CN110753438B - Beam line magnet shielding device and shielding method - Google Patents
Beam line magnet shielding device and shielding method Download PDFInfo
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- CN110753438B CN110753438B CN201911062405.7A CN201911062405A CN110753438B CN 110753438 B CN110753438 B CN 110753438B CN 201911062405 A CN201911062405 A CN 201911062405A CN 110753438 B CN110753438 B CN 110753438B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/001—Arrangements for beam delivery or irradiation
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H13/00—Magnetic resonance accelerators; Cyclotrons
- H05H13/005—Cyclotrons
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
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- H—ELECTRICITY
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
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Abstract
The invention discloses a beam line magnet shielding device, which is symmetrically arranged at two sides of an accelerator beam line magnet assembly; each side magnet shielding device comprises a slotted thin plate made of pure iron materials, transverse plates at the upper end and the lower end of the slotted thin plate, reinforcing ribs on the transverse plates at the upper end and the lower end, and connecting plates between the reinforcing ribs at the upper end and the lower end and the magnets, wherein a plurality of strip-shaped gaps are longitudinally formed in the slotted thin plate; when the beam line magnet shielding device meets the set requirement that the magnetic shielding effect meets the bearable requirement, the beam line magnet shielding device also meets the requirements of temperature value setting and mechanical strength setting; also disclosed is a method: designing the thickness of a shielding plate according to a magnetic shielding setting threshold value, and designing slotting entries, lengths and intervals of the plate according to a temperature setting threshold value; and measuring the rigidity of the shielding plate, and laying reinforcing ribs if the rigidity is not enough. The invention effectively shields the magnetic field leaked by the beam line magnet and reduces the eddy current generated by the magnetic field on the beam line magnet magnetic shielding plate.
Description
Technical Field
The invention belongs to the technical field of accelerators, and particularly relates to a beam line magnet shielding device and a shielding method.
Background
The magnetic field intensity in the central area of the superconducting cyclotron reaches about 2-3T, and the leakage magnetic field near the main magnet can be about 500 Gs-2000 Gs. The leakage magnetic field affects the operation of components around the accelerator, for example, moving components such as a molecular pump, a cryopump, a vacuum valve and the like are affected by the leakage magnetic field, and the working magnetic field environment intensity of the conventional molecular pump, the conventional cryopump and the like is required to be lower than 50 Gs.
Aiming at the problem that the normal use of an accelerator element near a beam streamline magnet is influenced by the outward expansion of the magnetic line of the current beam streamline magnet, the prior art adopts a method of additionally arranging a magnetic field shielding plate made of pure iron around the main magnet of the accelerator, although the method is feasible, the magnetic field shielding can never be effective by a single parameter, but various parameters are mutually involved and restricted, for example, if the problem of magnetic field leakage is solved only by a method of thickening the magnetic shielding plate, although the problem of magnetic leakage is solved, a lot of side effects can be brought: when the thickness of the magnetic shielding plate is larger, the eddy current generated in the magnetic shielding iron plate is too large, so that the temperature is increased, and surrounding components are damaged due to heating exceeding the rated value, so that the problem of magnetic leakage is solved, but a new problem is generated; if the thickness of the magnetic shielding plate is reduced in order to reduce the eddy current, the eddy current problem is solved, but the magnetic field shielding effect is influenced because the plate is too thin; when the thickness of the plate is no longer reduced in order to guarantee the magnetic shielding effect, other methods are used to reduce the eddy currents, such as: when a certain number of gaps are formed in the magnetic shielding plate to reduce eddy currents, when the number of the gaps is too small, the eddy currents cannot be reduced, and when the number of the gaps is too large, for example, when gaps are almost not spaced in extreme cases, the magnetic shielding effect is still influenced; when the plate is ensured not to be too thick and the number of the slots is ensured not to be too small, the mechanical strength of the slotted thin plate is problematic, and due to the influence of the strong magnetic field, although the slot direction is parallel to the magnetic line direction, the magnetic field force is relatively thin and acts on the slotted thin plate for a long time, so that the magnetic shielding plate is deformed along the magnetic line direction.
