Multi-wire detector for extremely high vacuum environment

Abstract

The invention relates to the technical field of accelerator beam diagnosis, in particular to a multi-wire detector for an extremely high vacuum environment. The multi-wire detector comprises wire layer structures and supporting columns, the two wire layer structures are arranged in an up-down spaced mode through the supporting columns, and the measuring wires are arranged in the longitudinal direction and the transverse direction to form a net-shaped structure, and the net-shaped structure is used for measuring beams passing through the through opening in the direction perpendicular to the plate face of the supporting plate; the wire layer structure is provided with a first traction part and a second traction part which are connected with the two ends of the measuring wire respectively, the first traction part is used for adjusting the pre-tightening force applied to the measuring wire, and the second traction part is used for accommodating the elongation of the measuring wire after being heated and expanded; and the measuring wire is ensured to be kept in a tensioning state in the measuring process. According to the invention, the first traction part and the second traction part cooperate with each other to tension the measuring wire, so that the tension of the measuring wire can be conveniently, repeatedly and finely adjusted, and the measuring wire can be ensured to be continuously tensioned in the measuring process.

Description

Technical Field

[0001] The present invention relates to the technical field of accelerator beam diagnosis, in particular to a multi-wire detector used in an extremely high vacuum environment. Background Art

[0002] The multi-wire detector is installed in the boost ring (BRing) of the high-intensity heavy ion accelerator (HIAF) and is used to measure the beam profile and emittance information of the injection beam and the first ring beam. The multi-wire detector measures the secondary electron emission signal generated by the beam acting on each measuring wire, and combines the actual physical position of each measuring wire to achieve beam profile measurement and emittance measurement. Compared with the single-wire detector, the multi-wire detector reduces the measuring stroke of the detector, so that the measurement results can be obtained more quickly. At the same time, because the booster (BRing) has extremely high requirements for vacuum (average vacuum ≤ 10 -9 Pa), all online equipment needs to be baked at a high temperature of 250°C, which puts extremely high demands on the design of multi-wire detectors.

[0003] Based on research on similar devices both domestically and internationally, multi-wire detectors mostly use a welded wire structure. However, this structure cannot be used in ultra-high vacuum environments due to air entrapment at the weld points and insufficient tension within the wire. Alternatively, some multi-wire detectors use a torsion spring structure to tension the measuring wire. However, field testing of prototypes revealed the following issues: 1. Insufficient torsion spring tension prevented the measuring wire from returning to its original position after high-temperature baking. 2. Adjustable wire tension was impossible; once the wire drawing operation was complete, fine-tuning the wire tension was impossible. 3. Signal connection was difficult, and the signal wire often loosened. Consequently, the tension of the measuring wire could not be fine-tuned, resulting in insufficient tension throughout the entire wire assembly. 4. The wire drawing operation was cumbersome, labor-intensive, and costly. 5. The measuring wire could not maintain tension after the beam's high-temperature expansion. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention provides a multi-wire probe for use in extremely high vacuum environments. This probe allows for convenient fine-tuning of the tension of the measuring wires, ensuring that the measuring wires remain taut despite thermal expansion, thereby ensuring accurate measurements.

[0005] The present invention provides a multi-wire detector for use in an extremely high vacuum environment, the multi-wire detector comprising: The wire layer structure comprises a support plate with a through hole in the middle, two fixing blocks connected to the support plate and spaced apart on both sides of the through hole, and a plurality of measuring wires suspended between the two fixing blocks and arranged in parallel and spaced apart; A support column connected to the surface of the support plate; The two wire layer structures are spaced apart from each other by the support column and the measuring wires are arranged longitudinally and transversely to form a mesh structure, which is used to measure the beam flow passing through the through-hole in the vertical direction of the support plate surface; The wire layer structure is provided with a first pulling part and a second pulling part respectively connected to the two ends of the measuring wire. The first pulling part is used to adjust the pre-tightening force applied to the measuring wire, and the second pulling part is used to accommodate the elongation of the measuring wire after thermal expansion, ensuring that the measuring wire remains in a tensioned state during the measurement process.

[0006] According to a multi-filament detector for an extremely high vacuum environment provided by the present invention, the fixing block is provided with a plurality of mounting holes arranged at equal intervals along its length and staggered at a first height and a second height, the mounting holes extending through the fixing block along the width direction of the fixing block; The first pulling portion and the second pulling portion are embedded in the installation hole in a one-to-one correspondence and cooperate with the installation hole to tension the measuring wire.

