Gas target with fin cooling structure

Abstract

A gas target with a fin cooling structure comprises an outer cylinder, an inner cylinder and a target material cavity, a water outlet and a water inlet are formed in the outer cylinder and the inner cylinder respectively, the target material cavity is located in a cylinder body of the inner cylinder, the cylinder body of the inner cylinder is located in a cylinder body of the outer cylinder, and a plurality of rib plates perpendicular to the outer wall of the target material cavity are evenly distributed on the outer wall of a cavity body of the target material cavity. According to the gas target with the fin cooling structure, the rectangular fin structure is additionally arranged on the outer wall face of the target material cavity, the cooling face is enlarged, the flow speed of cooling water in the cooling channel is increased, therefore, the cooling efficiency is improved, the temperature of a gas target system during reaction is effectively reduced, and compared with a traditional gas target cooling structure, the gas target has a better cooling effect.

Description

Technical Field

[0001] The present invention relates to the technical field of accelerators and target material technology, and in particular to a gas target with a fin cooling structure. Background Art

[0002] Short-lived radioactive isotopes such as 15O, 11C, 13N, and 18F produced by small medical cyclotrons are themselves components of the human body. These nuclides, produced through nuclear reactions within the target, are chemically synthesized into various radiopharmaceuticals in a synthesis module, participating in human metabolism. The gas target is the mechanism that completes the nuclear reaction and produces radionuclides. The beam enters the corresponding target cavity from the cyclotron outlet, bombarding the target nuclei using the corresponding nuclear reaction spectrum to produce specific positron-emitting nuclides. The target system is installed at the accelerator output. The gas target consists of a collimator, a transition flange, a vacuum window, a helium cooling chamber, a target window, a target cavity body, and a water cooling system.

[0003] Conventional target cavities present the following challenges: protons from an accelerator deposit most of their energy into the target as heat, rapidly raising its temperature to hundreds of degrees Celsius or even higher. This can damage the properties and structures of the target sample and its surroundings. The target's thermal properties limit and influence its size and structure, as well as the yield and specific activity of radioisotopes produced using this method.

[0004] Furthermore, conventional gas targets utilize a dual-window model. Rising gas temperature within the target cavity leads to increased pressure within the target cavity. The greater the pressure, the thicker the target film, and the greater the beam loss before reaching the target cavity. Conventional water-cooling systems have a simple structure and poor cooling effectiveness. This slow response time to thermal energy in the gas target system prevents heat from being promptly dissipated through the cooling system, leading to elevated system temperatures and a significant impact on the reaction of the gas target nuclides. Furthermore, conventional water-cooling structures have a slow response time to thermal energy in the gas target system, preventing heat from being promptly dissipated through the cooling system, leading to elevated system temperatures and a significant impact on the reaction of the gas target nuclides. Summary of the Invention

[0005] In order to overcome the defects of the prior art, the present invention discloses a gas target with a fin cooling structure.

[0006] The gas target with a fin cooling structure described in the present invention includes an outer cylinder, an inner cylinder and a target material cavity. The outer cylinder and the inner cylinder are respectively provided with a water outlet and a water inlet. The target material cavity is located in the cylinder body of the inner cylinder, and the cylinder body of the inner cylinder is located in the cylinder body of the outer cylinder. The outer wall of the target material cavity is evenly distributed with multiple ribs perpendicular to the outer wall of the target material cavity, and a diaphragm is fixed on the top of the target material cavity.

[0007] Preferably, one end of the outer cylinder body is provided with a fixing seat for fixing the target material cavity, and the other end is provided with a connecting flange that cooperates with the end flange of the inner cylinder body.

[0008] Preferably, a sealing ring is provided between the end flange and the connecting flange.

[0009] Preferably, the fixing seat is provided with a plurality of threaded holes for connecting with fixing bolts on the collimator.