To sum up, the prior art solves the problem of magnetic shielding, solves the problem of eddy current and mechanical strength, finds out a balance point of the eddy current, the mechanical strength and the three, and does not find out the balance point at present.
Disclosure of Invention
The invention provides a beam line magnet shielding device and a shielding method aiming at overcoming the defects of the prior art, and aims to solve the problem that the prior art cannot meet set requirements in three aspects of magnetic shielding, eddy current and mechanical strength simultaneously so that the requirements are lost.
The invention adopts the following technical scheme for solving the technical problems:
the utility model provides a beam line magnet shield assembly, this magnet shield assembly symmetry lays in accelerator beam line magnet subassembly both sides: one side of the accelerator beam inlet corresponds to the accelerator beam outlet, and the other side of the accelerator beam outlet corresponds to the accelerator beam inlet; each side magnet shielding device comprises a slotted thin plate made of pure iron materials, transverse plates at the upper end and the lower end of the slotted thin plate, reinforcing ribs on the transverse plates at the upper end and the lower end, and connecting plates between the reinforcing ribs at the upper end and the lower end and the magnets, wherein a plurality of strip-shaped gaps are longitudinally formed in the slotted thin plate; the method is characterized in that: when the beam line magnet shielding device meets the set bearable requirement of magnetic shielding effect, the slit cooling temperature value of the thin plate also meets the set bearable requirement, and the mechanical strength of the thin plate also meets the set bearable requirement.
The magnetic shielding effect meets the bearable set requirement, namely the thickness of the slotted sheet ensures that the magnetic leakage field is less than 50 gauss when the beam line magnet coil is electrified; the slotting cooling temperature value meets the bearable set requirement, namely a plurality of strip-shaped slots longitudinally formed in the slotted thin plate ensure that the temperature of the slotted thin plate is less than 50 ℃ when the beam line magnet coil is electrified, and the number of the slots is the minimum number of the strip slots when the temperature of the slotted thin plate is less than 50 ℃; the mechanical strength of the slotted sheet reaches the bearable set requirement, namely, the reinforcing ribs at the upper end and the lower end of the magnet shielding device ensure the mechanical strength of the slotted sheet, and the amplitude of the slotted sheet is less than 0.1mm when the beam line magnet coil is electrified.
The magnet shielding plates are symmetrically arranged on two sides of the accelerator beam line magnet assembly, each side of the magnet shielding plate is divided into an upper part and a lower part, the upper part and the lower part are respectively arranged on an inlet vacuum pipeline of an inlet of an accelerator vacuum chamber vertical to the beam direction, and the upper part and the lower part are arranged on an outlet vacuum pipeline of an outlet of the accelerator vacuum chamber and an outlet collimation vacuum pipeline; the direction of a plurality of strip seams longitudinally arranged on the magnetic shielding plate is parallel to the direction of magnetic lines of force; the direction of the connecting line of the two ends of the upper end reinforcing rib and the lower end reinforcing rib of the magnetic shielding plate is the direction of the magnetic force line.
The thickness of the magnetic shielding plate is 5mm, and the electric pure iron DT4 is used as a magnetic shielding material; the number of a plurality of longitudinal slits arranged on the magnetic shielding plate is 20, the width of each slit is 1mm, the length of each slit is 50mm, and the distance between the slits is 10 mm; because the thickness of the magnetic shielding plate is thin, 6 reinforcing ribs are uniformly welded between the magnetic shielding plate and the accelerator beam linear magnet in order to ensure the mechanical strength of the magnetic shielding plate.
A beam line magnet shielding method of a beam line magnet shielding device is characterized in that: the determination of the structure of the slotted sheet comprises the following steps:
step one, setting the thickness of a slotted sheet;
step two, energizing and exciting the magnet coil;
measuring an external magnetic field of the slotted sheet;
the external magnetic field is the magnetic field of the slotted thin plate on the side far away from the magnetic field of the magnet, but not the magnetic field on the side opposite to the magnetic field of the magnet.