[0007] According to a multi-wire detector for an extremely high vacuum environment provided by the present invention, the mounting channel is sequentially arranged along its axial direction into a threaded hole section, a circular hole section, and a through hole section, the diameter of the through hole section is smaller than the diameter of the circular hole section, and the diameter of the circular hole section is smaller than the diameter of the threaded hole section; The fixing block is arranged close to the through opening at the side where the through hole section is located, and the two fixing blocks are parallel to each other and aligned with the installation channel.

[0008] According to a multi-wire detector for an extremely high vacuum environment provided by the present invention, the first pulling portion includes a pulling rod, a first stud and a first spring; One end of the pulling rod is embedded in the circular hole section, the other end of the pulling rod passes through the through hole section and is connected to the measuring wire, the first stud is embedded in the threaded hole section and abuts against the pulling rod, the first spring is embedded in the circular hole section and abuts against the pulling rod, and the pulling rod can move along its axial direction relative to the fixed block.

[0009] According to a multi-wire detector for an extremely high vacuum environment provided by the present invention, the second pulling portion includes a perforated ball, a second stud and a second spring; The perforated ball is movably embedded in the circular hole section, the second stud is embedded in the threaded hole section, the second spring is embedded in the circular hole section and arranged between the perforated ball and the through hole section, and the measuring wire passes through the through hole section and the second spring and is connected to the perforated ball; The spring constant of the first spring is greater than the spring constant of the second spring. A gap is provided between the perforated ball and the second stud for accommodating the elongation of the measuring wire due to thermal expansion during measurement.

[0010] According to a multi-wire detector for an extremely high vacuum environment provided by the present invention, the wire layer structure further comprises a guide block having a plurality of guide grooves. The fixing block is arranged along the edge of the support plate, and the guide block is arranged along the edge of the through-hole. The guide block is parallel to and aligned with the fixing block, so that the measuring wires are clamped in the guide grooves in a one-to-one correspondence.

[0011] According to a multi-wire detector for an extremely high vacuum environment provided by the present invention, a positioning groove is provided on the plate surface of the support plate, and the guide block and the fixed block are respectively transitionally matched with the positioning groove to ensure that the parallelism between the guide block and the fixed block is less than 0.1 mm.

[0012] According to a multi-wire detector for an extremely high vacuum environment provided by the present invention, the wire layer structure also includes a signal connector, a wiring hole is provided at one end of the signal connector, a threaded hole is provided at the other end of the signal connector, and an exhaust groove is provided on the hole wall of the wiring hole.

[0013] According to a multi-wire detector for an extremely high vacuum environment provided by the present invention, the wire layer structure also includes a wire clamp made of oxygen-free copper material. The end of the measuring wire passes through the first pulling part or the second pulling part and then wraps around and overlaps with itself. The wire clamp clamps and fixes the end of the measuring wire.

[0014] According to the multi-wire detector for an extremely high vacuum environment provided by the present invention, the first spring and the second spring are both made of Hastelloy.

[0015] The above one or more technical solutions in the present invention have at least one of the following technical effects: The measuring wire arranged in the wire layer structure is tensioned in pairs by the first pulling part and the second pulling part, so that the tensioning force of the measuring wire can still be conveniently fine-tuned after the wire drawing is completed, and a redundant gap is provided for the length change of the measuring wire when it heats up and expands, which can ensure that the measuring wire is continuously tensioned during the measurement process, thereby improving the accuracy of the measurement.

[0016] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or can be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A top view of a multi-wire detector provided in an embodiment of the present invention.

[0019] Figure 2 A front view of a multi-wire detector provided in an embodiment of the present invention.

[0020] Figure 3 A top view of the silk layer structure provided by an embodiment of the present invention.

[0021] Figure 4 for Figure 3 Schematic cross-sectional view of a horizontal section of the midfilament layer structure.

[0022] Figure 5 for Figure 4 A magnified schematic diagram of the local structure of B.

[0023] Figure 6 for Figure 4 Enlarged schematic diagram of the local structure of center C.

[0024] Figure 7 A schematic diagram of the three-dimensional structure of a fixing block provided in an embodiment of the present invention.

[0025] Figure 8 A front view of a fixing block provided in an embodiment of the present invention.

[0026] Figure 9 for Figure 8 Schematic cross-sectional view of section AA.

[0027] Figure 10 A front view of a guide block provided in an embodiment of the present invention.