[0010] Preferably, a diaphragm mounting seat is provided at the top of the target cavity, a beam inlet is provided at the center of the diaphragm mounting seat, and a target inlet and a target outlet communicated with the cavity are provided on the side wall.

[0011] Preferably, a sealing groove surrounding the outer wall of the target cavity is provided at the bottom of the diaphragm mounting seat, and a sealing ring is provided in the sealing groove.

[0012] Preferably, the ribs are rectangular plates made of metal material.

[0013] Preferably, the diaphragm is made of Harvey alloy, the outer cylinder is made of 6061-T6 alloy, and the target cavity is made of high-purity aluminum.

[0014] The gas target with a fin cooling structure described in the present invention adds a rectangular fin structure to the outer wall of the target cavity, thereby increasing the cooling surface and increasing the flow rate of cooling water in the cooling channel, thereby improving the cooling efficiency and effectively reducing the temperature of the gas target system during the reaction. Compared with the traditional gas target cooling structure, it has a better cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a specific embodiment of the various components of the gas target with fin cooling structure of the present invention; Figure 2 for Figure 1 A schematic diagram of the embodiment shown after assembly; Figure 3 This is a schematic diagram of a specific embodiment of the target cavity of the present invention; The reference numerals in the figure are: 1-diaphragm, 2-target cavity, 3-fixing seat, 4-connecting flange, 5-water inlet, 6-water outlet, 7-outer cylinder body, 8-end flange, 9-inner cylinder body, 10-threaded hole, 21-beam inlet, 22-rib, 23-target inlet, 24-target outlet, 25-diaphragm mounting seat. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited to the following embodiments: The gas target with a fin cooling structure described in the present invention includes an outer cylinder, an inner cylinder and a target material cavity 2. The outer cylinder and the inner cylinder are respectively provided with a water outlet 6 and a water inlet 5. The target material cavity is located in the cylinder body of the inner cylinder, and the cylinder body of the inner cylinder is located in the cylinder body of the outer cylinder. The outer wall of the target material cavity is evenly distributed with multiple ribs 22 perpendicular to the outer wall of the target material cavity, and a diaphragm 1 is fixed on the top of the target material cavity.

[0017] Among them, the outer cylinder body 7 is made of 6061-T6 alloy, one end of which is provided with a fixing seat 3 for fixing the target cavity, and the other end is provided with a connecting flange 4 that cooperates with the end flange 8 of the inner cylinder body 9. The outer cylinder and the inner cylinder are fixed together by the connecting flange of the outer cylinder and the connecting flange of the inner cylinder, and the inner cylinder body 9 is located in the outer cylinder body 8. The target cavity is inserted into the inner cylinder body, and the end of the target cavity is fixed in the fixing seat, so that the outer cylinder, the inner cylinder and the target cavity form a whole.

[0018] like Figure 3 As shown, the ribs 22 are evenly arranged on the outer wall of the cylindrical target cavity and are perpendicular to the outer wall of the target cavity. After the target cavity 2, the outer cylinder and the inner cylinder are assembled, during the particle beam bombardment process, the cooling water enters from the water inlet 5 of the inner cylinder and first enters the inner cylinder body 9. The inner cylinder body 9 completely wraps the target cavity 2, so that the cooling water fills the gap between the inner cylinder body 9 and the outer wall of the target cavity 2, and dissipates heat through the ribs 22 densely distributed on the outer wall of the target cavity.

[0019] The cooling water after heat exchange flows out from the opening in front of the inner cylinder body 9, reaches the gap formed between the inner cylinder body 9 and the outer cylinder body 7, and flows out from the water outlet connected to the outer cylinder body. In this way, the inner cylinder body separates the target cavity and the outer cylinder. The inner cylinder body actually forms a heat dissipation structure, which increases the heat dissipation area and guides the cooling water to flow from the water inlet at the bottom of the target cavity to the gap between the inner cylinder and the outer cylinder at the top of the target cavity, cooling and covering the entire height of the target cavity, thereby improving the heat dissipation effect.

