CN113421688B - Quadrupole lens assembly with magnetic pole positioning ring and method for installing the positioning ring - Google Patents
Quadrupole lens assembly with magnetic pole positioning ring and method for installing the positioning ring Download PDFInfo
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- G—PHYSICS
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- G21K1/093—Deviation, concentration or focusing of the beam by electric or magnetic means by magnetic means
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
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Abstract
The invention discloses a quadrupole lens assembly with magnetic pole positioning rings and a mounting method of the positioning rings, wherein the assembly comprises four magnetic poles which are arranged close to a small radius and uniformly spaced in the circumferential direction by 90 degrees, and magnetic yokes which encircle the outer sides of the four magnetic poles, the axial front end surface and the axial rear end surface of the quadrupole lens assembly are respectively provided with a first-stage magnetic pole positioning mechanism and a second-stage magnetic pole positioning mechanism, the first-stage magnetic pole positioning mechanism is a left and right two joint pins which are arranged at the joint of an upper half quadrupole lens and a lower half quadrupole lens, the second-stage magnetic pole positioning mechanism is a magnetic pole positioning ring which encircles and connects the four magnetic poles at the small radius of the quadrupole lens, and the method comprises the following steps: before the positioning pin holes are matched, measuring a magnetic field and determining the relative position; and matching positioning pin holes of the outer ring and the inner ring of each group of quadrupole lenses, disassembling the quadrupole lenses before installing the beam pipeline, and resetting and assembling N quadrupole lens assemblies by adopting pins after installing the beam pipeline. The invention improves the magnetic field uniformity error from three thousandths to five parts per million.
Description
Technical Field
The invention belongs to the technical field of accelerators, and particularly relates to a quadrupole lens assembly with a magnetic pole positioning ring and a positioning ring mounting method.
Background
The accelerator is a special electric, magnetic and high-vacuum device which can make charged particles in high-vacuum field be controlled by magnetic field force and accelerated by electric field force so as to attain high energy, and is a modern equipment for artificially providing various high-energy particle beams or radiation rays, and is an important instrument in high-energy physics.
The beam line is an important component of the accelerator, and the beam current led out of the accelerator is transmitted to each experimental terminal through the beam line.
The quadrupole lenses are the main beam line magnets on the beam line, the beam line is usually formed by connecting a plurality of groups of quadrupole lenses in series, and the center of each group of quadrupole lenses is a beam current pore canal. When energized, the magnetic field produced by the quadrupole lens imparts a focusing force to the particles so that the beam passing therethrough avoids deviating from the central orbit. In the prior art, for the technical scheme of the quadrupole lens, for example, the installation collimation device and the installation collimation method of the quadrupole lens on the proton beam line of the patent CN2867584Y magnetic quadrupole lens and the patent CN108735328A magnetic pole are only related to the structure of the quadrupole lens, but not related to how to solve the problem of accurately positioning the magnetic pole on the quadrupole lens, because the accurate positioning of the magnetic pole of the quadrupole lens is difficult to achieve.
The reason why the precise positioning of the quadrupole lens poles is difficult is that: the positioning between the magnetic poles adopts a lifting positioning method, before lifting positioning, the two magnetic poles of the lower quadrupole lens and the two magnetic poles of the upper quadrupole lens are respectively installed, and then the upper quadrupole lens and the lower quadrupole lens are assembled. Before assembly, semicircular holes for installing the joint pins are formed in the left side and the right side of the upper half quadrupole lens magnetic yoke and the left side and the right side of the lower half quadrupole lens magnetic yoke respectively, and the joint pins are arranged in the semicircular holes, and at the moment, the length direction of the joint pins is perpendicular to the transverse section direction of the quadrupole lenses. During assembly, as the lifting positioning is soft positioning, the upper half quadrupole lens can shake back and forth and left and right in the lifting process, and when the upper half quadrupole lens shakes left and right, if the diameter of the top of the joint pin is too small, the joint pin can be rolled and deformed by the quadrupole lens when the quadrupole lens shakes left and right. Based on this, the diameter of the pin used for positioning the quadrupole lens in engineering cannot be too thin, but must be relatively thick, and the diameter of the pin cannot be smaller than 0.8 mm, and the positioning accuracy can only reach 0.1 mm.
