A glass gas chamber, its preparation method and application

Abstract

This application provides a glass gas cell, its preparation method, and its application. The preparation method includes steps for preparing an inner core prototype and an outer shell prototype, a glass gas cell prototype preparation step, and a glass gas cell preparation step. Specifically, the inner core prototype and outer shell prototype preparation steps produce a first expansion tube segment with a first cylinder and a second expansion tube segment with a second cylinder. In the glass gas cell prototype preparation step, a ring-shaped glass gas cell prototype is obtained by sealing the two ends of the first and second cylinders. In the glass gas cell preparation step, the glass gas cell is prepared by softening and shrinking the ring-shaped glass gas cell prototype at a point along one diameter. The glass gas cell obtained by the preparation method of this application has a large receiving angle and can be applied to scientific research experiments emitting neutrons with a large divergence angle spanning up to 180°.

Description

Technical Field

[0001] This invention relates to the field of glass preparation technology, specifically to a glass gas chamber, its preparation method, and its application. Background Technology

[0002] Polarized neutron scattering, as the only effective means of separating nuclear, magnetic, coherent, and incoherent scattering, is an advanced experimental technique and method urgently needed for studying complex materials. In polarized neutron scattering experiments, neutron spin filters are required at the incident and exit ends of the sample, serving as neutron polarizers and neutron analyzers, respectively. The neutrons at the exit end often have a wide wavelength range, and the angle range formed by their scattering directions is generally also relatively large. Based on these two factors, achieving spin filtering of the exiting neutrons has become a challenge. Currently, commonly used neutron spin filtering devices include polarized monochromators, supermirror polarizers, and polarization-based... 3 He's spin filter, relative to polarization monochromators and supermirror polarizers, is based on polarization... 3 He neutron polarization technology has become the world's mainstream technology due to its significant advantages, such as large acceptance angle, high polarizability, low background, wide energy spectrum, and uniform polarization and analysis capabilities.

[0003] Based on polarization 3 In He neutron polarization technology, there are two techniques that can... 3 He gas is polarized using metastable exchange optical pumping (MEOP) and spin exchange optical pumping (SEOP) technologies. The core component of SEOP technology is a packaged N2... 3 Polarization of He gas and alkali metals (usually K and Rb) 3 Helium glass chambers are typically cylindrical; however, the coverage angle of the end face of a cylindrical glass chamber is limited, often only covering an angle range of ±5°, making it unsuitable for scientific research experiments involving large divergence angles of up to 180°. Therefore, developing a glass chamber with a large receiving angle (wide-angle) suitable for SEOP technology is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a glass gas cell, its preparation method, and its application. The glass gas cell has a large receiving angle and can be used in scientific research experiments that emit neutrons with a large divergence angle spanning up to 180°.

[0005] The first aspect of this application provides a method for preparing a glass gas chamber, comprising: steps for preparing an inner core prototype and an outer shell prototype: fixing a hollow glass tube on a processing device; softening, expanding, and flattening a portion of the glass tube to increase the diameter of the softened portion, resulting in a first expanded tube segment with a first cylinder; preparing a second expanded tube segment with a second cylinder using the same method, the difference being that the diameter of the second cylinder is larger than the diameter of the first cylinder, and the height of the second cylinder is smaller than the height of the first cylinder; then radially cutting one end of the curved surface of the first cylinder to obtain an inner core prototype with a first opening; and cutting a circular second opening at the center of the side surface of the second expanded tube segment located on one side of the second cylinder to obtain an outer shell prototype; and steps for preparing the glass gas chamber prototype: first fixing the inner core prototype and the outer shell prototype to both ends of the processing device, with the first opening facing the second opening, and then driving the processing device to make the first opening open from the second... An opening extends into the second cylinder, allowing the first cylinder to penetrate the second cylinder. A glass neck is then welded to the outer surface of the curved surface of the second cylinder. A circular third opening is cut from the center of the side of the second expanding tube section facing away from the second opening, allowing the first opening to extend beyond the third opening, and the first and third openings are sealed. The second cylinder is then fixed to one end of the processing device, and the portion of the inner core prototype removed from the first cylinder is cut off to obtain a first cylinder with a fourth opening. The second and fourth openings are sealed to obtain a ring-shaped glass chamber prototype. The glass chamber preparation steps are as follows: First, the glass chamber prototype is fixed to the processing device, and air is introduced into the glass chamber prototype from the glass neck. Then, the position of a single diameter of the glass chamber prototype is softened, and the processing device is driven to move the glass chamber prototypes on both sides of the diameter away from each other until the softened portion shrinks and closes, separating into two independent halves. The glass chamber preparation is thus completed.