Step four, detecting whether the magnetic field of the slotted sheet is less than 50 gauss, if not, increasing the thickness of the sheet, and then returning to the step three; if yes, turning to the step five;
measuring the temperature of the slotted sheet;
step six, judging whether the temperature of the slotted thin plate is less than 50 ℃, if not, increasing the number of the slots, and if so, turning to the step nine;
step seven, measuring the external magnetic field of the slotted sheet again after increasing the number of the slots;
step eight, judging whether the magnetic field of the slotted thin plate is smaller than 50 gauss, if not, reducing the number of the slots, and if so, turning to the step nine;
step nine, measuring the rigidity of the slotted sheet;
step ten, judging whether the amplitude of the slotted thin plate is smaller than 0.1mm, if not, increasing the number of reinforcing ribs, then returning to the step nine, and if so, turning to the step eleven;
step eleven: the slotted sheet is designed according to the structure.
Advantageous effects of the invention
1. According to the invention, the thickness of the magnetic shielding plate is designed to be 5mm, 20 slits are longitudinally formed in the magnetic shielding plate, the width of each slit is 1mm, the length of each slit is 50mm, the gap distance is 10mm, and 6 reinforcing ribs are uniformly distributed and welded between the magnetic shielding plate and the accelerator beam linear magnet, so that the benefits of magnetic shielding, temperature value and mechanical strength are taken into consideration, the optimal effect of combination of the three is achieved, all parts are mutually supported and interdependent after combination, and the technical problem that the prior art cannot meet set requirements in three aspects of magnetic shielding, eddy current and mechanical strength simultaneously, so that the magnetic shielding plate is lost is solved.
2. The invention effectively shields the magnetic field leaked by the beam linear magnet and ensures the normal use of the accelerator element near the beam linear magnet; eddy current generated by a magnetic field on the beam line magnet magnetic shielding plate is effectively reduced, and the problem of overhigh temperature when the magnetic shielding plate is used is solved; simple structure, the commonality is strong.
Drawings
FIG. 1 is a view showing the structure of a beam line magnet shielding apparatus according to the present invention;
FIG. 2 is a perspective view showing the application effect of the beam line magnet shielding device according to the present invention;
FIG. 3 is a front view of the application effect of the beam line magnet shielding device of the present invention;
FIG. 4 is a magnetic shielding effect diagram of the beam line magnet shielding device according to the present invention;
FIG. 5 is a schematic view of the direction of beam motion in the accelerator beam line magnet assembly;
FIG. 6 is a flow chart of a method for shielding a beam line magnet according to the present invention;
in the figure:
1: an accelerator beam line magnet assembly; 2: accelerator beam line magnets; 21: a magnetic pole; 22: a hoisting ring; 23: a target; 24: a connecting member; 25: a magnetic yoke; 26: a coil; 27: reinforcing ribs; 28: a magnetic shield panel; 28-1: slotting the thin plate; 28-2: a transverse plate; 28-3: reinforcing ribs; 28-4: a connecting plate; 28-5: a gap; 31: vacuum chamber outlet vacuum line, 32: vacuum chamber collimated vacuum tube, 33: a vacuum chamber inlet vacuum conduit; 4: an adjustable support; 5: the theoretical moving direction of the beam when the coil is electrified; 6: and the theoretical moving direction of the beam current when the coil is not electrified.
Detailed Description
Design principle of the invention
1. The three are combined with the design principle. Firstly, because the benefits of magnetic shielding, temperature and mechanical strength are considered, the invention is not suitable for being designed to be optimal in one of the three aspects, but the combination of the three aspects is optimal. For example, the magnetic field shielding value, or the temperature value, cannot be limited to 0 hertz or 0 degrees celsius, since, considering only one, the other two must be affected; secondly, the conflict between the plate thickness and the eddy currents must be resolved first, since the eddy currents are only related to the plate thickness, and although the plate thickness also affects the mechanical strength, the mechanical strength is the first solution to the eddy currents, which results in the first step: the thinnest plate thickness is found under the condition that the magnetic shielding setting threshold is met.