The poles of the quadrupole lens are difficult to position precisely, and the poles appearing at both ends of the quadrupole lens cannot ensure strict coaxiality and strict concentricity. The fact that strict coaxiality cannot be guaranteed means that the connecting lines of the two ends of each magnetic pole are not parallel to the axis of the quadrupole lens, but have a certain angle; the fact that strict concentricity cannot be guaranteed means that two magnetic poles of the upper quadrupole lens and two magnetic poles of the lower quadrupole lens are misplaced left and right, so that four magnetic poles cannot be concentric; when the non-concentricity or the non-coaxiality of the magnetic poles of the quadrupole lens is more than or equal to 0.1 millimeter, the deviation of the beam current is amplified by 25 times (which is calculated by strict beam flow mechanics), and meanwhile, the error of measuring the magnetic field uniformity can only reach three thousandths, but the requirement that the error of the magnetic field uniformity is less than five parts per million is not met.
Disclosure of Invention
The invention provides a quadrupole lens assembly with a magnetic pole positioning ring and an installation method of the positioning ring, aiming at solving the problem that the magnetic pole of the quadrupole lens in the prior art is difficult to accurately position.
The invention adopts the following technical scheme to solve the technical problems:
four-pole lens assembly with magnetic pole positioning ring, this four-pole lens assembly is close to small radius department and is equipped with four magnetic poles of circumference 90 degrees uniform intervals, and encircles the yoke that is close to four-pole lens assembly large radius department in four magnetic poles outsides, its characterized in that: the four-pole lens assembly is provided with a first-stage magnetic pole positioning mechanism and a second-stage magnetic pole positioning mechanism on the front end surface and the rear end surface in the axial direction, wherein the first-stage magnetic pole positioning mechanism is a left and a right joint pin arranged at the joint of the upper half four-pole lens and the lower half four-pole lens, and the left and the right joint pins are used for coarsely positioning magnetic poles; the second-stage magnetic pole positioning mechanism is two magnetic pole positioning rings which are respectively connected with magnetic poles at the small radius positions of the front end face and the rear end face of each group of quadrupole lenses in a surrounding mode, the two magnetic pole positioning rings are used for accurately positioning the magnetic poles of the group of quadrupole lenses, high-precision coaxiality and high-precision concentricity of the magnetic poles of the group of quadrupole lenses are achieved, and the high-precision coaxiality and concentricity reach 0.03 millimeter.
The diameters of the left and right joint pins at the joint of the upper half quadrupole lens and the lower half quadrupole lens are 8 mm, and the accuracy of positioning magnetic poles is 0.1 mm; the magnetic pole positioning ring which surrounds and connects four magnetic poles at the small radius of the quadrupole lens is provided with four magnetic pole mounting holes which are uniformly spaced at 90 degrees and 4 magnetic pole positioning holes which are uniformly spaced at 90 degrees and are arranged at the inner ring of the positioning ring, the diameter of the 4 magnetic pole positioning holes is 6 millimeters, and the magnetic pole positioning precision is 0.03 millimeter.
The manufacturing material of the magnetic pole positioning ring surrounding and connecting the four magnetic poles at the small radius of the quadrupole lens is non-magnetic conduction material brass, and the magnetic pole positioning ring of the non-magnetic conduction material is used for not influencing a magnetic field in the working state of the magnetic pole; the inner diameter of the beam pipeline hole of the magnetic pole positioning ring is larger than the outer diameter of the Shu Liuguan flange; the sum of the diameters of the magnetic pole mounting hole and the magnetic pole positioning pin hole of the magnetic pole positioning ring is required to be smaller than the difference between the outer diameter of the magnetic pole positioning ring and the inner diameter of the beam pipeline hole of the magnetic pole positioning ring; the thickness of the magnetic pole positioning ring is equal to the sum of the length of the positioning pin of the magnetic pole positioning ring and the depth of the positioning hole on the magnetic pole.
