CN202721106U - Gas discharge type ion source for neutron tube - Google Patents
Gas discharge type ion source for neutron tube Download PDFInfo
- Publication number
- CN202721106U CN202721106U CN 201220234122 CN201220234122U CN202721106U CN 202721106 U CN202721106 U CN 202721106U CN 201220234122 CN201220234122 CN 201220234122 CN 201220234122 U CN201220234122 U CN 201220234122U CN 202721106 U CN202721106 U CN 202721106U
- Authority
- CN
- China
- Prior art keywords
- foam metal
- ion source
- thin plate
- deuterium
- active thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Particle Accelerators (AREA)
Abstract
The utility model provides a gas discharge type ion source for a neutron tube, belonging to the technical field of accelerator. The gas discharge type ion source comprises magnetic steel, a lower cathode plate, an anode tube, an upper cathode plate, a magnetic ring, a foam metal active thin plate and an extraction electrode from bottom to top. When in working, the anode tube, an upper cathode, and a lower cathode (the upper cathode and the lower cathode are in series connection) are externally connected with pulse power supply voltage. The foam metal active thin plate is connected with a lower voltage power supply relative to the upper cathode, and the extraction electrode is externally connected with high voltage pulse power supply relative to a grid electrode. Due to the catalytic action of the foam metal active thin plate, a deuterium molecular ion emitted from the lower cathode is converted into a deuterium atomic ion in foam metal, and after the deuterium atomic ion is accelerated through the extraction electrode, an omegatron mass spectrometer can be used to test the ratio of a deuterium atomic ion beam to a deuterium molecular ion beam. By employing the ion source of the utility model, a high proportion hydrogen (comprising the isotopes deuterium or tritium) atomic ion beam can be outputted from the extraction electrode, the ion source is used in the neutron tube, thus the service life of the neutron tube can be prolonged, and neutron yield is raised.
Description
Technical field
The present invention relates to a kind of gas discharge type ion source, particularly a kind of gas discharge type ion source that is exclusively used in emission mon-H (deuterium, tritium) ion beam belongs to the accelerator art field.
Background technology
Neutron tube is a kind of neutron source of safe and portable, compares with common isotope neutron source, and its power spectrum monochromaticjty is good, and without the γ background and can produce pulsed neutron, the time spent can not turn-off, thus protection easily, storage administration and convenient transportation.Neutron tube all is integrated in ion source, accelerator, target and pressure regulation system in the sealed tube, need not vaccum-pumping equipment and compressed air source unit during work.Neutron tube can be widely used in defence engineering and worker, farming, doctor field, particularly military project and safety inspection field.Use in the open air neutron tube the time, the portability of neutron tube seems even more important, but it is all bulky much to have at present the neutron source of high yield, can only move in the laboratory.
The neutron yield of neutron tube is with wherein critical component--the monatomic ratio with molecular deuterium ions that deuterium ion source produces is relevant, under same accelerating voltage and beam current density, the monatomic deuterium ion ratio that ion source produces is higher, neutron yield is just larger, that is to say that the sensitivity of detection and efficient are also higher.For example, a branch of 50%D that contains
+And 50%D
2 +The neutron yield ratio 100%D that obtains with 100 KeV energy bombardments tritium target of ion beam
+The neutron yield that bundle obtains under same bombarding conditions is low by 48%, i.e. D under this condition
2 +Ion does not almost have and tritium target generation nuclear reaction.The ion source of neutron tube substantially all is based on gas discharge principle at present, and such as penning source, radio-frequency ion source and microwave ion source etc., wherein the penning source accounts for leading.Simple in structure, the advantages such as operating air pressure is low, electric power system is simple, reliable operation that Penning ion source has, but the monatomic ion proportion that its ionization produces is very low, to obtain the high yield neutron in the case, the high line Ions Bombardment target that the penning source must be exported, but this causes again ion sputtering and secondary phenomenon serious, and reason is by H
2 +(/D
2 +) yield of the metal surface secondary electron that causes almost is two times of proton causes under the same energy secondary electron.Although radio-frequency ion source and microwave ion source can produce the monatomic ion of very high ratio, their power-supply system more complicated, debugging difficulty is also larger, and they are bulky, is not suitable for portable neutron tube.
The present invention is based on the advantages such as Penning ion source is simple in structure, operating air pressure is low, electric power system is simple, reliable operation, improve on basis in Penning ion source, and purpose is exactly to overcome the low problem of the intrafascicular atomic ion ratio of this gas discharge type ion source emitting ions.
