a semicircular base and a top seat which are respectively arranged at two ends of the adjustable support rod and form a plane with the adjustable support rod, and the length between the adjustable support rod and the highest point of the semicircular bases at the two ends is matched with the diameter of the magnetic shielding cylinder to be measured; the Hall probe bracket plane vertically passes through the adjustable support rod and moves along the axial direction of the adjustable support rod between the base and the top seat or the radial direction of the magnetic shielding barrel; the magnetic shielding magnetic field measuring device can do linear motion along the axial direction of the magnetic shielding cylinder, can do circumferential motion along the axial direction of the magnetic shielding cylinder, can also achieve radial motion along the radius of the magnetic shielding cylinder, and achieves magnetic field measurement at multiple points and different positions in the magnetic shielding cylinder;
the inner sides of the base and the top seat are connected with the adjustable supporting rod, and the connecting holes are connected in a C-shaped key groove-like quick-dismantling mode;
The adjustable supporting rod comprises a guide rod, an adjustable nut, a spring and a top rod; the lower part of the guide rod is internally provided with a spring, the lower part of the spring is internally provided with a push rod, the lower end of the push rod is connected with an adjustable nut, and the external thread of the adjustable nut is connected with the internal thread of the guide rod; the compression amount of the spring is changed by adjusting the adjustable nut, so that the length change of the adjustable supporting rod is realized, and the magnetic field measurement of magnetic shielding barrels with different diameters is realized.
2. The cyclotron magnetic shielding magnetic field measurement device of claim 1, wherein: the Hall probe bracket comprises a guide block, a pressing plate and a butterfly lock nut; the outline of the guide block is a flat rectangle, the upper surface and the lower surface of the flat rectangle close to the two ends in the length direction respectively penetrate through a round hole, and the diameters of the two round holes are respectively matched with the diameter of the cylinder of the adjustable support rod; the center of the upper surface of the guide block penetrates through the front and rear surfaces of the guide block and is downwards provided with three stepped layers of grooves, stepped three layers of square holes are formed in the side surface of the guide block, the Hall probe can be fixed in different square holes, magnetic field measurement in three different directions of XYZ can be achieved, and magnetic field measurement in different positions of the magnetic shielding barrel along the radial direction can be achieved by adjusting the relative positions of the guide block and the guide rod.
3. A cyclotron magnetic shield magnetic field measurement device according to claim 2, characterized in that: the guide block is characterized in that the front and rear of the guide block is penetrated by a stepped three-layer groove, the uppermost layer groove is used for placing a pressing plate, the middle layer groove is used for arranging a Hall probe in the Z-axis direction, the lower layer groove and the other groove on the same plane form a cross groove in a cross manner, and the two grooves of the cross groove are respectively provided with the Hall probe in the X-axis direction and the Hall probe in the Y-axis direction.
4. A cyclotron magnetic shield magnetic field measurement device according to claim 2, characterized in that: the pressing plate is used for fixing the Hall probe, and the butterfly lock nut is used for fixing the position of the guide block relative to the guide rod.
5. The cyclotron magnetic shielding magnetic field measurement device of claim 1, wherein: all materials of the measuring device are made of non-ferrous materials which are non-magnetic, so that the measuring device can move in the magnetic shielding barrel due to non-magnetic conduction.
6. The cyclotron magnetic shielding magnetic field measurement device of claim 1, wherein: the total length between the semicircular highest points of the bases at the two ends of the adjustable supporting rod is 3-5 mm larger than the diameter of the magnetic shielding cylinder, and the measuring device with the total length being 3-5 mm larger than the diameter of the magnetic shielding cylinder can be installed in the magnetic shielding cylinder through the compression spring due to the fact that the spring of the adjustable supporting rod of the measuring device is compressible, so that the clamping and positioning effects are achieved.
7. The cyclotron magnetic shielding magnetic field measurement device of claim 1, wherein: the brown length of base and footstock cooperatees with magnetic shielding section of thick bamboo test hole length, the thickness of base and footstock cooperatees with magnetic shielding section of thick bamboo test hole width.
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