The magnetic pole positioning ring installation method is characterized by comprising the following steps of:
measuring a magnetic field and determining the relative position before matching the positioning pin holes: when the quadrupole lenses are assembled for the first time, firstly, the magnetic field of each group of quadrupole lenses is measured respectively, the magnetic pole positions of the quadrupole lenses are adjusted according to the magnetic measurement result, and when the magnetic measurement result meets the design requirement, the relative positions of the upper half quadrupole lenses and the lower half quadrupole lenses are determined;
step two, matching positioning pin holes of an outer ring and an inner ring of each group of quadrupole lenses according to the determined relative positions of the magnetic poles of the upper quadrupole lenses and the lower quadrupole lenses, and installing the positioning pin holes of the outer ring and the inner ring: the positioning pin holes of the outer ring are the riding pin holes on the outer ring magnetic yoke, and the positioning pin holes of the inner ring are the magnetic pole mounting holes and the magnetic pole positioning holes on the inner ring magnetic pole positioning ring;
step three, disassembling the quadrupole lens before installing the beam pipeline: when the beam pipeline is installed, the quadrupole lens matched with the positioning pin hole is disassembled into an upper half part of the quadrupole lens and a lower half part of the quadrupole lens, before disassembly, the two magnetic pole positioning rings on the front end surface and the rear end surface of each group of quadrupole lens are required to be disassembled, and then the vacuum pipeline of the quadrupole lens is placed on the lower half part of the quadrupole lens;
step four, resetting the quadrupole lens by using pins after the beam pipeline is installed: resetting and assembling the upper half part of the quadrupole lens detached before the beam pipeline is installed with the lower half part of the quadrupole lens, if only one group of quadrupole lens is arranged, respectively sleeving magnetic pole positioning rings at the two ends of the beam pipeline, moving each magnetic pole positioning ring to the magnetic pole position at the same side for installation and positioning, and respectively inserting four positioning pins of each magnetic pole positioning ring into the positioning holes, thereby resetting the magnetic pole positions on the group of quadrupole lenses;
resetting and assembling N (N is more than 1) quadrupole lens assemblies: the common vacuum pipeline of N quadrupole lenses is sleeved into 2N-2 magnetic pole positioning rings, the 2N-2 magnetic pole positioning rings are all magnetic pole positioning rings except for the magnetic pole positioning rings at two ends of the N quadrupole lenses, the common vacuum pipeline of the N quadrupole lenses is placed on the lower half parts of the arranged N quadrupole lenses, the front and back and end faces of the N quadrupole lenses are removed, one magnetic pole positioning ring is arranged on each of the front and back magnetic pole faces of each quadrupole lens, the upper half part of each quadrupole lens and the lower half part of the quadrupole lens are assembled in sequence, then the magnetic pole positioning rings which are not installed are sleeved on the two end faces of the beam pipeline respectively, each magnetic pole positioning ring is moved to the adjacent magnetic pole to be installed and positioned, and four positioning pins of each magnetic pole positioning ring are inserted into the positioning holes respectively to reset the magnetic pole positions of the quadrupole lenses.
Advantageous effects of the invention
The invention adopts the method of combining coarse positioning, accurate positioning and positioning of the magnetic poles of the quadrupole lens, so that the error of the uniformity of the magnetic field is improved from three thousandths to five thousandths, and the error of the uniformity of the magnetic field is improved by one number grade-! The uniformity of the magnetic field is improved by one order of magnitude, so that the quality of beam current is improved by tens of times. The method comprises the following steps of: the coarse positioning lays a foundation for the fine positioning, and the fine positioning does not exist without the foundation of the coarse positioning; the thin positioning overcomes the defect of the thick positioning, and the requirement of the magnetic field uniformity error can not be met only if the thick positioning does not have the thin positioning; the magnetic field coaxial device has the advantages that coarse positioning and fine positioning are achieved, but high-precision coaxiality of a magnetic field cannot be achieved due to the fact that two ends are not used for positioning, because the coarse positioning and the fine positioning only solve the problem of high-precision concentricity of one end face magnetic pole of a quadrupole lens, but if only one end magnetic pole of the quadrupole lens is concentric, the other end magnetic pole is not concentric, namely the other end magnetic pole is not provided with a magnetic pole positioning ring, high-precision concentricity cannot be achieved, and only if the magnetic poles of the two end faces of the quadrupole lens are provided with the magnetic pole positioning rings, high-precision coaxiality and concentricity can be achieved. The invention adopts the methods of rough positioning, accurate positioning, organic combination of two-end positioning, mutual support and interdependence of the magnetic poles of the quadrupole lens, thereby obtaining outstanding substantial progress and remarkable effect.
Drawings
FIG. 1 is a front view of the four-pole lens assembly effect of the present invention with a positioning ring;
fig. 2 is a schematic perspective view of a pole positioning ring for a quadrupole lens according to the invention:
FIG. 3 is a schematic view of the installation of a first set of quadrupole lens pole set rings of the present invention:
fig. 4 is a perspective view showing the assembly effect of a single set of quadrupole lenses with positioning ring according to the invention:
fig. 5 is a perspective view showing the assembly effect of a plurality of sets of quadrupole lenses with positioning rings according to the invention.
In the figure: 1-1: quadrupole lens top half, 1-2: quadrupole lens bottom half, 2-1: a first magnetic pole; 2-2: a second magnetic pole; 2-3: a magnetic pole III; 2-4: a magnetic pole IV; 3: a magnetic pole positioning ring, a 3-1 beam pipeline hole; 3-2 mounting holes; 3-3 positioning holes; 4: a bolt; 5: and (5) positioning pins.