[0006] In this application, a ring-shaped glass chamber prototype is obtained by interlocking a first cylinder and a second cylinder, and then sintering together a first opening and a third opening, and a second opening and a fourth opening. The prototype is then softened and separated along one diameter of the ring-shaped glass chamber prototype to obtain a semi-ring-shaped glass chamber prototype. This preparation method is simple and economical, and the resulting glass chamber has a large receiving angle, making it suitable for SEOP technology and applicable to scientific research experiments involving neutron emission with a large divergence angle of up to 180°.

[0007] In one embodiment, during the preparation steps of the inner core prototype and the outer shell prototype, in the first expansion tube section, the outer diameter of the first cylinder is 5.8 cm, the axial height is 7-8 cm, and the wall thickness is 4 mm; in the second expansion tube section, the outer diameter of the second cylinder is 10 cm, the axial height is 3-4 cm, and the wall thickness is 4 mm; or, the diameters of the second opening and the fourth opening are 6 cm.

[0008] Because the first cylinder needs to penetrate the second cylinder from within, and both ends of the first cylinder extend beyond the second cylinder, the outer diameter of the first cylinder is smaller than the outer diameter of the second cylinder, and the axial height of the first cylinder is greater than the axial height of the second cylinder. Furthermore, the dimensions of the first and second cylinders can be adjusted appropriately depending on the size of the glass chamber to be prepared.

[0009] In one embodiment, during the glass chamber prototype preparation step, after sealing the first and third openings, the second cylinder is fixed to one end of the processing device by a support member. Then, the rotation function of the processing device is activated, and the support member drives the first and second cylinders to rotate around the axial direction. Then, the portion of the inner core prototype that removes the first cylinder is cut off to obtain a first cylinder with a fourth opening. The support member has a fixed glass tube, which is a hollow structure with openings at both ends. One end of the fixed glass tube is fused to the glass neck, and the other end is fixed to the processing device.

[0010] In this application, the portion of the inner core prototype to remove the first cylinder needs to be cut off under rotation. The second cylinder is then fixed to one end of the processing device using a support member. Since the first and third openings are sealed, the first cylinder is also fixed when the second cylinder is fixed. Furthermore, this application requires the use of a hollow fixed glass tube to weld the glass neck. Using a solid glass rod could potentially block the glass neck.

[0011] In one embodiment, during the glass chamber prototype preparation step, after the glass neck is sintered onto the outer surface of the curved surface of the second cylinder, one end of a connecting glass tube is sintered onto the glass neck. Then, the connecting glass tube is softened, and the other end is sintered onto the glass tube on the inner core prototype other than the first cylinder. Then, the connecting glass tube is cooled to fix the relative positions of the outer shell prototype and the inner core prototype.

[0012] In this application, by softening the connecting glass tube, the glass neck and the inner core prototype are connected together, so as to fix the relative positions of the outer shell prototype and the inner core prototype. This ensures that the inner core prototype and the outer shell prototype will not move relative to each other when the third opening is cut, thus affecting the cutting effect.

[0013] In one embodiment, in the preparation steps of the inner core prototype and the outer shell prototype, a circular second opening is formed at the center of the side of the second expansion tube section located on one side of the second cylinder using a flame temperature of 1500°C, thereby obtaining the outer shell prototype; and / or, in the preparation step of the glass chamber prototype, a circular third opening is formed at the center of the side of the second expansion tube section opposite to the second opening using a flame temperature of 1500°C.

[0014] The second and third incisions are burned at higher temperatures to ensure that the excision is completed quickly and with high quality, and to avoid deformation of the incision site.

[0015] In one embodiment, a cleaning step is included before the preparation steps of the inner core prototype and the outer shell prototype. The cleaning step includes cleaning the hollow glass tube with hydroxyethylidene diphosphate.

[0016] Hydroxyethylidene diphosphonic acid (HEDP) is used to clean hollow glass tubes used for preparing the inner core and outer shell prototypes. HEDP can form stable complexes with various metal ions such as iron, copper, or zinc, and can be used as a cleaning agent to remove magnetic impurities from the inner surface of the glass chamber, thus preventing problems caused by the presence of magnetic impurities in the finished glass chamber. 3 Degradation of He polarizability.