Summary of the invention
For solving the low problem of Penning ion source outgoing ion beam Atom ion ratio, the present invention has increased the foam active metal in traditional Penning ion source.The effect of foam active metal is to make molecular ion beam be cracked into the atomic ion beam emission under catalytic action.A kind of gas discharge type ion source for neutron tube of the present invention, its structure as shown in Figure 1, comprise from top to bottom magnet steel, lower minus plate, anode canister, upper minus plate and magnet ring, upper minus plate and lower minus plate are positioned over outside the anode canister perpendicular to the anode canister axis, magnet steel and magnet ring are placed near lower minus plate and upper minus plate respectively, upper minus plate has an ion beam fairlead, the axis of ion beam fairlead, the axis of magnet ring and the axis of anode canister are on same straight line, it is characterized in that, also comprise the active thin plate of a foam metal and extraction electrode, after the active thin plate of described foam metal is isolated by an insulating material and magnet ring, be positioned on the magnet ring, its surface is parallel with upper minus plate surface; Described extraction electrode places on the active thin plate of foam metal.
Further, above-mentioned a kind of gas discharge type ion source for neutron tube is characterized in that, the material of the active thin plate of described foam metal is Fe, Co, Ni or Ti.
Further, above-mentioned a kind of gas discharge type ion source for neutron tube is characterized in that, the active gauge of sheet of described foam metal≤10 mm, average pore size 〉=0.2 mm, specific area 〉=250 m
2/ m
3
During work, because magnet steel and magnet ring make anode canister internal magnetic field intensity reach about 600 Gausses, after the gas breakdown, under magnetic field and electric field action, electronics clashes into gas molecule repeatedly so that produce a large amount of molecular ions in the anode canister in anode canister in the anode canister.When passing through reactive metal under bias effect, molecular ion beam launches owing to catalytic action forms atomic ion.Adopt ion source of the present invention to export height ratio hydrogen (comprising its isotope deuterium or tritium) atomic ion beam from extraction electrode, it is used for working life, the raising neutron yield that neutron tube can prolong neutron tube.
Description of drawings
Fig. 1 gas discharge ion source cross-sectional view for neutron tube of the present invention.
Wherein, the mark implication of each accompanying drawing is:
Minus plate, 3-anode canister, the upper minus plate of 4-, 5-magnet ring, 6-insulating material, the active thin plate of 7-foam metal, 8-extraction electrode under 1-magnet steel, the 2-.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail.
Embodiment one:
As shown in Figure 1, a kind of gas discharge type ion source for neutron tube comprises, magnet steel 1, lower minus plate 2, anode canister 3, upper minus plate 4, magnet ring 5, insulating material 6, the active thin plate 7 of Ni foam metal and extraction electrode 8.The active thin plate 7 of Ni foam metal, its thickness is 3 mm, average pore size=0.23 mm, specific area=5800 m
2/ m
3Magnet steel 1 and magnet ring 5 make anode canister internal magnetic field intensity reach 600 Gausses.This ion source is placed in the vacuum chamber, then is filled with deuterium gas and reaches 10 in vacuum chamber
-3-10
-2Pa.During work, connect external power supply.Up and down negative electrode series connection of anode canister 3 and upper negative electrode 4, lower negative electrode 2() an external pulse power voltage 1800-2300 V, supply frequency 10 kHz.Owing to magnetic field and electric field action, electronics clashes into gas molecule repeatedly so that produce a large amount of deuterium molecule ions in the anode canister in anode canister after the gas breakdown.The active thin plate 7 of Ni foam metal connects low-tension supply about-700 V with respect to upper negative electrode, and extraction electrode 8 is with respect to the high-voltage pulse power source more than active thin plate 7 external-10 kV of Ni foam metal.Because the catalytic action of the active thin plate 7 of Ni foam metal, can in foam metal, be transformed into the D-atom ion, available omegatron mass spectrometer test D-atom and molecular ion beam ratio after extraction electrode 8 accelerates from the deuterium molecule ion of lower cathode emission.Test result shows that behind the startup ion source, during without the active thin plate 7 of Ni foam metal, the ratio of the atom of output and molecular ion beam is 1:8; The ratio that adds the active thin plate 7 rear D-atoms of Ni foam metal and molecular ion beam becomes 1:0.6.