Detailed Description
Principle of design of the invention
First, the magnetic field is measured first, and then the pin holes are located. The pin holes comprise a riding joint pin hole on the outer ring magnetic yoke and a positioning pin hole on the inner ring magnetic yoke. After the upper and lower quadrupole lenses are hoisted and aligned, firstly measuring whether the uniformity of the magnetic field formed by the upper and lower quadrupole lenses reaches an index of which the error is not more than five parts per million, if the uniformity of the magnetic field does not reach the index, continuously measuring the magnetic field while moving the relative positions of the upper and lower quadrupole lenses through a crane until the uniformity of the magnetic field reaches the index requirement, and determining the relative positions of the upper and lower quadrupole lenses and the positions of the pin holes of the outer ring and the pin holes of the inner ring. After the positions of the pin holes are determined, the pin holes can be matched with the mounting holes and the positioning holes of the joint pins on the outer ring magnetic yoke and the magnetic pole positioning rings of the inner ring magnetic pole.
And secondly, disassembling the quadrupole lens before installing the beam pipeline. Since the uniformity of the measuring magnetic field can only be achieved before the beam tube is installed, the condition that the measuring magnetic field is not provided once the beam tube is installed is achieved, and therefore the beam tube can be installed in the magnetic pole pore canal of the quadrupole lens only after the measuring magnetic field is completed. The installation method is that the upper half quadrupole lens is taken off, the beam pipeline is laid in the neutral gear between the two magnetic poles of the lower half quadrupole lens, and then the upper half quadrupole lens is installed, so that the beam pipeline is enclosed between the gaps of the upper and lower four magnetic poles. Before the beam tube is installed, in order to measure the magnetic field and match the pinhole, the upper half quadrupole lens is already installed on the lower half quadrupole lens, and the dowel pin on the outer ring yoke and the dowel pin on the inner ring magnetic pole positioning ring are already installed, so the installed quadrupole lens, and the related dowel pin and magnetic pole positioning ring must be disassembled before the beam tube is installed.
Third, the quadrupole lens is reset by pins when reinstalling. When the quadrupole lens is reinstalled after the beam tube is installed, the position of the beam tube blocks the position of the measuring magnetic field, and the condition of measuring the magnetic field is not provided, so that a pin resetting method is necessary. In order to ensure that the original magnetic field uniformity error does not exceed five parts per million when the pin is reset, the method of combined internal and external reset and combined reset at two ends is adopted, so that each group of quadrupole lens magnetic poles can be ensured to be strictly coaxial and strictly concentric:
the method adopts the combination of inner and outer combination reset, namely the combination of coarse granularity reset of the large-radius outer ring and fine granularity reset of the small-radius inner ring of the quadrupole lens, wherein the coarse granularity reset of the outer ring is realized by adopting a hoisting soft positioning method, left and right shaking occurs in the hoisting process, if the saddle pin on the outer ring magnetic yoke is too thin, the saddle pin is easy to crush and deform, therefore, the saddle pin of the outer ring can only be a pin with relatively thick diameter, and the larger diameter is the worse the positioning precision is, so the positioning of the outer ring can only be the coarse granularity reset; the fine granularity resetting of the inner ring is realized because the outer ring is already subjected to coarse granularity resetting when the fine granularity resetting is performed, and a hoisting positioning method is not needed any more, so that pins for positioning the inner ring with small radius can be made as fine as possible, and the finer the pins, the higher the positioning precision, so that the resetting of the inner ring is fine granularity resetting. The method of combining the inside and outside or combining the thickness and the fineness is adopted for resetting, so that the high-precision concentricity of the magnetic poles after resetting is ensured; in the embodiment of the invention, the diameter of the dowel pin on the outer ring magnetic yoke is 8 mm, the coarse positioning precision is 0.1 mm, the positioning pin on the inner ring magnetic pole is 6 mm, and the magnetic pole positioning precision reaches 0.03 mm after the outer ring coarse positioning and the inner ring fine positioning are combined.
The method of combining two ends for resetting is that magnetic pole positioning rings are respectively arranged on the magnetic pole faces of two ends of a group of quadrupole lenses, and the magnetic pole positioning rings at the two ends reach the height concentricity of each magnetic pole face at the same time, so that the magnetic pole connecting line at the two ends is ensured to be parallel to the axis, thereby realizing the high-precision coaxiality of the magnetic poles during resetting.
