CN212517112U - Charged particle beam fairing for a tube - Google Patents

Abstract

The utility model discloses a charged particle beam radome fairing for ray tube, including a connecting plate, be provided with on the connecting plate with charged particle emitter assorted connection structure, the connecting plate is connected with arc reducing ring and is formed cover body structure. The utility model discloses a cover body structure, ray or ion beam that lie in near charged particle emitter in the ray tube space all can direct action on the cover body, through the reflection and the absorption of the cover body, carry out rectification effect with the ascending ray in the not equidirectional, have improved the stability in ray magnetic field, have also reduced bombardment ray and electron simultaneously to the damage at insulating position, have improved the life of ray tube greatly.

Description

Charged particle beam fairing for a tube

Technical Field

The utility model relates to an ionizing radiation irradiation equipment technical field, concretely relates to charged particle beam radome for ray tube.

Background

Vacuum electronic device for generating X-ray by using high-speed electrons to impact metal target surface. The X-ray tube can be classified into a gas tube and a vacuum tube according to the manner of generating electrons. X-ray tube inflatable X-ray tubes were early X-ray tubes. In 1895, X-rays were found in kruse tube experiments performed by w.c. roentgen. Kru (Klu of Kerr Co., Ltd.)The first inflatable X-ray tubes were the gauss tubes. After the tube is connected with high voltage, the gas in the tube is ionized, electrons escape from the cathode under the bombardment of positive ions, and the electrons are accelerated and then impact on a target surface to generate X rays. The inflatable X-ray tube has small power, short service life and difficult control, and is rarely applied later. In 1913, a vacuum X-ray tube was invented by w.d. kuligi. The vacuum degree in the tube is not less than 10^-4And (6) handkerchief. The cathode is a directly-heated spiral tungsten wire, and the anode is a metal target inlaid on the end face of a copper block. The target material and the electron beam energy are chosen according to the use of the tube, tungsten being commonly used as the target material. In some applications, silver, palladium, rhodium, molybdenum, copper, nickel, cobalt, iron, chromium, and the like are also used. The working temperature of the cathode is about 2000K, and emitted electrons are accelerated by tens of thousands to hundreds of thousands of volts and then impact the target surface. The cathode is surrounded by a metal hood which is slotted at the front end. The metal shield is at a potential equal to or lower than the cathode, forcing the electrons to focus in a narrow region on the target surface, forming a focal spot. The X-rays radiate from the focal spot in all directions and exit through a window in the wall of the tube. The window is typically made of beryllium, aluminum, or lightweight glass, with beryllium being the best.

The ray tube has been widely applied in the fields of industry, medical treatment and the like, and has achieved great social and economic benefits. The reliability and radiation uniformity of a tube are important indicators of its performance. On the one hand, a large amount of rays (including primary rays and various secondary rays) generated by the tube during operation can bombard the insulation part of the tube, and the insulation damage can be caused by long-time action, so that the reliability of the tube is seriously affected, such as a large amount of electrons and photons generated by the tube during operation, especially a large-dose tube, and the internal radiation bombardment environment is complicated. On the other hand, the structure of the tube is complicated, so that the electric field distribution in the tube is not uniform, the distribution of charged particle beams is not uniform, the beam target effect is not uniform, and the radiation uniformity of the tube is seriously influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a charged particle beam radome fairing for ray tube, solve among the prior art X ray cause the problem of ray magnetic field unstability, charged particle projecting pole launch angle expansion after bombarding each position in the ray tube, reach restraint angle, increase ray tube life's purpose.

The utility model discloses a following technical scheme realizes:

a charged particle beam fairing for a ray tube comprises a connecting plate, wherein jacks matched with a charged particle emitter are formed in the connecting plate, and the connecting plate is connected with an arc-shaped reducing ring to form a fairing body structure. In the prior art, because in the using process, a large amount of electrons and photons are generated while the generated X-rays are generated, the radiation bombardment environment in the ray tube is very complex, the emitted X-rays, the electrons and the photons are easily acted on an insulating part of a high-voltage socket, long-time primary rays and various secondary rays are bombarded on the insulating part, the insulating property of the insulating part can be damaged, the reliability of the ray tube is seriously influenced, and the multidirectional ray transmission direction also causes poor directionality of the emitted rays and unstable magnetic field, the inventor of the utility model finds that the ray bombardment action is a determining factor for determining the service life of a single ray tube after years of research, finds that the connecting plate is used as a connecting and mounting mechanism of a charged particle emitter by arranging a connecting plate and adopting a mode of arranging an arc reducing ring on the charged particle emitter to form a cover body structure through the research for years, radiation rays such as secondary bombardment rays in a cavity of the ray tube are shielded and reflected for rectification, rays influencing a charged particle emitter are filtered and adjusted in direction, rays positioned near the charged particle emitter in the space of the ray tube can directly act on the cover body through the arrangement of the cover body structure, rays in different directions are rectified through the reflection and absorption of the cover body, the stability of a ray magnetic field is improved, the damage of bombardment rays and electrons to an insulation part is reduced, and the service life of the ray tube is greatly prolonged.

The end part of the arc reducing ring is also provided with a transverse throttling ring. Through setting up a horizontal choke, reflect charged particle emission body axial direction's ray, form axial additional strengthening, be favorable to improving the direction concentration nature of launching the ray.

