Search

CN-116033641-B - Radial-extraction penning ion source neutron tube structure with adjustable accelerator

CN116033641BCN 116033641 BCN116033641 BCN 116033641BCN-116033641-B

Abstract

The adjustable radial-extraction penning ion source neutron tube structure of an accelerator comprises a sleeve, wherein one end of the inside of the sleeve is provided with an anode tube, an insulator is embedded outside the tube body of the anode tube, radial extraction holes are formed in the side edges of the anode and the insulator, an accelerator tube is coaxially arranged outside the radial extraction holes and the insulator, and the tail end of the accelerator tube is provided with a copper target; when the device is used, the nut is adjusted, the corrugated telescopic tube is stretched or compressed, the distance between the accelerating tube and the discharge cavity is adjusted, then an external circuit applies voltage to the anode tube, gas is ionized under the combined action of an electric field and a magnetic field to generate ions, the ions are led out through the radial leading-out holes, positive high pressure is applied to the accelerating tube at the moment, the ions are accelerated and led out, and neutrons are generated on a copper target; according to the invention, the radial extraction holes are arranged, and the corrugated telescopic pipes are arranged around the accelerating cylinder, so that ions are easier to extract, the accelerating performance is improved, the area of the ion beam on the copper target is controlled, the utilization rate of the copper target is improved, and the neutron yield is improved.

Inventors

  • ZHOU XIAOHUA
  • Lian Baiwan
  • LU JIE
  • YUE AIZHONG
  • LI RUSONG
  • HUO GE
  • OUYANG XIAOPING

Assignees

  • 西京学院

Dates

Publication Date
20260512
Application Date
20230109

Claims (7)

  1. 1. The utility model provides a radial extraction penning ion source neutron tube structure with adjustable accelerating pole, includes sleeve (5), its characterized in that, the inside one end of sleeve (5) is furnished with positive pole section of thick bamboo (4), the stack shell outside of positive pole section of thick bamboo (4) has inlayed insulator (11), first radial extraction hole (15) have been seted up to the intermediate position of positive pole section of thick bamboo (4) stack shell, second radial extraction hole (18) have been seted up on the same position of insulator (11) side and first radial extraction hole (15), the outside and insulator (11) coaxial acceleration section of thick bamboo (12) that are equipped with of second radial extraction hole (18), copper target (14) are furnished with at the tail end of acceleration section of thick bamboo (12); An upper cathode (3), an upper permanent magnet (2) and an upper gasket (1) are sequentially arranged at the top end of the anode cylinder (4), and a lower cathode (10), a lower permanent magnet (9) and a lower gasket (8) are sequentially arranged at the bottom end of the anode cylinder (4); The accelerating cylinder (12) is arranged on a supporting frame (17) arranged at the other end of the sleeve (5), the inner side of the supporting frame (17) is connected with one end of a corrugated telescopic pipe (13), the other end of the corrugated telescopic pipe (13) is connected with the inner side of a flange (16), and the flange (16) is fixed at one end of the sleeve (5) through a screw rod (6) and a nut (7); The sleeve (5), the first radial leading-out hole (15), the second radial leading-out hole (18), the flange (16), the accelerating barrel (12) and the copper target (14) are coaxial.
  2. 2. The accelerating pole adjustable radial extraction penning ion source neutron tube structure according to claim 1, wherein the diameters of the first radial extraction hole (15) and the second radial extraction hole (18) are the same.
  3. 3. The adjustable radial-extraction penning ion source neutron tube structure of claim 1, wherein two ends of the corrugated telescopic tube (13) are respectively welded with a flange (16) and a supporting frame (17) in a sealing manner, and the tail end of the accelerating tube (12) is welded with the flange (16) in a sealing manner.
  4. 4. The adjustable radial-extraction penning ion source neutron tube structure of claim 1, wherein the accelerating tube (12) and the copper target (14) are fixed through threads, and a gap is formed between the head end of the accelerating tube (12) and the supporting frame (17).
  5. 5. The adjustable radial extraction penning ion source neutron tube structure of claim 1, wherein the insulator (11) is made of ceramic material, and the upper gasket (1) and the lower gasket (8) are made of rubber material.
  6. 6. The adjustable radial-extraction penning ion source neutron tube structure of claim 1, wherein the corrugated telescopic tube (13) is made of aluminum, the sleeve (5) and the nut (7) are made of alloy materials, and the flange (16) and the accelerating tube (12) are made of stainless steel materials.
  7. 7. The adjustable radial-extraction penning ion source neutron tube structure according to claim 1, wherein the anode tube (4) and the insulator (11) are coaxial with an upper cathode (3), an upper permanent magnet (2), an upper gasket (1) and a lower cathode (10), a lower permanent magnet (9) and a lower gasket (8) which are arranged at the top end of the anode tube (4) in sequence.