Compared with the original method for resetting only the outer ring joint pin, the method has the advantages that the resetting precision is improved from 0.1 millimeter to 0.03 millimeter, the magnetic field uniformity error is improved from three thousandths to five thousandths, a number of grades are improved, the improvement of the number of grades is significant for the quality of the beam, the magnetic field precision is improved by 0.1 millimeter, the quality of the beam is improved by 25 times, and the conclusion is reached through accurate calculation of the beam flow mechanics.
Based on the above inventive principles, the present invention is directed to a quadrupole lens assembly with a magnetic pole positioning ring.
A four-pole lens assembly with magnetic pole positioning rings is shown in fig. 1, 2, 3, 4 and 5, wherein four magnetic poles 2-1, 2-2, 2-3 and 2-4 which are uniformly spaced in the circumferential direction by 90 degrees are arranged near a small radius of the four-pole lens assembly, and magnetic yokes which are arranged around the outer sides of the four magnetic poles and near the large radius of the four-pole lens assembly are arranged on the front end surface and the rear end surface of the four-pole lens assembly in the axial direction, a first-stage magnetic pole positioning mechanism 5 and a second-stage magnetic pole positioning mechanism 3 are respectively arranged on the front end surface and the rear end surface of the four-pole lens assembly, and the first-stage magnetic pole positioning mechanism is formed by arranging a left and a right two dowel pins 5 at the joint of an upper half four-pole lens and a lower half four-pole lens, and the left and right two dowel pins are used for roughly positioning the magnetic poles; the second-stage magnetic pole positioning mechanism 3 is two magnetic pole positioning rings 3 which are respectively connected with magnetic poles at the small radius positions of the front end face and the rear end face of each group of four-pole lenses in a surrounding mode, the two magnetic pole positioning rings 3 are used for accurately positioning the magnetic poles 2-1, 2-2, 2-3 and 2-4 of the group of four-pole lenses, high-precision coaxiality and high-precision concentricity of the magnetic poles 2-1, 2-2, 2-3 and 2-4 of the group of four-pole lenses are achieved, and the high-precision coaxiality and concentricity reach 0.03 millimeter.
Supplementary explanation:
1. the boundary between the magnetic pole and the magnetic yoke is shown in fig. 1, four magnetic yokes are arranged outside the round line close to the small radius, four magnetic poles are arranged inside the round line, the connection between the magnetic pole and the magnetic yoke is arranged inside the quadrupole lens, the connection between the magnetic pole and the magnetic yoke is not visible outside the quadrupole lens, and the internal connection schematic diagram of the four groups of magnetic poles and the magnetic yoke is shown in four dotted lines from the center of a circle to the large radius in fig. 1.
2. The left and right magnetic poles and the magnetic yokes of the upper and lower quadrupole lenses are pre-installed together by respective bolts 4 before hoisting, and the upper and lower slotted pin tops are also installed before hoisting. A space is arranged between each group of adjacent magnetic poles and the magnetic yoke.
The diameters of the left and right joint pins 5 at the joint of the upper half quadrupole lens 1-1 and the lower half quadrupole lens 1-2 are 8 mm, and the accuracy of positioning magnetic poles is 0.1 mm; the magnetic pole positioning ring 3 which surrounds and is connected with four magnetic poles at the small radius of the quadrupole lens is provided with four magnetic pole mounting holes 3-3 which are uniformly spaced at 90 degrees and are arranged on the outer ring of the positioning ring, and 4 magnetic pole positioning holes 3-2 which are uniformly spaced at 90 degrees and are arranged on the inner ring of the positioning ring, wherein the diameter of the 4 magnetic pole positioning holes 3-3 is 6 millimeters, and the magnetic pole positioning precision is 0.03 millimeter.
Supplementary explanation:
when the magnetic pole positioning ring is installed, the magnetic pole positioning ring 3 and the magnetic poles 2-1, 2-2, 2-3 and 2-4 are fixed through the magnetic pole mounting holes 3-2 of the outer ring of the magnetic pole positioning ring 3, and the magnetic pole positioning pin 3-1 is required to be used for accurately positioning the magnetic pole because the magnetic pole mounting holes have a certain amount of rectifying.
The magnetic pole positioning ring 3 which surrounds and connects the four magnetic poles at the small radius of the quadrupole lens is made of brass which is a non-magnetic conductive material, and the magnetic pole positioning ring made of the non-magnetic conductive material is used for not influencing the magnetic field in the working state of the magnetic pole; the inner diameter of the beam pipeline hole 3-1 of the magnetic pole positioning ring 3 is larger than the outer diameter of the Shu Liuguan flange; the sum of the diameters of the magnetic pole mounting holes 3-3 and the magnetic pole positioning pin holes 3-2 of the magnetic pole positioning ring 3 is required to be smaller than the difference between the outer diameter of the magnetic pole positioning ring and the inner diameter of the beam pipeline hole of the magnetic pole positioning ring; the thickness of the magnetic pole positioning ring 3 is equal to the sum of the length of the positioning pin of the magnetic pole positioning ring and the depth of the positioning hole on the magnetic pole.