[0028] Figure 11 A schematic diagram of the three-dimensional structure of a signal connector provided by an embodiment of the present invention.

[0029] Figure 12 for Figure 11 Schematic diagram of the axial cross-section of the signal connector.

[0030] Reference numerals: 100. Wire layer structure; 110. Support plate; 111. Through-hole; 112. Positioning groove; 120. Fixing block; 121. Mounting channel; 121a. Threaded hole section; 121b. Circular hole section; 121c. Through-hole section; 130. Measuring wire; 140. Guide block; 141. Guide groove; 150. Signal connector; 151. Wiring hole; 152. Threaded hole; 153. Exhaust groove; 160. Wire clamp; 170. First pulling part; 171. Pulling rod; 172. First stud; 173. First spring; 180. Second pulling part; 181. Perforated ball; 182. Second stud; 183. Second spring; 200. Support column. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0034] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms are not limited to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0036] In an embodiment of the present invention, a multi-wire detector for use in an extremely high vacuum environment is introduced.

[0037] like Figures 1 to 4 As shown, the multi-wire detector mainly includes two wire layer structures 100 spaced apart in the upper and lower parts of the space. The wire layer structure 100 mainly includes a support plate 110, a fixing block 120 and a plurality of measuring wires 130.

[0038] The support plate 110 has a through hole 111 in the middle thereof. The fixing blocks 120 are connected to the support plate 110. Two fixing blocks 120 are arranged on both sides of the through hole 111 in parallel and at intervals.

[0039] The middle portion of the measuring wire 130 is suspended above the through hole 111. Both ends of the measuring wire 130 are connected to the fixing blocks 120 located on both sides of the through hole 111. Several measuring wires 130 are arranged in parallel and spaced apart along the length direction of the fixing block 120.

[0040] The multi-wire detector further comprises a support column 200. The support column 200 is connected to the surface of the support plate 110. The support plate 110 is configured as a square flat plate and has positioning pin holes at the corner ends thereof.

[0041] The two wire layer structures 100 are spaced apart vertically by the support column 200. The two wire layer structures 100 respectively arrange the measuring wires 130 longitudinally and transversely to form a mesh structure for measuring the beam flow passing through the through opening 111 in the vertical direction of the support plate 110.

[0042] The two wire layers 100 are connected to the support column 200 via positioning pin holes, ensuring that the two sets of measuring wires 130 are perpendicular to each other. Thus, along the vertical direction of the support plate 110, within the projection area corresponding to the through-hole 111, the projections of the two sets of measuring wires 130 form a grid-like network.

[0043] Specifically, the wire layer structure 100 is provided with a first pulling portion 170 and a second pulling portion 180. The first pulling portion 170 is used to adjust the preload force applied to the measuring wire 130. The second pulling portion 180 is used to accommodate the elongation of the measuring wire 130 due to thermal expansion, ensuring that the measuring wire 130 remains taut during the measurement process.

[0044] Specifically, the first pulling part 170 and the second pulling part 180 are respectively connected to the two ends of the measuring wire 130. The elastic modulus of the first pulling part 170 is greater than the elastic modulus of the second pulling part 180, and different deformation amounts can be generated when the measuring wire 130 is tensioned. For example, the first pulling part 170 and the second pulling part 180 pull the measuring wire 130 in opposite directions. The deformation amount of the second pulling part 180 is greater than the deformation amount of the first pulling part 170, and the difference in deformation amount between the first pulling part 170 and the second pulling part 180 can provide redundant deformation space for the elongation of the measuring wire 130. Correspondingly, by controlling the deformation amount of the first pulling part 170, the tensioning force of the measuring wire 130 can be fine-tuned.

[0045] In this embodiment, the measuring wire 130 arranged in the wire layer structure 100 is tensioned in pairs by the first pulling part 170 and the second pulling part 180, so that the tensioning force of the measuring wire 130 can still be conveniently fine-tuned after the wire drawing is completed, and a redundant gap is provided for the length change of the measuring wire 130 when it heats up and expands, which can ensure that the measuring wire 130 is continuously tensioned during the measurement process, thereby improving the accuracy of the measurement.

[0046] Based on the above embodiment, another embodiment of the present invention introduces a multi-wire detector for use in an extremely high vacuum environment.

[0047] like Figures 4 to 9As shown, the fixing block 120 is provided with a plurality of mounting holes 121. The plurality of mounting holes 121 are arranged at equal intervals along the length of the fixing block 120 and staggered at a first height and a second height, so that the mounting holes 121 can be kept at a certain distance to avoid short circuits of the measuring wires 130 passing through adjacent mounting holes 121.