[0017] The second aspect of this application provides a glass gas chamber prepared using the preparation method of the first aspect.

[0018] In one embodiment, it includes: a body in the shape of a semi-circular ring, with a connecting hole on the outer surface of the body opposite to the center of the semi-circular ring; the body is used to store alkali metals and 3 He gas; glass neck, a hollow structure with openings at both ends, with one end of the glass neck connected to a connecting hole.

[0019] The glass gas cell provided in this application has a semi-circular ring shape as its main structure, and its horizontal coverage angle can reach 180° when placed horizontally, which can meet the needs of neutron scattering experiments that require large scattering angle neutron polarization analysis. In contrast, the horizontal coverage angle of ordinary cylindrical glass gas cells is only 5-10° when placed horizontally, and they are generally only suitable for polarization analysis of emitted neutrons in neutron scattering experiments with small scattering angles.

[0020] In one embodiment, the connecting hole is located at the middle position of the outer surface of the body away from the center of the ring; or, the inner diameter of the middle position of the glass neck is smaller than the inner diameter of the two ends of the glass neck.

[0021] It should be noted that the connecting hole does not necessarily have to be located in the middle of the outer surface of the main body away from the ring center, but the hole position of the glass neck must avoid the neutron flight path to prevent interference with the neutron polarization analysis results. That is, when the neutron flight path is horizontal, the glass cell is placed horizontally, and the glass neck hole position must be located above or below the outer surface of the glass cell to avoid generating additional polarization interference to the neutrons passing through the main body of the glass cell.

[0022] A third aspect of this application provides a glass gas cell in neutron polarization 3 In the application of He gas, the glass chamber is prepared by the preparation method of the first aspect; or, the glass chamber is the glass chamber of the second aspect.

[0023] This application provides a glass chamber, its preparation method, and its application, including steps for preparing an inner core prototype and an outer shell prototype, a glass chamber prototype preparation step, and a glass chamber preparation step. First, an inner core prototype and an outer shell prototype are prepared. The inner core prototype includes a first cylinder with a first opening, and the outer shell prototype includes a second cylinder with a second opening. Then, the inner core prototype and the outer shell prototype are fixed on a processing device, with the first opening facing the second opening. The processing device is driven to allow the first cylinder to penetrate the second cylinder, sealing the first and third openings. Next, a third opening is cut off from the side of the outer shell prototype facing away from the second opening. Then, the portion of the inner core prototype excluding the first cylinder is cut off, resulting in a first cylinder with a fourth opening. The second and fourth openings are then sealed, obtaining the glass chamber prototype. Finally, the glass chamber prototype is softened and separated at the position of a single diameter, resulting in a semi-circular glass chamber. In this application, a semi-circular glass chamber is obtained by interlocking, sealing, and softening two cylindrical structures. The preparation method is simple and economical, and the resulting glass gas cell has a large receiving angle, which can be applied to scientific research experiments that emit neutrons at a large divergence angle of up to 180°. Attached Figure Description

[0024] Figure 1 This is a process flow diagram for the fabrication of the glass gas chamber in this application;

[0025] Figure 2 This is a structural schematic diagram of the first expanded pipe section of this application;

[0026] Figure 3 This is a structural schematic diagram of the prototype of the inner core in this application;

[0027] Figure 4 This is a schematic diagram of the structure of the second expanded pipe section of this application;

[0028] Figure 5 This is a schematic diagram of the structure of the second expanded pipe section with the second opening removed in this application;

[0029] Figure 6 This is a schematic diagram of the structure in this application in which the first cylinder penetrates the second cylinder;

[0030] Figure 7 This is a schematic diagram of the structure in this application that connects the inner core prototype and the second cylinder via a connecting glass tube;

[0031] Figure 8 This is a schematic diagram of the structure in this application where a third opening is cut out on the second expanded pipe section;

[0032] Figure 9 This is a schematic diagram of the structure after the first opening and the third opening are sealed together in this application;

[0033] Figure 10 This is a schematic diagram of the structure for fixing the second cylinder to the support member;

[0034] Figure 11 This is a schematic diagram of the structure with the fourth opening cut out in this application;

[0035] Figure 12 This is a schematic diagram of the prototype of a glass air chamber;

[0036] Figure 13 A schematic diagram of a structure that softens and shrinks one diameter section of the prototype glass air chamber;

[0037] Figure 14 This is a schematic diagram of the glass air chamber in Embodiment 2 of this application.