The magnetic pole positioning ring installation method is characterized by comprising the following steps of:
measuring a magnetic field and determining the relative position before matching the positioning pin holes: when the quadrupole lenses are assembled for the first time, firstly, the magnetic field of each group of quadrupole lenses is measured respectively, the magnetic pole positions of the quadrupole lenses are adjusted according to the magnetic measurement result, and when the magnetic measurement result meets the design requirement, the relative positions of the upper half quadrupole lenses and the lower half quadrupole lenses are determined;
supplementary explanation:
when the quadrupole lens is assembled for the first time, in the quadrupole lens in fig. 1, only 2 longitudinal seam-riding pin holes and pins of the upper half quadrupole lens and the lower half quadrupole lens are arranged, all other pin holes and pins are not arranged, and when the magnetic field is measured, the magnetic field uniformity is adjusted only according to the mutual positions of the upper half quadrupole lens and the lower half quadrupole lens, and when the magnetic field uniformity meets the requirement, the positions of the left and right 2 seam-riding pin holes, the magnetic pole mounting holes and the magnetic pole positioning holes of the middle magnetic pole positioning ring can be determined.
Step two, matching positioning pin holes of an outer ring and an inner ring of each group of quadrupole lenses according to the determined relative positions of the magnetic poles of the upper quadrupole lenses and the lower quadrupole lenses, and installing the positioning pin holes of the outer ring and the inner ring: the positioning pin holes of the outer ring are the riding pin holes on the outer ring magnetic yoke, and the positioning pin holes of the inner ring are the magnetic pole mounting holes and the magnetic pole positioning holes on the inner ring magnetic pole positioning ring;
supplementary explanation:
after the magnetic field measurement meets the requirements, the required pin holes can be matched according to the positions of the upper half quadrupole lens and the lower half quadrupole lens at present, and meanwhile, all screws and pins are installed, including the left and right 2 joint pins on the outer ring magnet yoke and the fixing screws and pins on the inner ring magnet pole positioning ring.
Step three, disassembling the quadrupole lens before installing the beam pipeline: when the beam pipeline is installed, the quadrupole lens matched with the positioning pin hole is disassembled into an upper half part of the quadrupole lens and a lower half part of the quadrupole lens, before disassembly, the two magnetic pole positioning rings on the front end surface and the rear end surface of each group of quadrupole lens are required to be disassembled, and then the vacuum pipeline of the quadrupole lens is placed on the lower half part of the quadrupole lens;
supplementary description
The position of the beam pipeline is in conflict with that of the magnetic measuring and matching installation pin, so that the beam pipeline cannot be installed when the magnetic measuring and matching installation pin is arranged. However, after the magnetic measurement and the matching of the installation pins are completed, the beam tube must be installed, because the quadrupole lens is designed for the beam tube.
Step four, resetting the quadrupole lens by using pins after the beam pipeline is installed: as shown in fig. 4: resetting and assembling the upper half part of the quadrupole lens detached before the beam pipeline is installed with the lower half part of the quadrupole lens, if only one group of quadrupole lens is arranged, respectively sleeving magnetic pole positioning rings at the two ends of the beam pipeline, moving each magnetic pole positioning ring to the magnetic pole position at the same side for installation and positioning, and respectively inserting four positioning pins of each magnetic pole positioning ring into the positioning holes, thereby resetting the magnetic pole positions on the group of quadrupole lenses;
step five, resetting and assembling N (N > 1) quadrupole lens assemblies as shown in fig. 5: the common vacuum pipeline of N quadrupole lenses is sleeved into 2N-2 magnetic pole positioning rings, the 2N-2 magnetic pole positioning rings are all magnetic pole positioning rings except for the magnetic pole positioning rings at two ends of the N quadrupole lenses, the common vacuum pipeline of the N quadrupole lenses is placed on the lower half parts of the arranged N quadrupole lenses, the front and back and end faces of the N quadrupole lenses are removed, one magnetic pole positioning ring is arranged on each of the front and back magnetic pole faces of each quadrupole lens, the upper half part of each quadrupole lens and the lower half part of the quadrupole lens are assembled in sequence, then the magnetic pole positioning rings which are not installed are sleeved on the two end faces of the beam pipeline respectively, each magnetic pole positioning ring is moved to the adjacent magnetic pole to be installed and positioned, and four positioning pins of each magnetic pole positioning ring are inserted into the positioning holes respectively to reset the magnetic pole positions of the quadrupole lenses.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (3)