Embodiment two:
As shown in Figure 1, a kind of gas discharge type ion source for neutron tube comprises, magnet steel 1, lower minus plate 2, anode canister 3, upper minus plate 4, magnet ring 5, insulating material 6, the active thin plate 7 of Fe foam metal and extraction electrode 8.The active thin plate 7 of Fe foam metal, its thickness is 3 mm, average pore size=0.6 mm, specific area=1500 m
2/ m
3Magnet steel 1 and magnet ring 5 make anode canister internal magnetic field intensity reach 600 Gausses.This ion source is placed in the vacuum chamber, then is filled with deuterium gas and reaches 10 in vacuum chamber
-3-10
-2Pa.During work, connect external power supply.Up and down negative electrode series connection of anode canister 3 and upper negative electrode 4, lower negative electrode 2() an external pulse power voltage 1800-2300 V, supply frequency 10 kHz.Owing to magnetic field and electric field action, electronics clashes into gas molecule repeatedly so that produce a large amount of deuterium molecule ions in the anode canister in anode canister after the gas breakdown.The active thin plate 7 of Fe foam metal connects low-tension supply about-700 V with respect to upper negative electrode, and extraction electrode 8 is with respect to the high-voltage pulse power source more than active thin plate 7 external-10 kV of Fe foam metal.Because the catalytic action of the active thin plate 7 of Fe foam metal, can in foam metal, be transformed into the D-atom ion, available omegatron mass spectrometer test D-atom and molecular ion beam ratio after extraction electrode 8 accelerates from the deuterium molecule ion of lower cathode emission.Test result shows that behind the startup ion source, during without the active thin plate 7 of Fe foam metal, the ratio of the atom of output and molecular ion beam is 1:8; The ratio that adds the active thin plate 7 rear D-atoms of Fe foam metal and molecular ion beam becomes 1:1.
Embodiment three:
As shown in Figure 1, a kind of gas discharge type ion source for neutron tube comprises, magnet steel 1, lower minus plate 2, anode canister 3, upper minus plate 4, magnet ring 5, insulating material 6, the active thin plate 7 of Co foam metal and extraction electrode 8.The active thin plate 7 of Co foam metal, its thickness is 3 mm, average pore size=1.6 mm, specific area=250 m
2/ m
3Magnet steel 1 and magnet ring 5 make anode canister internal magnetic field intensity reach 600 Gausses.This ion source is placed in the vacuum chamber, then is filled with deuterium gas and reaches 10 in vacuum chamber
-3-10
-2Pa.During work, connect external power supply.Up and down negative electrode series connection of anode canister 3 and upper negative electrode 4, lower negative electrode 2() an external pulse power voltage 1800-2300 V, supply frequency 10 kHz.Owing to magnetic field and electric field action, electronics clashes into gas molecule repeatedly so that produce a large amount of deuterium molecule ions in the anode canister in anode canister after the gas breakdown.The active thin plate 7 of Co foam metal connects low-tension supply about-700 V with respect to upper negative electrode, and extraction electrode 8 is with respect to the high-voltage pulse power source more than active thin plate 7 external-10 kV of Co foam metal.Because the catalytic action of the active thin plate 7 of Co foam metal, can in foam metal, be transformed into the D-atom ion, available omegatron mass spectrometer test D-atom and molecular ion beam ratio after extraction electrode 8 accelerates from the deuterium molecule ion of lower cathode emission.Test result shows that behind the startup ion source, during without the active thin plate 7 of Co foam metal, the ratio of the atom of output and molecular ion beam is 1:8; The ratio that adds the active thin plate 7 rear D-atoms of Co foam metal and molecular ion beam becomes 1:1.5.
Embodiment four:
As shown in Figure 1, a kind of gas discharge type ion source for neutron tube comprises, magnet steel 1, lower minus plate 2, anode canister 3, upper minus plate 4, magnet ring 5, insulating material 6, the active thin plate 7 of Ti foam metal and extraction electrode 8.The active thin plate 7 of Ti foam metal, its thickness is 3 mm, average pore size=0.95 mm, specific area=500 m
2/ m
3Magnet steel 1 and magnet ring 5 make anode canister internal magnetic field intensity reach 600 Gausses.This ion source is placed in the vacuum chamber, then is filled with deuterium gas and reaches 10 in vacuum chamber
-3-10
-2Pa.During work, connect external power supply.Up and down negative electrode series connection of anode canister 3 and upper negative electrode 4, lower negative electrode 2() an external pulse power voltage 1800-2300 V, supply frequency 10 kHz.Owing to magnetic field and electric field action, electronics clashes into gas molecule repeatedly so that produce a large amount of deuterium molecule ions in the anode canister in anode canister after the gas breakdown.The active thin plate 7 of Ti foam metal connects low-tension supply about-700 V with respect to upper negative electrode, and extraction electrode 8 is with respect to the high-voltage pulse power source more than active thin plate 7 external-10 kV of Ti foam metal.Because the catalytic action of the active thin plate 7 of Ti foam metal, can in foam metal, be transformed into the D-atom ion, available omegatron mass spectrometer test D-atom and molecular ion beam ratio after extraction electrode 8 accelerates from the deuterium molecule ion of lower cathode emission.Test result shows that behind the startup ion source, during without the active thin plate 7 of Ti foam metal, the ratio of the atom of output and molecular ion beam is 1:8; The ratio that adds the active thin plate 7 rear D-atoms of Ti foam metal and molecular ion beam becomes 1:1.5.