[0038] Reference numerals: First glass tube - 10, Second glass tube - 20, First expanding tube section - 30, First cylinder - 31, First opening - 32, Inner core prototype - 33, Fourth opening - 34, Second expanding tube section - 40, Second cylinder - 41, Second opening - 42, Outer shell prototype - 43, Connecting hole - 44, Third opening - 45, Glass neck - 50, Connecting glass tube - 60, Support member - 70, First solid glass rod - 71, First hollow glass tube - 72, Glass air chamber prototype - 80, Glass air chamber - 90, Main body - 91. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0040] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0041] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0042] Example 1

[0043] This embodiment provides a method for preparing a glass gas chamber 90. Please refer to [the relevant documentation]. Figure 1 The preparation method of the glass gas chamber 90 includes the following steps:

[0044] Glass tube preparation steps: Select two hollow first glass tubes 10 and two hollow second glass tubes 20. The outer diameter of each first glass tube 10 is 12mm, the wall thickness is 1.5mm, and the length is 35cm. The outer diameter of each second glass tube 20 is 15mm, the wall thickness is 1.5mm, and the length is 85cm. Both ends of the first glass tube 10 are open, and one end of the second glass tube 20 is open and the other end is closed.

[0045] Glass tube cleaning steps: Clean the first glass tube 10 and the second glass tube 20 with hydroxyethylidene diphosphonic acid.

[0046] Preparation steps of the inner core prototype 33: First, install a first glass tube 10 and a second glass tube 20 at opposite ends of the glass lathe and fix them with three-jaw pliers. Insert the opening of the first glass tube 10 into the air inlet of the glass lathe. Connect the opening of the second glass tube 20 with the opening of the first glass tube 10 away from the air inlet. The axis of the first glass tube 10 and the axis of the second glass tube 20 are on the same straight line, which is the first axis line. Then, activate the rotation function of the glass lathe, causing the first glass tube 10 and the second glass tube 20 to rotate along the first axis at a speed of 30 r / min. Use a flame gun at 1200-1400℃ to fuse the junction of the first glass tube 10 and the second glass tube 20. Then, use a flame at 1400℃ to soften this junction. Simultaneously with fusion and softening, blow air into the glass lathe through its air inlet to expand the softened area and increase its diameter. After the diameter expands, activate the movement function of the glass lathe to move the second glass tube 20 towards the first glass tube 10, thus accumulating material in the softened section and ensuring sufficient glass material for expansion. During this process, hold a graphite plate under the softened and expanded glass tube while simultaneously blowing air into the first glass tube 10 and the second glass tube 20 through the air inlet, causing the expanded glass tube section to contact the graphite plate. Driven by the rotation of the glass lathe, the graphite plate flattens the expanded glass tube section (the flame should be briefly turned off during this flattening process). Figure 2As shown, a first expanded tube section 30 with a first cylinder 31 is prepared, and then firing is stopped. The first cylinder 31 has an axial height of 7-8 cm, an outer diameter of 5.8 cm, and a thickness of 4 mm. The first expanded tube section 30 is heated entirely using a 1400°C flame from a glass lathe torch, and the flame temperature is uniformly reduced at a rate of 150°C / min until the flame is insufficient to cover the entire first expanded tube section 30. The glass lathe torch is then extinguished (this step aims to achieve a slow and uniform cooling of the first expanded tube section 30, avoiding glass tube bursting due to excessively rapid temperature drop). After the first expanded tube section 30 has cooled naturally, it is removed from the glass lathe, and then a diamond wheel glass cutting machine is used to radially cut one end of the curved surface of the first cylinder 31, as shown. Figure 3 As shown, a core prototype 33 with a first opening 32 is obtained.

[0047] Preparation steps for the outer shell prototype 43: The second expanded tube section 40, having a second cylinder 41, is then prepared using the same method as the preparation of the first expanded tube section 30. Figure 4 As shown, in the second expanded tube section 40, the second cylinder 41 has an axial height of 3-4 cm, an outer diameter of 10 cm, and a thickness of 4 mm. While keeping the second expanded tube section 40 rotating on a glass lathe at a speed of 30 r / min, a bright blue, sharp, oxygen-rich flame at 1500℃ is used to burn a circular second opening 42 at the center of the side of the second cylinder 41 on one side of the second expanded tube section 40. Figure 5 As shown, the diameter of the second opening 42 is 6cm, resulting in a shell prototype 43. The shell prototype 43 is then heated with a 1400℃ flame from a lathe flame gun, and the flame temperature is uniformly reduced at a rate of 150℃ / min until the flame is insufficient to cover the entire shell prototype 43. The glass lathe flame gun is then extinguished. After the cut-off glass portion, which is positioned opposite the second opening 42, has cooled naturally, the glass lathe is stopped from rotating, and the glass portion is removed from the glass lathe three-jaw chuck.