[0048] The mounting hole 121 extends through the fixing block 120 along the width direction of the fixing block 120. The first pulling portion 170 and the second pulling portion 180 are embedded in the mounting hole 121 in a one-to-one correspondence. The mounting hole 121 fixes the first pulling portion 170 and the second pulling portion 180 and provides a reaction force.

[0049] Therefore, the measuring wire 130 can be tensioned by controlling the first pulling portion 170 and the second pulling portion 180 to deform and cooperate with the installation channel 121 .

[0050] Furthermore, the mounting channel 121 is sequentially arranged along its axial direction into a threaded hole section 121a, a circular hole section 121b and a through hole section 121c. The diameter of the through hole section 121c is smaller than that of the circular hole section 121b. The diameter of the circular hole section 121b is smaller than that of the threaded hole section 121a.

[0051] The fixing block 120 is disposed with the side where the through hole section 121c is located close to the through opening 111. In this way, by respectively embedding the first pulling portion 170 and the second pulling portion 180 in the mounting channels 121 located on both sides of the through opening 111, the first pulling portion 170 and the second pulling portion 180 can be compressed and deformed, thereby facilitating control of the deformation of the first pulling portion 170 and the second pulling portion 180 in the mounting channels 121, and further fine-tuning the pulling force applied by the first pulling portion 170 and the second pulling portion 180 to the measuring wire 130.

[0052] The two fixing blocks 120 are parallel to each other. In addition, the mounting holes 121 on the two fixing blocks 120 are also aligned one by one.

[0053] Based on the above embodiment, another embodiment of the present invention introduces a multi-wire detector for use in an extremely high vacuum environment.

[0054] The first pulling portion 170 includes a pulling rod 171, a first stud 172, and a first spring 173. The pulling rod 171 is movably embedded in the mounting hole 121. The pulling rod 171 can move relative to the fixing block 120 along its axial direction.

[0055] Specifically, if Figure 5As shown, one end of the pulling rod 171 is embedded in the circular hole section 121b. The other end of the pulling rod 171 passes through the through hole section 121c and protrudes from the fixing block 120. The other end of the pulling rod 171 is connected to the measuring wire 130.

[0056] The first screw 172 is embedded in the threaded hole section 121 a and contacts the pull rod 171 . The first spring 173 is embedded in the circular hole section 121 b and contacts the pull rod 171 .

[0057] By adjusting the length of the first screw 172 embedded in the threaded hole section 121 a, the compression amount of the first spring 173 can be changed. Therefore, the preload force applied to the measuring wire 130 can be adjusted by the first screw 172 .

[0058] Furthermore, if Figure 6 As shown, the second pulling portion 180 includes a perforated ball 181 , a second stud 182 and a second spring 183 .

[0059] The perforated ball 181 is movably embedded in the circular hole section 121b. The second stud 182 is embedded in the threaded hole section 121a. The second spring 183 is embedded in the circular hole section 121b. Moreover, the second spring 183 is arranged between the perforated ball 181 and the through hole section 121c.

[0060] The measuring wire 130 passes through the through-hole section 121 c and the second spring 183 and is connected to the perforated ball 181 .

[0061] Specifically, the spring constant of the first spring 173 is greater than that of the second spring 183. When subjected to the same applied force, the second spring 183 compresses more than the first spring 173, resulting in redundant deformation of the second spring 183. When the measuring wire 130 is tensioned, a gap is created between the perforated ball 181 and the second stud 182 to accommodate the elongation of the measuring wire 130 due to thermal expansion during measurement.

[0062] That is, when the measuring wire 130 heats up and expands under the action of the beam, the second spring 183 can use the gap to rebound, thereby continuing to ensure that the measuring wire 130 is in a taut state.

[0063] Based on the above embodiment, another embodiment of the present invention introduces a multi-wire detector for use in an extremely high vacuum environment.

[0064] like Figure 3 , Figure 4 and Figure 10As shown, the wire layer structure 100 further includes a guide block 140 having a plurality of guide grooves 141 .

[0065] The fixing block 120 is disposed along the edge of the support plate 110. The guide block 140 is disposed along the edge of the through opening 111. The guide block 140 is parallel to and aligned with the fixing block 120, so that the measuring wires 130 are engaged in the guide slots 141 in a one-to-one correspondence.