[0020] For better sealing, a sealing ring can be provided between the end flange and the connecting flange, such as Figure 3 In the specific embodiment shown, a diaphragm mounting seat 25 is provided at the top of the target cavity, and a beam inlet 21 is provided in the center of the diaphragm mounting seat 25. The diaphragm mounting seat 25 is used to fix the diaphragm 1 that closes the beam inlet, and is provided with a target inlet 23 and a target outlet 24 connected to the cavity.

[0021] The diaphragm 1 can be made of Harvey alloy and is used to seal the vacuum environment, filter low-energy particles, and ensure the purity and efficiency of the nuclide reaction. The target cavity 2 is a reaction cavity made of high-purity aluminum. It is a container for loading the bombarded gas and is the place where the nuclide reaction occurs. Figure 3As shown, before bombardment, the target gas enters from the target inlet 23, and the beam passes through the diaphragm from the beam inlet 21 to bombard the gas target in the target cavity. After the bombardment is completed, the target gas is drawn out from the target outlet 24 for collection.

[0022] Figure 2 In the specific embodiment shown, the fixing seat 3 is provided with a plurality of threaded holes 10 for connecting with the fixing bolts on the collimator, so as to fix the entire device to the collimator of the front-end device and realize the fixation and alignment of the device.

[0023] The gas target with a fin cooling structure described in the present invention adds a rectangular fin structure to the outer wall of the target cavity, thereby increasing the cooling surface and increasing the flow rate of cooling water in the cooling channel, thereby improving the cooling efficiency and effectively reducing the temperature of the gas target system during the reaction. Compared with the traditional gas target cooling structure, it has a better cooling effect.

[0024] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art to which the present invention belongs, other embodiments derived without departing from the technical solution of the present invention should be included in the scope of protection of the present invention.

Claims

1. A gas target with a fin cooling structure, characterized in that: The invention comprises an outer cylinder, an inner cylinder and a target material cavity (2), wherein the outer cylinder and the inner cylinder are respectively provided with a water outlet (6) and a water inlet (5), the target material cavity (2) is located in the inner cylinder body (9), and the inner cylinder body (9) is located in the outer cylinder body (7), and a plurality of ribs (22) perpendicular to the outer wall of the target material cavity are evenly distributed on the outer wall of the target material cavity, and a diaphragm (1) is fixed on the top of the target material cavity.

2. The gas target with a fin cooling structure according to claim 1, characterized in that: One end of the outer cylinder body (7) is provided with a fixing seat (3) for fixing the target cavity (2), and the other end is provided with a connecting flange (4) that cooperates with the end flange (8) of the inner cylinder body.

3. The gas target with a fin cooling structure according to claim 2, characterized in that: A sealing ring is provided between the end flange (8) and the connecting flange (4).

4. The gas target with a fin cooling structure according to claim 2, characterized in that: The fixing seat (3) is provided with a plurality of threaded holes (10) for connection with fixing bolts on the collimator.

5. The gas target with a fin cooling structure according to claim 1, characterized in that: A diaphragm mounting seat (25) is provided at the top of the target cavity (2), a beam inlet (21) is provided at the center of the diaphragm mounting seat, and a target inlet (23) and a target outlet (24) connected to the cavity are provided on the side wall.

6. The gas target with a fin cooling structure according to claim 5, characterized in that: The bottom of the diaphragm mounting seat (25) is provided with a sealing groove surrounding the outer wall of the target cavity, and a sealing ring is provided in the sealing groove.

7. The gas target with a fin cooling structure according to claim 1, characterized in that: The rib plate (22) is a rectangular plate made of metal material.

8. The gas target with a fin cooling structure according to claim 1, characterized in that: The diaphragm is made of Harvey alloy, the outer cylinder is made of 6061-T6 alloy, and the target cavity is made of high-purity aluminum.

Images