[0048] Integration steps of the inner core prototype 33 and outer shell prototype 43: First, fix the inner core prototype 33 and outer shell prototype 43 to both ends of the glass lathe, with the first opening 32 facing the second opening 42. Then, drive the glass lathe to move the inner core prototype 33, so that the first opening 32 extends into the second cylinder 41 from the second opening 42, and the first cylinder 31 penetrates the second cylinder 41 (e.g., ...). Figure 6 As shown), the first opening 32 extends 0.5-1cm beyond the second cylinder 41.

[0049] Glass necking 50 welding procedure: First, use a flame torch at 1300℃ to burn a 12mm diameter connecting hole 44 on the outer surface of the curved surface of the second cylinder 41. Then, use a flame torch at 1200℃ to weld the pre-fired glass necking 50 to the connecting hole 44 (e.g., Figure 7 (As shown), and then use a flame gun at 1300℃ to perform fine welding on the weld joint.

[0050] Steps for fixing the inner core prototype 33 and the outer shell prototype 43: (e.g.) Figure 7 As shown, another connecting glass tube 60 is then taken, and one end of the connecting glass tube 60 is welded to the glass neck 50 with a flame at 1200°C. The connecting glass tube 60 is then softened with a flame at 1000°C, and the other end is welded to the glass tube on the inner core prototype 33 (excluding the first cylinder 31) under a flame at 1200°C. Then, the welded joint is finely welded with a flame at 1300°C, and the connecting glass tube 60 is cooled to fix the relative positions of the outer shell prototype 43 and the inner core prototype 33.

[0051] Sealing steps for the first opening 32 and the third opening 45: Then, the integrated outer shell prototype 43 and inner core prototype 33 are rotated on a glass lathe at a speed of 30 r / min around the first axis. Next, using a flame gun, a circular third opening 45 with a diameter of 6 cm is created on the center of the side of the second expansion tube section 40 away from the second opening 42 using a flame of 1500℃. Figure 8 As shown, the first opening 32 extends beyond the third opening 45. Then, the glass lathe is driven to move the cut-off second expansion tube section 40, which is positioned opposite the third opening 45, away from the third opening 45. After the cut-off portion cools, it is removed from the glass lathe. Then, a handheld flame gun is used to seal the first opening 32 and the third opening 45 with a flame of 1200°C (as shown). Figure 9 (As shown), then use the 1200℃ flame of the glass lathe to heat the remaining glass components on the glass lathe, and reduce the flame temperature at a uniform rate of 150℃ / min until the flame is insufficient to cover the entire glass component, then extinguish the glass lathe flame.

[0052] Preparation steps for the glass chamber prototype 80: Then, using a flame gun at 1300℃, burn off the joint connecting the glass tube 60 and the inner core prototype 33. Next, remove the glass device, including the second cylinder 41 and the first cylinder 31, from the glass lathe, and use a stainless steel knife to cut off the joint connecting the glass tube 60 and the glass necking 50. Then, remove the connecting glass tube 60 from the glass device. Then... Figure 10The first solid glass rod 71 of the support member 70 is inserted into a three-jaw chuck at one end of the glass lathe and fixed thereon. The end of the inner core 33 away from the second cylinder 41 is fixed to a three-jaw chuck at the other end of the glass lathe. One end of the first hollow glass tube 72 of the support member 70 is connected to the air inlet of the glass lathe. A flame gun is used to fuse the other end of the first hollow glass tube 72 to the glass necking 50 using a flame of 1200°C. Then, a fine weld is performed using a flame of 1300°C. The glass lathe is then driven to rotate the integrated support member 70 and the glass device at a speed of 30 r / min. A bright blue, oxygen-rich flame of 1500°C is used to cut off the portion of the inner core 33 excluding the first cylinder 31 (e.g.,...). Figure 11 As shown, a first cylinder 31 with a fourth opening 34 is obtained. The glass lathe is driven to move the cut-off part away from the first cylinder 31. Then, a flame gun is used to seal the second opening 42 and the fourth opening 34 with a flame of 1200°C. After that, the remaining glass device on the glass lathe is heated with the 1200°C flame of the glass lathe head, and the flame temperature is reduced at a constant rate of 150°C / min until the flame is insufficient to cover the entire glass device. The glass lathe head is then extinguished. The glass lathe is then driven to stop rotating. The support 70 and the glass device are then removed from the glass lathe. A stainless steel knife is then used to cut the joint between the first hollow glass tube 72 of the support 70 and the glass neck 50. At this point, a circular glass chamber prototype 80 is obtained. Please refer to [reference needed]. Figure 12 .