[0066] Preferably, the width of the guide groove 141 is The depth of the guide groove 141 is 2 mm, and the spacing between adjacent guide grooves 141 is Correspondingly, the diameter of the measuring wire 130 is 0.1 mm, and the position accuracy is ensured by the guide groove 141 .

[0067] Furthermore, a positioning groove 112 is formed on the surface of the support plate 110. The positioning groove 112 is finely machined. The guide block 140 and the fixed block 120 are respectively transitionally matched with the positioning groove 112 to ensure that the parallelism between the guide block 140 and the fixed block 120 is less than 0.1 mm.

[0068] Specifically, the two guide blocks 140 are fixed parallel to the support plate 110 to guide the starting position and the ending position of the measuring wire 130. The two fixing blocks 120 are respectively disposed on both sides of the guide block 140.

[0069] Preferably, the support plate 110 is made of stainless steel and is subjected to high-temperature degassing after fine machining to be suitable for an extremely high vacuum environment. The fixing block 120 and the guide block 140 are both made of ceramics through fine machining.

[0070] The measuring wire 130 is made of a gold-plated tungsten-rhenium alloy wire, which has higher toughness than a gold-plated tungsten wire.

[0071] Furthermore, if Figure 11 and Figure 12 As shown, the wire layer structure 100 further includes a signal connector 150. A wiring hole 151 is provided at one end of the signal connector 150. A threaded hole 152 is provided at the other end of the signal connector. In addition, an exhaust groove 153 is provided on the wall of the wiring hole 151.

[0072] Preferably, the signal connector 150 is made of oxygen-free copper.

[0073] In this embodiment, the signal connector 150 is used to connect the signal line after the measuring wire 130 is tensioned. The signal connector 150 is connected to the first stud 172 and the second stud 182 through the threaded hole 152. The other end of the signal connector 150 is inserted into the wiring hole 151 with a jackscrew to tighten the signal line, making signal line connection simpler and faster.

[0074] Furthermore, the wire layer structure 100 further includes a wire clamp 160 made of oxygen-free copper. The end of the measuring wire 130 passes through the first pulling portion 170 or the second pulling portion 180 and then loops back and overlaps with itself. The wire clamp 160 clamps and secures the end of the measuring wire 130.

[0075] Furthermore, because the multi-wire detector is installed in an extremely high vacuum environment, it requires high-temperature degassing at 250°C. Stainless steel springs lose their elasticity at high temperatures, while Hastelloy springs, after high-temperature testing, maintain excellent elasticity. Therefore, both first spring 173 and second spring 183 are made of Hastelloy.

[0076] On the other hand, in another embodiment of the present invention, a method for assembling a multi-wire detector is introduced.

[0077] S1. Threading the wires: Trim several measuring wires 130 to a suitable length for later use. Pass one end of each measuring wire 130 through the perforated ball 181 , wrap it around, and then clamp it with the wire clamp 160 .

[0078] S2. Assemble the first pulling part 170: sequentially place the first spring 173, the pulling rod 171, and the first stud 172 into the mounting hole 121 of the fixing block 120, and screw the first stud 172 to its maximum depth. At this point, the deformation of the first spring 173 is maximum.

[0079] S3. Assemble the second pulling part 180: Place the second spring 183 into the mounting hole 121 of the fixing block 120, then insert the perforated ball 181 with the measuring wire 130, lead the measuring wire 130 out of the mounting hole 121, tighten it with tweezers and pass it through the connecting hole of the pulling rod 171, and then clamp it with the wire clamp 160.

[0080] S4 , tightening the measuring wire 130 : screwing the second screw 182 to a minimum depth, and then adjusting the first screw 172 to tighten the measuring wire 130 .

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-wire detector for use in an extremely high vacuum environment, characterized in that: include: A wire layer structure (100) comprises a support plate (110) with a through hole (111) formed in the middle, two fixing blocks (120) connected to the support plate (110) and spaced apart on both sides of the through hole (111), and a plurality of measuring wires (130) suspended between the two fixing blocks (120) and spaced apart and arranged in parallel. A support column (200) connected to the surface of the support plate (110); The two wire layer structures (100) are spaced apart vertically by the support column (200) and the measuring wires (130) are arranged longitudinally and transversely to form a mesh structure for measuring the beam passing through the through opening (111) in a direction perpendicular to the surface of the support plate (110); The wire layer structure (100) is provided with a first pulling portion (170) and a second pulling portion (180) respectively connected to the two ends of the measuring wire (130), wherein the first pulling portion (170) is used to adjust the pre-tightening force applied to the measuring wire (130), and the second pulling portion (180) is used to accommodate the elongation of the measuring wire (130) after thermal expansion, thereby ensuring that the measuring wire (130) remains in a tensioned state during the measurement process.