1. Four-pole lens assembly with magnetic pole positioning ring, this four-pole lens assembly is close to small radius department and is equipped with four magnetic poles of circumference 90 degrees uniform intervals, and encircles the yoke that is close to four-pole lens assembly large radius department in four magnetic poles outsides, its characterized in that: the four-pole lens assembly is provided with a first-stage magnetic pole positioning mechanism and a second-stage magnetic pole positioning mechanism on the front end surface and the rear end surface in the axial direction, wherein the first-stage magnetic pole positioning mechanism is a left and right two joint pins arranged at the joint of the upper half four-pole lens and the lower half four-pole lens, and the left and right two joint pins are used for roughly positioning magnetic poles; the second-stage magnetic pole positioning mechanism is two magnetic pole positioning rings which are respectively connected with magnetic poles at the small radius positions of the front end surface and the rear end surface of each group of quadrupole lenses in a surrounding mode, the two magnetic pole positioning rings are used for accurately positioning the magnetic poles of the group of quadrupole lenses, high-precision coaxiality and high-precision concentricity of the magnetic poles of the group of quadrupole lenses are achieved, and the high-precision coaxiality and concentricity reach 0.03 millimeter;
the diameters of the left and right joint pins at the joint of the upper half quadrupole lens and the lower half quadrupole lens are 8 mm, and the accuracy of positioning magnetic poles is 0.1 mm; the magnetic pole positioning ring which surrounds and connects four magnetic poles at the small radius of the quadrupole lens is provided with four magnetic pole mounting holes which are uniformly spaced at 90 degrees and 4 magnetic pole positioning holes which are uniformly spaced at 90 degrees and are arranged at the inner ring of the positioning ring, the diameter of the 4 magnetic pole positioning holes is 6 millimeters, and the magnetic pole positioning precision is 0.03 millimeter.
2. A quadrupole lens assembly with a pole positioning ring as set forth in claim 1 wherein: the manufacturing material of the magnetic pole positioning ring surrounding and connecting the four magnetic poles at the small radius of the four-pole lens is non-magnetic conduction material brass, and the magnetic pole positioning ring of the non-magnetic conduction material is used for not influencing a magnetic field in the working state of the magnetic poles; the inner diameter of the beam pipeline hole of the magnetic pole positioning ring is larger than the outer diameter of the Shu Liuguan flange; the sum of the diameters of the magnetic pole mounting hole and the magnetic pole positioning pin hole of the magnetic pole positioning ring is required to be smaller than the difference between the outer diameter of the magnetic pole positioning ring and the inner diameter of the beam pipeline hole of the magnetic pole positioning ring; the thickness of the magnetic pole positioning ring is equal to the sum of the length of the positioning pin of the magnetic pole positioning ring and the depth of the positioning hole on the magnetic pole.
3. A pole positioning ring mounting method for a quadrupole lens assembly having a pole positioning ring as recited in claim 1, comprising the steps of:
measuring a magnetic field and determining the relative position before matching the positioning pin holes: when the quadrupole lenses are assembled for the first time, firstly, the magnetic field of each group of quadrupole lenses is measured respectively, the magnetic pole positions of the quadrupole lenses are adjusted according to the magnetic measurement result, and when the magnetic measurement result meets the design requirement, the relative positions of the upper half quadrupole lenses and the lower half quadrupole lenses are determined;
step two, matching positioning pin holes of an outer ring and an inner ring of each group of quadrupole lenses according to the determined relative positions of the magnetic poles of the upper quadrupole lenses and the lower quadrupole lenses, and installing the positioning pin holes of the outer ring and the inner ring: the positioning pin holes of the outer ring are the riding pin holes on the outer ring magnetic yoke, and the positioning pin holes of the inner ring are the magnetic pole mounting holes and the magnetic pole positioning holes on the inner ring magnetic pole positioning ring;