[0053] Preparation steps of glass air chamber 90: First, use a flame gun to weld a hollow glass tube to one end of glass neck 50 at 1200℃. Then, use a flame at 1300℃ to perform fine welding on the welded joint. Next, insert the other end of the hollow glass tube into the air inlet of the glass lathe and fix it with three-jaw pliers. Then, use the three-jaw pliers on the other end of the glass lathe to clamp the other end of the annular glass air chamber prototype 80 opposite to the glass neck 50. Then, drive the glass lathe to rotate the annular glass chamber 90 at a speed of 30 r / min. Next, use the 1400℃ flame from the glass lathe's burner to soften a section of the annular glass chamber prototype 80 along one of its diameters (this diameter divides the annular glass chamber prototype 80 into two equal halves and is perpendicular to the axis of the glass neck 50). Then, drive the glass lathe to slowly move the half of the annular glass chamber prototype 80 without the glass neck 50, causing the two halves to move away from each other, gradually shrinking and closing the softened area (please refer to...). Figure 13The glass is drawn apart and broken into two completely separated glass chamber prototypes 80. During this process, air needs to be continuously introduced into the glass chamber prototypes 80 through the air inlet of the glass lathe to maintain the uniformity of the fracture surface morphology and wall thickness of the broken part. After the breakage is completed, the semi-circular glass chamber prototypes 80 with glass necking 50 are heated by the 1400℃ flame of the glass lathe burner, and the flame temperature is uniformly reduced at a rate of 150℃ / min until the flame is insufficient to cover the entire semi-circular glass chamber prototypes 80. Then the glass lathe burner is extinguished, thus completing the glass chamber 90 (e.g., ...). Figure 14 The glass gas chamber 90 has an outer diameter of 100 mm, an inner diameter of 50 mm, a horizontal coverage scattering angle of 180°, a height of 50 mm, and an average sidewall thickness of 4 mm.

[0054] The preparation method used in this embodiment is simple and economical.

[0055] Example 2

[0056] This embodiment provides a glass gas chamber 90, which is prepared using the preparation method described in Example 1. Please refer to... Figure 14 The glass air chamber 90 includes a main body 91 and a glass neck 50.

[0057] Please refer to Figure 14 The main body 91 is semi-circular in shape, and the outer surface of the main body 91 away from the center of the semi-circular ring has a connecting hole 44. The main body 91 is used to store alkali metals and 3 He gas. The glass neck 50 is a hollow structure with openings at both ends, and one end of the glass neck 50 is connected to the connecting hole 44. The connecting hole 44 is located at the middle position of the outer surface of the main body 91 away from the annular center. The inner diameter of the middle position of the glass neck 50 is smaller than the inner diameter of the two ends of the glass neck 50.

[0058] The glass gas chamber 90 in this embodiment can withstand a high pressure of 3.5 bar. Furthermore, it can be applied to scientific research experiments involving neutron emission with a large divergence angle spanning up to 180°.

[0059] Example 3

[0060] Neutron polarization 3 When using He gas, the glass gas chamber 90 in Example 2 is used to store alkali metals and... 3 He gas.