2. The thickness of the magnetic shielding plate, the eddy current and the mechanical strength are contradictory. A. Contradiction between the thickness of the shielding plate and the mechanical strength: the size of the shielding plate cannot be too thick, and the too thick shielding plate can generate larger eddy current so as to increase the temperature; the mechanical strength cannot be affected by too thin and too thin magnetic lines, because the magnetic lines of force are perpendicular to the side ends of the thin plate, the thin plate is deformed under the action of magnetic force for a long time, and although the problem of mechanical strength can be relieved by adopting the reinforcing ribs, the effect of the reinforcing ribs is limited, so that the problem of mechanical strength can be solved only by combining the thickness of the shielding plate with the reinforcing ribs. B. Contradiction between shield plate thickness and eddy currents: the shield plate must not be too thin, which would affect the mechanical strength, but not too thin, which would create large eddy currents and cause temperature increases.
3. The design principle of the thickness of the magnetic shielding plate. A. According to the tolerance degree of components around the main magnetic pole of the cyclotron to a magnetic field, a magnetic shielding threshold value is set, the thickness of the plate is gradually increased from small to large according to the threshold value until the magnetic shielding threshold value is set, the thickness of the plate is the sustainable upper limit thickness, namely the thinnest thickness, and the problems of the generated eddy current and the mechanical strength are solved by adopting other methods because the thickness of the plate reaches the threshold value and cannot be reduced any more.
4. The sheet slit is contradictory to the mechanical strength and magnetic shielding. Too many slits affect the mechanical strength and also the magnetic shielding effect, and too few slits do not reduce the temperature. Therefore, the relation among the mechanical strength, the temperature and the magnetic shielding is comprehensively considered in the number, the length and the interval of the slits.
5. The design principle of the sheet slot. A. Setting a temperature threshold according to the tolerance degree of components around the main magnetic pole of the cyclotron to a magnetic field, and gradually increasing the plate slot from few to many according to the threshold; B. the slotting gives consideration to the change of the magnetic shielding effect. Experiments prove that the adjusted magnetic shielding effect cannot be changed in a certain range by the thin plate slotting, for example, the set value of 50 Hz, after the magnetic shielding effect reaches the set value, the magnetic shielding value cannot be changed in a certain range by the thin plate slotting, but when the thin plate slotting exceeds the certain range, for example, when the gap between the strip seams is almost zero under an extreme condition, the magnetic shielding effect is influenced, and therefore, the number, the interval and the length of the strip seams are determined while the set value of the magnetic shielding and the set value of the temperature are simultaneously considered to be adjusted. C. When the temperature of the plate after the slits reaches the threshold value and the magnetic shielding effect also reaches the threshold value, the number, the length and the interval of the slits are fixed at the moment, because the number, the length and the interval of the slits can influence the two threshold values if changed. And after the thickness, the number, the length and the interval of the slots of the plate are fixed, testing the rigidity of the plate, and if the rigidity is in a problem, solving the problem only by other methods.
6. The design principle of the reinforcing rib. If the strength of the reinforcing rib is too large, the reinforcing rib is wasted, and if the strength of the reinforcing rib is too small, the reinforcing rib does not work, and if a proper strength is to be found, the reinforcing rib of the board must be designed on the premise that the size of the board meets the requirements of the first two threshold values.
Based on the principle, the invention designs a beam line magnet shielding device.
A beam line magnet shield is shown in fig. 1-5, symmetrically arranged on both sides of an accelerator beam line magnet assembly: one side of the accelerator beam inlet corresponds to the accelerator beam outlet, and the other side of the accelerator beam outlet corresponds to the accelerator beam inlet; each side magnet shielding device comprises a slotted thin plate 28-1 made of pure iron material, transverse plates 28-2 at the upper and lower ends of the slotted thin plate, reinforcing ribs 28-3 on the transverse plates at the upper and lower ends, and a connecting plate 28-4 between the reinforcing ribs at the upper and lower ends and the magnet, wherein a plurality of strip-shaped gaps are longitudinally formed in the slotted thin plate; the method is characterized in that: when the beam line magnet shielding device meets the set bearable requirement of magnetic shielding effect, the slit cooling temperature value of the thin plate meets the set bearable requirement, and the mechanical strength of the slit thin plate meets the set bearable requirement.