2. The multi-wire detector for extremely high vacuum environment according to claim 1, characterized in that: The fixing block (120) is provided with a plurality of mounting holes (121) arranged at equal intervals along its length direction and staggered at a first height and a second height, and the mounting holes (121) extend through the fixing block (120) along the width direction of the fixing block (120); The first pulling portion (170) and the second pulling portion (180) are embedded in the mounting hole (121) in a one-to-one correspondence and cooperate with the mounting hole (121) to tension the measuring wire (130).

3. The multi-wire detector for extremely high vacuum environment according to claim 2, characterized in that: The mounting channel (121) is sequentially arranged along its axial direction into a threaded hole section (121a), a circular hole section (121b), and a through hole section (121c); the diameter of the through hole section (121c) is smaller than the diameter of the circular hole section (121b), and the diameter of the circular hole section (121b) is smaller than the diameter of the threaded hole section (121a); The fixing block (120) is arranged close to the through opening (111) on the side where the through hole section (121c) is located, and the two fixing blocks (120) are parallel to each other and aligned with the installation channel (121).

4. The multi-wire detector for extremely high vacuum environment according to claim 3, characterized in that: The first pulling portion (170) comprises a pulling rod (171), a first stud (172) and a first spring (173); One end of the pulling rod (171) is embedded in the circular hole section (121b), the other end of the pulling rod (171) passes through the through hole section (121c) and is connected to the measuring wire (130), the first stud (172) is embedded in the threaded hole section (121a) and abuts against the pulling rod (171), the first spring (173) is embedded in the circular hole section (121b) and abuts against the pulling rod (171), and the pulling rod (171) can move along its axial direction relative to the fixed block (120).

5. The multi-wire detector for extremely high vacuum environment according to claim 4, characterized in that: The second pulling portion (180) comprises a perforated ball (181), a second stud (182) and a second spring (183); The perforated ball (181) is movably embedded in the circular hole section (121b), the second stud (182) is embedded in the threaded hole section (121a), the second spring (183) is embedded in the circular hole section (121b) and is arranged between the perforated ball (181) and the through hole section (121c), and the measuring wire (130) passes through the through hole section (121c) and the second spring (183) and is connected to the perforated ball (181); The spring constant of the first spring (173) is greater than the spring constant of the second spring (183), and a gap is provided between the perforated ball (181) and the second stud (182) for accommodating the elongation of the measuring wire (130) due to thermal expansion during measurement.

6. The multi-wire detector for use in an extremely high vacuum environment according to any one of claims 1 to 5, characterized in that: The silk layer structure (100) further includes a guide block (140) having a plurality of guide grooves (141). The fixed block (120) is arranged along the edge of the support plate (110), and the guide block (140) is arranged along the edge of the through opening (111). The guide block (140) is parallel to and aligned with the fixed block (120), so that the measuring wires (130) are clamped in the guide grooves (141) in a one-to-one correspondence.

7. The multi-wire detector for extremely high vacuum environment according to claim 6, characterized in that: A positioning groove (112) is provided on the surface of the support plate (110), and the guide block (140) and the fixed block (120) are respectively transitionally matched with the positioning groove (112) to ensure that the parallelism between the guide block (140) and the fixed block (120) is less than 0.1 mm.

8. The multi-wire detector for use in an extremely high vacuum environment according to claim 6, characterized in that: The wire layer structure (100) further comprises a signal connector (150), one end of the signal connector (150) is provided with a wiring hole (151), the other end of the signal connector (150) is provided with a threaded hole (152), and a venting groove (153) is provided on the hole wall of the wiring hole (151).

9. The multi-wire detector for use in an extremely high vacuum environment according to claim 6, characterized in that: The wire layer structure (100) further includes a wire clamp (160) made of oxygen-free copper material. The end of the measuring wire (130) passes through the first pulling portion (170) or the second pulling portion (180), then loops back and overlaps with itself. The wire clamp (160) clamps and fixes the end of the measuring wire (130).

10. The multi-wire detector for use in an extremely high vacuum environment according to claim 5, characterized in that: The first spring (173) and the second spring (183) are both made of Hastelloy.

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