[0061] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A method for preparing a glass gas chamber, characterized in that, include: Preparation steps for the inner core prototype and outer shell prototype: A hollow glass tube is fixed on a processing device. A portion of the glass tube is softened, expanded, and flattened to increase the diameter of the softened portion, resulting in a first expanded tube segment with a first cylinder. A second expanded tube segment with a second cylinder is prepared using the same method, except that the diameter of the second cylinder is larger than that of the first cylinder, and the height of the second cylinder is smaller than that of the first cylinder. Then, the curved end of the first cylinder is radially cut to obtain an inner core prototype with a first opening. A circular second opening is cut at the center of the side of the second expanded tube segment located on one side of the second cylinder to obtain an outer shell prototype. Steps for preparing a glass gas chamber prototype: First, fix the inner core prototype and the outer shell prototype to both ends of the processing device, and make the first opening face the second opening. Then drive the processing device so that the first opening extends into the second cylinder from the second opening and the first cylinder penetrates the second cylinder. Then, weld a glass neck onto the outer surface of the curved surface of the second cylinder. Then, cut a circular third opening from the center of the side of the second expansion tube section away from the second opening, so that the first opening extends out of the third opening, and seal the first opening and the third opening. Then, the second cylinder is fixed to one end of the processing device, and the part of the inner core prototype that removes the first cylinder is cut off to obtain a first cylinder with a fourth opening; the second opening and the fourth opening are sealed to obtain a ring-shaped glass air chamber prototype. Glass chamber preparation steps: First, fix the glass chamber prototype on the processing device, and then breathe into the glass chamber prototype from the glass neck. Then, soften the position of a single diameter of the glass chamber prototype, and drive the processing device to move the glass chamber prototype on both sides of the diameter in a direction away from each other until the softened part shrinks and closes, separating into two independent halves. At this point, the glass chamber preparation is complete.

2. The preparation method according to claim 1, characterized in that, In the preparation steps of the inner core prototype and the outer shell prototype, in the first expansion tube section, the outer diameter of the first cylinder is 5.8 cm, the axial height is 7-8 cm, and the wall thickness is 4 mm; in the second expansion tube section, the outer diameter of the second cylinder is 10 cm, the axial height is 3-4 cm, and the wall thickness is 4 mm. Alternatively, the diameter of the second opening and the fourth opening is 6 cm.

3. The preparation method according to claim 1, characterized in that, In the glass chamber prototype preparation step, after sealing the first opening and the third opening, the second cylinder is fixed to one end of the processing device by a support member. Then, the rotation function of the processing device is activated, and the support member drives the first cylinder and the second cylinder to rotate around the axis. Then, the part of the inner core prototype that removes the first cylinder is cut off to obtain a first cylinder with a fourth opening. The support member has a fixed glass tube, which is a hollow structure with openings at both ends. One end of the opening is fused to the glass necking, and the other end is fixed to the processing device.

4. The preparation method according to claim 1, characterized in that, In the glass chamber prototype preparation step, after the glass neck is welded to the outer surface of the second cylindrical curved surface, one end of a connecting glass tube is welded to the glass neck. Then, the connecting glass tube is softened and the other end is welded to the glass tube on the inner core prototype other than the first cylinder. Then, the connecting glass tube is cooled to fix the relative positions of the outer shell prototype and the inner core prototype.

5. The preparation method according to claim 1, characterized in that, In the preparation steps of the inner core prototype and the outer shell prototype, a circular second opening is burned out at the center of the side of the second expansion tube section located on one side of the second cylinder using a flame temperature of 1500°C to obtain the outer shell prototype. And / or, in the glass chamber prototype preparation step, a circular third opening is formed at the center of the side of the second expansion tube section opposite to the second opening by using a flame temperature of 1500°C.

6. The preparation method according to claim 1, characterized in that, Before the preparation steps of the inner core prototype and the outer shell prototype, a cleaning step is also included, which includes cleaning the hollow glass tube with hydroxyethylidene diphosphate.

7. A glass air chamber, characterized in that, It is prepared by the preparation method according to any one of claims 1-6.

8. The glass air chamber as described in claim 7, characterized in that, include: The main body is in the shape of a semi-circular ring, and the outer surface of the main body opposite to the center of the semi-circular ring has a connecting hole; the main body is used to store alkali metals and 3 He gas; The glass neck is a hollow structure with openings at both ends, and the opening at one end of the glass neck is connected to the connecting hole.

9. The glass air chamber as described in claim 8, characterized in that, The connecting hole is located at the middle position on the outer surface of the main body away from the center of the ring; Alternatively, the inner diameter at the middle position of the glass neck is smaller than the inner diameter at both ends of the glass neck.

10. A glass gas cell in neutron polarization 3 Its application in He gas is characterized by... The glass gas chamber is prepared by the preparation method according to any one of claims 1-6; or, the glass gas chamber is the glass gas chamber according to any one of claims 7-9.

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