step three, disassembling the quadrupole lens before installing the beam pipeline: when the beam pipeline is installed, the quadrupole lens matched with the positioning pin hole is disassembled into an upper half part of the quadrupole lens and a lower half part of the quadrupole lens, before disassembly, the two magnetic pole positioning rings on the front end surface and the rear end surface of each group of quadrupole lens are required to be disassembled, and then the vacuum pipeline of the quadrupole lens is placed on the lower half part of the quadrupole lens;
step four, resetting the quadrupole lens by using pins after the beam pipeline is installed: resetting and assembling the upper half part of the quadrupole lens detached before the beam pipeline is installed with the lower half part of the quadrupole lens, if only one group of quadrupole lens is arranged, respectively sleeving magnetic pole positioning rings at the two ends of the beam pipeline, moving each magnetic pole positioning ring to the magnetic pole position at the same side for installation and positioning, and respectively inserting four positioning pins of each magnetic pole positioning ring into the positioning holes, thereby resetting the magnetic pole positions on the group of quadrupole lenses; resetting and assembling N quadrupole lens assemblies: the common vacuum pipeline of N quadrupole lenses is sleeved into 2N-2 magnetic pole positioning rings, wherein the 2N-2 magnetic pole positioning rings are all magnetic pole positioning rings except for the magnetic pole positioning rings at the two ends of the N quadrupole lenses, the common vacuum pipeline of N quadrupole lenses is placed on the lower half parts of the arranged N quadrupole lenses, the front and rear end surfaces and the end surfaces of the N quadrupole lenses are removed, one magnetic pole is positioned on each of the front and rear magnetic pole surfaces of each quadrupole lens, and N is more than 1.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB886412A (en) * | 1957-03-13 | 1962-01-03 | Mullard Ltd | Improvements in or relating to deflection and focusing apparatus for cathode ray tubes |
| US4174479A (en) * | 1977-09-30 | 1979-11-13 | Boerboom Anne J H | Mass spectrometer |
| JPH04209500A (en) * | 1990-11-30 | 1992-07-30 | Hitachi Ltd | Ion beam acceleration and deceleration unit |
| JPH05334979A (en) * | 1992-06-01 | 1993-12-17 | Agency Of Ind Science & Technol | Lens structure for charged beam |
| CN2867584Y (en) * | 2005-12-05 | 2007-02-07 | 北京中科信电子装备有限公司 | Magnetic quadripolar lens |
| CN102208226A (en) * | 2011-05-10 | 2011-10-05 | 中国科学院近代物理研究所 | High-accuracy three-combination quadrupole lens |
| CN202025539U (en) * | 2011-05-10 | 2011-11-02 | 中国科学院近代物理研究所 | High-precision three-combination quadrupole lens |
| CN105448515A (en) * | 2016-01-05 | 2016-03-30 | 中国科学院合肥物质科学研究院 | Superconducting coil making method capable of providing strong magnetic field condition for X-ray total-scattering apparatus |
| CN109724499A (en) * | 2018-12-25 | 2019-05-07 | 合肥中科离子医学技术装备有限公司 | One kind being used for cyclotron magnetic pole gap measuring device and method |
| CN111954363A (en) * | 2020-08-18 | 2020-11-17 | 兰州科近泰基新技术有限责任公司 | Method for manufacturing small-aperture high-gradient magnetic field quadrupole lens |
-
2021
- 2021-06-17 CN CN202110671606.8A patent/CN113421688B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB886412A (en) * | 1957-03-13 | 1962-01-03 | Mullard Ltd | Improvements in or relating to deflection and focusing apparatus for cathode ray tubes |
| US4174479A (en) * | 1977-09-30 | 1979-11-13 | Boerboom Anne J H | Mass spectrometer |
| JPH04209500A (en) * | 1990-11-30 | 1992-07-30 | Hitachi Ltd | Ion beam acceleration and deceleration unit |
| JPH05334979A (en) * | 1992-06-01 | 1993-12-17 | Agency Of Ind Science & Technol | Lens structure for charged beam |
| CN2867584Y (en) * | 2005-12-05 | 2007-02-07 | 北京中科信电子装备有限公司 | Magnetic quadripolar lens |
| CN102208226A (en) * | 2011-05-10 | 2011-10-05 | 中国科学院近代物理研究所 | High-accuracy three-combination quadrupole lens |
| CN202025539U (en) * | 2011-05-10 | 2011-11-02 | 中国科学院近代物理研究所 | High-precision three-combination quadrupole lens |
| CN105448515A (en) * | 2016-01-05 | 2016-03-30 | 中国科学院合肥物质科学研究院 | Superconducting coil making method capable of providing strong magnetic field condition for X-ray total-scattering apparatus |
| CN109724499A (en) * | 2018-12-25 | 2019-05-07 | 合肥中科离子医学技术装备有限公司 | One kind being used for cyclotron magnetic pole gap measuring device and method |
| CN111954363A (en) * | 2020-08-18 | 2020-11-17 | 兰州科近泰基新技术有限责任公司 | Method for manufacturing small-aperture high-gradient magnetic field quadrupole lens |
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