The magnetic shielding effect meets the bearable set requirement, namely the thickness of the slotted sheet ensures that the magnetic leakage field is less than 50 gauss when the beam line magnet coil is electrified; the slotting cooling temperature value meets the bearable set requirement, namely a plurality of strip-shaped slots longitudinally formed in the slotted thin plate ensure that the temperature of the slotted thin plate is less than 50 ℃ when the beam line magnet coil is electrified, and the number of the slots is the minimum number of the strip slots when the temperature of the slotted thin plate is less than 50 ℃; the mechanical strength of the slotted sheet reaches the bearable set requirement, namely, the reinforcing ribs at the upper end and the lower end of the magnet shielding device ensure the mechanical strength of the slotted sheet, and the amplitude of the slotted sheet is less than 0.1mm when the beam line magnet coil is electrified.
As shown in fig. 2-3, the magnet shield plates symmetrically arranged on both sides of the accelerator beam line magnet assembly are divided into an upper part and a lower part, respectively arranged above and below an inlet vacuum pipe 33 of an inlet of the accelerator vacuum chamber perpendicular to the beam direction, and arranged above and below an outlet vacuum pipe 31 and an outlet collimation vacuum pipe 32 of an outlet of the accelerator vacuum chamber; as shown in fig. 1, a plurality of slits 28-5 longitudinally formed in the magnetic shield panel are parallel to the direction of the magnetic force lines; the direction of the connecting line of the two ends of the upper end reinforcing rib and the lower end reinforcing rib of the magnetic shielding plate is the direction of the magnetic force line.
The thickness of the magnetic shielding plate is 5mm, and the electric pure iron DT4 is used as a magnetic shielding material; the number of a plurality of longitudinal slits arranged on the magnetic shielding plate is 20, the width of each slit is 1mm, the length of each slit is 50mm, and the distance between the slits is 10 mm; because the thickness of the magnetic shielding plate is thin, 6 reinforcing ribs are uniformly welded between the magnetic shielding plate and the accelerator beam linear magnet in order to ensure the mechanical strength of the magnetic shielding plate.
A beam line magnet shielding method of a beam line magnet shielding device is characterized in that: the determination of the structure of the slotted sheet comprises the following steps:
step one, setting the thickness of a slotted sheet;
step two, energizing and exciting the magnet coil;
measuring an external magnetic field of the slotted sheet;
the external magnetic field is the magnetic field of the slotted thin plate on the side far away from the magnetic field of the magnet, but not the magnetic field on the side opposite to the magnetic field of the magnet.
Step four, detecting whether the magnetic field of the slotted sheet is less than 50 gauss, if not, increasing the thickness of the sheet, and then returning to the step three; if yes, turning to the step five;
measuring the temperature of the slotted sheet;
step six, judging whether the temperature of the slotted thin plate is less than 50 ℃, if not, increasing the number of the slots, and if so, turning to the step nine;
step seven, measuring the external magnetic field of the slotted sheet again after increasing the number of the slots;
step eight, judging whether the magnetic field of the slotted thin plate is smaller than 50 gauss, if not, reducing the number of the slots, and if so, turning to the step nine;
step nine, measuring the rigidity of the slotted sheet;
step ten, judging whether the amplitude of the slotted thin plate is smaller than 0.1mm, if not, increasing the number of reinforcing ribs, then returning to the step nine, and if so, turning to the step eleven;
step eleven: the slotted sheet is designed according to the structure.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. The utility model provides a beam line magnet shield assembly, this magnet shield assembly symmetry lays in accelerator beam line magnet subassembly both sides: one side of the accelerator beam inlet corresponds to the accelerator beam outlet, and the other side of the accelerator beam outlet corresponds to the accelerator beam inlet; each side magnet shielding device comprises a slotted thin plate made of pure iron materials, transverse plates at the upper end and the lower end of the slotted thin plate, reinforcing ribs on the transverse plates at the upper end and the lower end, and connecting plates between the reinforcing ribs at the upper end and the lower end and the magnets, wherein a plurality of strip-shaped gaps are longitudinally formed in the slotted thin plate; the method is characterized in that: when the beam line magnet shielding device meets the requirement that the magnetic shielding effect meets the bearable set requirement, the slit cooling temperature value of the thin plate meets the bearable set requirement, and the mechanical strength of the thin plate meets the bearable set requirement;