The length ratio of the transverse throttling ring between the outer side and the inner side of the arc reducing ring is 1: 1.8 to 3. Further, the applicant researches the structure of the transverse throttle ring, and finds that the ratio of the outer side to the inner side of the arc reducing ring actually affects the efficiency of external reflection and ray absorption outside the end part, and finds that the length ratio of the transverse throttle ring at the outer side to the inner side of the arc reducing ring is 1: 1.8 ~ 3 hours, the ray absorption effect in its one side cavity is better, and the ray reflection effect of its opposite side is also best simultaneously, sees from holistic shielding effect and guide effect, and this proportion belongs to the scope of preferred.

And the connecting plate is also provided with an elastic clamping ring matched with the jack. Furthermore, the clamping ring is arranged on the jack, so that the charged particle emitter can be conveniently and quickly inserted and connected, and the assembly, the disassembly and the replacement are convenient.

The surface roughness of the outer side of the cover body structure is Ra0.1, and the surface roughness of the inner side of the cover body structure is Ra0.4. According to actual experimental tests, the applicant finds that the surface finish, namely roughness, of the outer side of the cover body structure has a large influence on the shielding effect of rays, the shielding effect can be greatly improved by setting the roughness of the outer side surface of the cover body to be superior to Ra0.1, the surface finish of the inner part of the cover body is not high, and the conventional requirement can be met when the requirement reaches Ra0.4.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model relates to a charged particle beam fairing for a ray tube, which is characterized in that a connecting plate is arranged, the connecting plate is used as a connecting and installing mechanism of a charged particle emitter component, a mode of arranging an arc reducing ring on the charged particle emitter to connect and form a hood body structure is adopted, radiation rays such as bombardment secondary rays in a ray tube cavity are shielded and reflected and rectified, and an electric field can be adjusted through the change of size and shape, so that rays influencing the charged particle emitter are filtered and the direction is adjusted, through arranging the hood body structure, rays near the charged particle emitter in the ray tube space can directly act on the hood body, rays in different directions are rectified through the reflection and absorption of the hood body, the stability of a ray magnetic field is improved, and the damage of bombardment rays and electrons to an insulating part is reduced simultaneously, the service life of the ray tube is greatly prolonged;

2. the utility model discloses a charged particle beam radome fairing for ray tube is 1 with the length proportion of inboard in the arc reducing ring outside through the research discovery with horizontal restrictor ring: 1.8-3, the absorption effect of the ray in the cavity on one side is better, the reflection effect of the ray on the other side is also best, and the proportion belongs to a better range in terms of the whole shielding effect and the whole guiding effect;

3. the utility model discloses a charged particle beam radome fairing for ray tube sets up to being superior to Ra0.05 through the outside roughness with the cover body, can greatly promote shielding effect, and its inside surface finish degree then not so high requirement, reaches Ra0.4 and both can satisfy conventional demand.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

fig. 1 is a schematic structural diagram of the present invention.

Reference numbers and corresponding part names in the drawings:

1-connecting plate, 2-charged particle emitter component, 3-arc reducing ring, 4-transverse throttling ring and 5-elastic clamping ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail with reference to the following embodiments, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Examples

As shown in fig. 1, the utility model discloses a charged particle beam radome fairing for ray tube, including a connecting plate 1, be provided with on connecting plate 1 with charged particle emitter subassembly 2 assorted connection structure, connecting plate 1 is connected with arc reducing ring 3 and is formed cover body structure, still is provided with a horizontal restrictor ring 4 at the tip of arc reducing ring 3, cover body structure diameter 5 ~ 100mm, high 2 ~ 50mm, thickness 0.5 ~ 5mm, horizontal restrictor ring 4 is 1 with inboard length proportion in the 3 outsides of arc reducing ring: 1.8-3, an elastic clamping ring 5 matched with the jack is further arranged on the connecting plate 1, the cover body structure is effectively connected with a cathode of the ray tube through the charged particle emitter component 2 or other supporting and connecting structures and is at the same potential, the electric field distribution in the ray tube can be adjusted through shape adjustment, the motion trail of a charged particle beam in the tube is adjusted, the action range of a beam target is effectively controlled, the generation range of charged particles and secondary charged particles of the charged particles are controlled, and the reliability and radiation uniformity of the ray tube are improved; the surface roughness of the outer side of the cover body structure is superior to Ra0.1, and the surface roughness of the inner side of the cover body structure is superior to Ra0.4. The cover body structure of the utility model adopts the metal material of single or composite structure, such as single materials of copper, molybdenum, tungsten, aluminum, stainless steel, etc., or adopts sandwich structures of aluminum-lead-aluminum, copper-lead-copper, molybdenum-lead-molybdenum, tungsten-lead-tungsten, etc., and guarantees to have good absorption effect to electrons, photons, ions, etc., and the secondary particles produced simultaneously are less, and have good electric vacuum performance.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (5)

1. A charged particle beam fairing for a tube, comprising: the device comprises a connecting plate (1), wherein a connecting structure matched with a charged particle emitter component (2) is arranged on the connecting plate (1), and the connecting plate (1) is connected with an arc-shaped reducing ring (3) to form a cover body structure.

2. The charged particle beam fairing for a tube as recited in claim 1, wherein: the end part of the arc reducing ring (3) is also provided with a transverse throttling ring (4).

3. The charged particle beam fairing for a tube as recited in claim 2, wherein: the length ratio of the transverse throttling ring (4) between the outer side and the inner side of the arc reducing ring (3) is 1: 1.8 to 3.

4. The charged particle beam fairing for a tube as recited in claim 1, wherein: an elastic clamping ring (5) matched with the jack is also arranged on the connecting plate (1).

5. The charged particle beam fairing for a tube as recited in claim 1, wherein: the surface roughness of the outer side of the cover body structure is Ra0.1, and the surface roughness of the inner side of the cover body structure is Ra0.4.

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