阅读说明：本技术 一种小型串列加速器剥离气体输入装置 (Stripping gas input device of small tandem accelerator ) 是由 何明 包轶文 李康宁 赵庆章 游曲波 苏胜勇 张文慧 胡畔 于 2021-06-24 设计创作，主要内容包括：本发明涉及一种小型串列加速器剥离气体输入装置,属于加速器技术领域,包括加速器腔体,加速器腔体内部沿加速器腔体长度方向依次设置有前加速管、气体剥离管和后加速管,加速器腔体外部设置有剥离气体罐和用于调节剥离气体气压的气压调制器,气压调制器一端与剥离气体罐连通,另一端与位于所述加速器腔体内部的石英微孔管连通,石英微孔管另一端连通所述气体剥离管。本发明结构简单、操作方便,通过将剥离气体罐放置在加速器外,避免了经常打开加速器进行剥离罐和剥离气体种类的更换；通过气压调制器将所需压力的剥离气体从地电位输入到高电位,实现剥离气体流量的精确控制。(The invention relates to a stripping gas input device of a small tandem accelerator, belonging to the technical field of accelerators and comprising an accelerator cavity, wherein a front accelerating tube, a gas stripping tube and a rear accelerating tube are sequentially arranged in the accelerator cavity along the length direction of the accelerator cavity, a stripping gas tank and a gas pressure modulator for adjusting the gas pressure of the stripping gas are arranged outside the accelerator cavity, one end of the gas pressure modulator is communicated with the stripping gas tank, the other end of the gas pressure modulator is communicated with a quartz microporous tube positioned in the accelerator cavity, and the other end of the quartz microporous tube is communicated with the gas stripping tube. The invention has simple structure and convenient operation, and avoids the frequent opening of the accelerator to replace the stripping tank and the stripping gas species by placing the stripping gas tank outside the accelerator; the stripping gas with required pressure is input to a high potential from the ground potential through the air pressure modulator, so that the precise control of the flow of the stripping gas is realized.)

1. The utility model provides a gaseous input device is peeled off to small-size tandem accelerator, its characterized in that, includes accelerator cavity (1), accelerator cavity (1) inside has set gradually preceding accelerating tube (2), gaseous peeling tube (3) and back accelerating tube (4) along accelerator cavity length direction, accelerator cavity (1) outside is provided with peeling gas jar (5) and is used for adjusting atmospheric pressure modulator (6) of peeling gas atmospheric pressure, atmospheric pressure modulator (6) one end with peeling gas jar (5) intercommunication, the other end with be located inside quartzy micropore pipe (7) intercommunication of accelerator cavity, quartzy micropore pipe (7) other end with gaseous peeling tube (3) intercommunication, through quartzy micropore pipe (7) will peel off gaseous from the ground potential transport to the high potential, realize peeling gas's input.

2. The strip gas feed device of claim 1, wherein the terminal voltage of the tandem accelerator is less than or equal to 0.5 MV.

3. The compact tandem accelerator stripping gas input device of claim 2, wherein the stripping gas is helium, argon or nitrogen.

4. The stripping gas feed device according to claim 3, characterized in that the gas stripping tube (3) has an internal diameter of 150 μm and a length of 200 mm when the terminal voltage of the tandem accelerator is 0.5 MV.

5. The compact tandem accelerator stripping gas input device according to claim 4, characterized in that the stripping gas pressure is determined based on the terminal voltage of the tandem accelerator, the length and the inner diameter of the gas stripping tube (3).

6. The stripping gas inlet device of a compact tandem accelerator according to any one of claims 1 to 5, wherein the pressure of the stripping gas in the quartz micro-bore tube (7) is controlled within a range of 20 atm to 40 atm so that the stripping gas is not broken down by high pressure and the control of the gas flow rate is achieved.

Technical Field

The invention belongs to the technical field of accelerators, and particularly relates to a stripping gas input device of a small serial accelerator.

Background

The tandem accelerator accelerates negative ions in the front half part of the accelerator, then enters a gas stripping system in the middle of the accelerator to strip the negative ions into positive ions, and then re-accelerates the positive ions by utilizing the rear half part of the accelerator. Therefore, in order to realize gas stripping of ions, a stripping gas is required. The conventional stripping gas input method is to place the tank containing the stripping gas in the high pressure area of the head of the accelerator, and in order to realize the flow control of the stripping gas, an insulating rod is needed to extend from the ground potential to a gas flow control valve at a high potential to control the flow of the gas, as shown in fig. 1. The device needs to open the accelerator shell frequently to replace the stripping tank and the stripping gas, and is inconvenient to operate; meanwhile, the stripping tank is arranged on a high-pressure rack of a high-pressure area of the head of the accelerator, so that the high-pressure rack is large in size and not beneficial to miniaturization.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a stripping gas input device of a small tandem accelerator, which can realize accurate control of stripping gas flow at ground potential rather than high potential, and has simple gas replacement process, thereby ensuring small volume and compact structure of the accelerator.