the magnetic shielding effect meets the bearable set requirement, namely the thickness of the slotted sheet ensures that the magnetic leakage field is less than 50 gauss when the beam line magnet coil is electrified; the slotting cooling temperature value meets the bearable set requirement, namely a plurality of strip-shaped slots longitudinally formed in the slotted thin plate ensure that the temperature of the slotted thin plate is less than 50 ℃ when the beam line magnet coil is electrified, and the number of the slots is the minimum number of the strip slots when the temperature of the slotted thin plate is less than 50 ℃; the mechanical strength of the slotted sheet reaches the bearable set requirement, namely, reinforcing ribs at the upper end and the lower end of the magnet shielding device ensure the mechanical strength of the slotted sheet, and the amplitude of the slotted sheet is less than 0.1mm when the beam line magnet coil is electrified;
the thickness of the magnetic shielding plate is 5mm, and the electric pure iron DT4 is used as a magnetic shielding material; the number of a plurality of longitudinal slits arranged on the magnetic shielding plate is 20, the width of each slit is 1mm, the length of each slit is 50mm, and the distance between the slits is 10 mm; because the thickness of the magnetic shielding plate is thin, 6 reinforcing ribs are uniformly welded between the magnetic shielding plate and the accelerator beam linear magnet in order to ensure the mechanical strength of the magnetic shielding plate.
2. The beam line magnet shielding device according to claim 1, wherein: the magnet shielding plates are symmetrically arranged on two sides of the accelerator beam line magnet assembly, each side of the magnet shielding plate is divided into an upper part and a lower part, the upper part and the lower part are respectively arranged on an inlet vacuum pipeline of an inlet of an accelerator vacuum chamber vertical to the beam direction, and the upper part and the lower part are arranged on an outlet vacuum pipeline of an outlet of the accelerator vacuum chamber and an outlet collimation vacuum pipeline; the direction of a plurality of strip seams longitudinally arranged on the magnetic shielding plate is parallel to the direction of magnetic lines of force; the direction of the connecting line of the two ends of the upper end reinforcing rib and the lower end reinforcing rib of the magnetic shielding plate is the direction of the magnetic force line.
3. A beam line magnet shielding method based on the beam line magnet shielding apparatus of any one of claims 1 to 2, characterized in that: the determination of the structure of the slotted sheet comprises the following steps:
step one, setting the thickness of a slotted sheet;
step two, energizing and exciting the magnet coil;
measuring an external magnetic field of the slotted sheet;
the external magnetic field is a magnetic field at one side of the slotted thin plate, which is far away from the magnetic field of the magnet, but not a magnetic field at one side opposite to the magnetic field of the magnet;
step four, detecting whether the magnetic field of the slotted sheet is less than 50 gauss, if not, increasing the thickness of the sheet, and then returning to the step three; if yes, turning to the step five;
measuring the temperature of the slotted sheet;
step six, judging whether the temperature of the slotted thin plate is less than 50 ℃, if not, increasing the number of the slots, and if so, turning to the step nine;
step seven, measuring the external magnetic field of the slotted sheet again after increasing the number of the slots;
step eight, judging whether the magnetic field of the slotted thin plate is smaller than 50 gauss, if not, reducing the number of the slots, and if so, turning to the step nine;
the slotting gives consideration to the change of the magnetic shielding effect at the same time, namely the slotting of the thin plate does not change the adjusted magnetic shielding effect within a certain range, but the magnetic shielding effect is influenced when the slotting of the thin plate exceeds the certain range; therefore, the number, the interval and the length of the slits are determined, and the adjustment is carried out while considering the magnetic shielding set value and the temperature set value.
Step nine, measuring the rigidity of the slotted sheet;
step ten, judging whether the amplitude of the slotted thin plate is smaller than 0.1mm, if not, increasing the number of reinforcing ribs, then returning to the step nine, and if so, turning to the step eleven;
step eleven: the slotted sheet is designed according to the structure.
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