Description

Radial-extraction penning ion source neutron tube structure with adjustable accelerator Technical Field The invention relates to the technical field of neutron tubes, in particular to an accelerator adjustable radial extraction penning ion source neutron tube structure. Background The penning ion source is one of ion sources, generates a large amount of ions in the cavity through the penning effect, can stably discharge under the condition of low air pressure, and has the advantages of simple structure, stable work and the like. The ion source provides ions to be accelerated continuously for the neutron tube accelerator. Neutron tubes are widely applied to petroleum well logging, at present, a mature neutron well logging technology is adopted, ions are provided by an ion source and are accelerated by an acceleration system to obtain high-energy particles, nuclear fusion is carried out on the high-energy particles and target substances to generate 14MeV neutron streams, different nuclear reactions are carried out on the high-energy particles and different substances under the ground, and different gamma rays, characteristic time and energy spectrums are released for distinguishing different substance layers. The utility model provides a "neutron tube structure of toper penning ion source", application number is [ CN202111289817.1] patent application, a neutron tube structure of toper penning ion source is provided, including insulating ceramic cylinder, insulating ceramic cylinder one end is equipped with first permanent magnet, first permanent magnet inboard is fixed with first negative pole through first ceramic ring, first negative pole inboard is connected toper positive pole section of thick bamboo one end, the other end of toper positive pole section of thick bamboo is connected the back and is inlayed in the second ceramic ring jointly with the second negative pole, second negative pole and second ceramic ring outside are connected with the second permanent magnet inboard, it obtains more compact high-efficient miniature ion source through changing the shape of positive pole section of thick bamboo. However, the existing penning ion source neutron tube usually adopts an axial ion extraction mode to perform target shooting, in the process of extracting negative ions, the total neutron yield is not high because the proportion of negative deuterium ions in the source is too low, on the other hand, the ions are accelerated by an accelerating cylinder in the extracting process and are subjected to nuclear reaction on a copper target to generate neutrons, but the distance between an ion source discharge cavity and the accelerating cylinder influences the optical characteristics of an ion beam and the area of the ions on the target to a great extent, so that the intensity of the extracted ion beam and the utilization rate of the copper target are reduced, and the neutron yield is insufficient. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide an accelerating pole adjustable radial extraction penning ion source neutron tube structure, negative ions are more easily extracted by arranging negative ion extraction holes in the radial direction of an anode tube and arranging corrugated telescopic tubes around the accelerating tube, the accelerating performance is improved, the area of an ion beam on a copper target is controlled, the extraction beam intensity of extracted ions is increased, the utilization rate of the copper target in the neutron tube is improved, and the neutron yield is improved. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: The utility model provides a penning ion source neutron tube structure is drawn forth to radial with adjustable accelerating pole, includes sleeve 5, the inside one end of sleeve 5 disposes positive pole section of thick bamboo 4, the outside scarf joint of the stack shell of positive pole section of thick bamboo 4 has insulator 11, first radial hole 15 of drawing forth has been seted up to the intermediate position of positive pole section of thick bamboo 4 stack shell, the second radial hole 18 of drawing forth has been seted up on the same position of insulator 11 side and first radial hole 15 of drawing forth, the outside and the coaxial acceleration section of thick bamboo 12 that is equipped with of insulator 11 of second radial hole of drawing forth 18, acceleration section of thick bamboo 12 tail end disposes copper target 14. The top end of the anode cylinder 4 is sequentially provided with an upper cathode 3, an upper permanent magnet 2 and an upper gasket 1, and the bottom end of the anode cylinder 4 is sequentially provided with a lower cathode 10, a lower permanent magnet 9 and a lower gasket 8. The accelerating cylinder 12 is arranged on a supporting frame 17 arranged at the other end of the sleeve 5, the inner side of the supporting frame 17 is connecte