In order to achieve the above purposes, the invention adopts a technical scheme that:

the utility model provides a small-size tandem accelerator strips gaseous input device, includes the accelerator cavity, inside accelerator cavity length direction of following of accelerator cavity has set gradually first accelerating tube, gaseous tube and the second accelerating tube of peeling off, accelerator cavity outside is provided with peels off the gas jar and is used for controlling the atmospheric pressure modulator that peels off gaseous atmospheric pressure, atmospheric pressure modulator one end with peel off the gas jar intercommunication, the other end with be located the inside quartz micropore pipe intercommunication of accelerator cavity, the quartz micropore pipe other end with gaseous tube intercommunication of peeling off, through quartz micropore pipe will peel off gaseous from the ground potential transport to the high potential, realizes peeling off gaseous input.

Further, according to the stripping gas input device of the small tandem accelerator, the terminal voltage of the tandem accelerator is less than or equal to 0.5 MV.

Further, in the above stripping gas supply device for a compact tandem accelerator, the type of the stripping gas is helium, argon or nitrogen.

Further, in the stripping gas inlet device of the small tandem accelerator, when the terminal voltage of the tandem accelerator is 0.5MV, the inner diameter of the gas stripping pipe is 150 micrometers, and the length of the gas stripping pipe is 200 millimeters.

Further, the small-sized tandem accelerator stripping gas input device as described above determines the gas pressure of the stripping gas based on the terminal voltage of the tandem accelerator, the length and the inner diameter of the gas stripping tube.

Further, in the stripping gas input device of the small tandem accelerator, the pressure of the stripping gas in the quartz microporous tube is controlled within the range of 20 to 40 atmospheres, so that the stripping gas is not broken down by high pressure, and the control of the gas flow is realized.

The stripping gas input device of the small tandem accelerator has the following remarkable technical effects:

1. the stripping gas tank is arranged outside the accelerator, so that the influence on the high-pressure stability of the accelerator caused by the fact that pollution components such as dust and oil stain enter the accelerator in the process of frequently opening the accelerator to replace the stripping tank and stripping gas types is avoided, the gas replacing process is simplified, and the stability and the running timeliness of the accelerator are improved;

2. the stripping gas with required pressure is input to a high potential from the ground potential through the air pressure modulator, so that the precise control of the flow of the stripping gas is realized, and the defect that the precise control of the gas flow is difficult to realize by adjusting the insulating rod by a mechanical means in the prior art is overcome;

3. the stripping gas tank is arranged outside the accelerator, so that the accelerator is more compact in structure, and the floor area and equipment cost of a laboratory can be saved.

Drawings

FIG. 1 is a schematic diagram of a prior art tandem accelerator strip gas input apparatus;

FIG. 2 is a schematic structural diagram of a stripping gas inlet device for a compact tandem accelerator according to an embodiment of the present invention;

wherein, 1-accelerator cavity; 2-a first accelerating tube; 3-gas stripping tube; 4-a second accelerating tube; 5-stripping the gas tank; 6-air pressure modulator; 7-quartz micropore pipe.

Detailed Description

The invention is further described with reference to specific embodiments and drawings attached to the description.

Fig. 2 shows a schematic structural diagram of a stripping gas input device of a small tandem accelerator according to an embodiment of the present invention, and it can be seen from the diagram that the device includes an accelerator cavity 1, a first acceleration tube 2, a gas stripping tube 3, and a second acceleration tube 4 are sequentially disposed inside the accelerator cavity 1 along a length direction of the accelerator cavity, a stripping gas tank 5 and a gas pressure modulator 6 are disposed outside the accelerator cavity 1, one end of the gas pressure modulator 6 is communicated with the stripping gas tank 5, the other end is communicated with a quartz microporous tube 7 located inside the accelerator cavity, and the other end of the quartz microporous tube 7 is communicated with the gas stripping tube 3. The device sends stripping gas with certain pressure in a stripping gas tank into an accelerator cavity 1 through a gas pressure modulator 6, and then conveys the stripping gas from ground potential to a gas stripping pipe 3 positioned in the middle of the accelerator cavity through a quartz micropore pipe 7, so that the stripping gas is input.

In order to avoid the stripping gas from being broken down by high voltage, the pressure of the stripping gas needs to be controlled to be more than 20 atmospheres to meet the insulation requirement. The stripping gas is generally helium, argon or nitrogen, wherein helium is most easily broken down by high voltage. According to the relevant data, for helium, the voltage that can be withstood by the gas stripping tube per mm was 3.2KV when the stripping gas pressure was 20 atm. Therefore, for an accelerator with a terminal voltage of 0.5MV, the length of the gas stripping tube is controlled to be 200 mm, which can meet the requirement.

In order to realize the control of the flow rate of the stripping gas, according to the relevant calculation of the fluid theory, the inner diameter of the gas stripping pipe is 150 microns, the length of the gas stripping pipe is 200 millimeters, the pressure of the stripping gas is controlled under the precondition of 20 to 40 atmospheric pressures, and the pressure of the stripping gas can be adjusted by the pressure modulator 6, so that the requirements of different gas flow rates of the accelerator are realized.

According to the stripping gas input device of the small tandem accelerator, the stripping gas tank is arranged outside the accelerator, so that the situation that the stripping tank is opened frequently and the type of the stripping gas is changed is avoided; the stripping gas with required pressure is input to a high potential from a ground potential through a gas pressure modulator, so that the precise control of the flow of the stripping gas is realized; meanwhile, the stripping tank is not arranged on the high-pressure rack, so that the space size of the high-pressure rack is reduced, and the accelerator is more compact.

The above-described embodiments are merely illustrative of the present invention, which may be embodied in other specific forms or in other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.