Claims (3)
1. gas discharge type ion source that is used for neutron tube, comprise from top to bottom magnet steel (1), lower minus plate (2), anode canister (3), upper minus plate (4) and magnet ring (5), upper minus plate (4) and lower minus plate (2) are positioned over outside the anode canister (3) perpendicular to the axis of anode canister (3), magnet steel (1) and magnet ring (5) are placed near lower minus plate (2) and upper minus plate (4) respectively, upper minus plate (4) has an ion beam fairlead, the axis of ion beam fairlead, the axis of magnet ring (5), the axis of anode canister (3) is on same straight line, it is characterized in that, also comprise the active thin plate (7) of a foam metal and extraction electrode (8), after the active thin plate of described foam metal (7) is isolated by an insulating material (6) and magnet ring (5), be positioned on the magnet ring, its surface is parallel with upper minus plate (4) surface; Described extraction electrode (8) places on the active thin plate of foam metal (7).
2. a kind of gas discharge type ion source for neutron tube according to claim 1 is characterized in that, the material of the active thin plate of described foam metal (7) is Fe, Co, Ni or Ti.
3. a kind of gas discharge type ion source for neutron tube according to claim 1 is characterized in that, the thickness of the active thin plate of described foam metal (7)≤10 mm, average pore size 〉=0.23 mm, specific area 〉=250 m
2/ m
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220234122 CN202721106U (en) | 2012-05-23 | 2012-05-23 | Gas discharge type ion source for neutron tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220234122 CN202721106U (en) | 2012-05-23 | 2012-05-23 | Gas discharge type ion source for neutron tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202721106U true CN202721106U (en) | 2013-02-06 |
Family
ID=47622918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220234122 Withdrawn - After Issue CN202721106U (en) | 2012-05-23 | 2012-05-23 | Gas discharge type ion source for neutron tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202721106U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709140A (en) * | 2012-05-23 | 2012-10-03 | 四川大学 | Gas discharging type ion source for neutron pipe |
| CN111912237A (en) * | 2020-06-29 | 2020-11-10 | 中国电子科技集团公司第四十八研究所 | Automatic discharging and cleaning device and method for soft magnetic material sintering furnace |
-
2012
- 2012-05-23 CN CN 201220234122 patent/CN202721106U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709140A (en) * | 2012-05-23 | 2012-10-03 | 四川大学 | Gas discharging type ion source for neutron pipe |
| CN111912237A (en) * | 2020-06-29 | 2020-11-10 | 中国电子科技集团公司第四十八研究所 | Automatic discharging and cleaning device and method for soft magnetic material sintering furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Hirsch | Inertial‐electrostatic confinement of ionized fusion gases | |
| US8148922B2 (en) | High-current DC proton accelerator | |
| CN102709140B (en) | Gas discharging type ion source for neutron pipe | |
| CN107567174A (en) | A kind of neutron tube | |
| CN202721106U (en) | Gas discharge type ion source for neutron tube | |
| Liu et al. | Experiment and Operation of BEPC Electron Gun System | |
| Reijonen | Compact neutron generators for medical, home land security, and planetary exploration | |
| Aleinik et al. | Dark currents of a tandem accelerator with vacuum insulation | |
| CN102709139B (en) | Field emission ion source for outputting monatomic hydrogen ion beam | |
| CN204697382U (en) | A kind of pulsed neutron generator | |
| CN202721105U (en) | Field emission ion source used for outputting monatomic hydrogen ion beam | |
| Reijonen et al. | RF ion source development for neutron generation and for material modification | |
| CN104091741A (en) | Multifunctional ion gun | |
| Reijonen et al. | Compact neutron source development at LBNL | |
| Cork | Proton Linear‐Accelerator Injector for the Bevatron | |
| Leung et al. | Compact neutron generator developement and applications | |
| Tian et al. | Prototype of a large neutron detector based on MWPC | |
| Piefer et al. | Progress in the Development of a 3He Ion Source for IEC Fusion | |
| Reijonen et al. | Compact neutron generator development at LBNL | |
| CN106561446A (en) | Microwave source high-density low-energy ion beam biological modification equipment | |
| Williams et al. | Testing of a H2+‐enriched ion source for deuterium simulation | |
| Reijonen et al. | High flux compact neutron generators | |
| Ludewigt | Coaxial mono-energetic gamma generator for active interrogation | |
| Xiao et al. | An ultra-low energy electron beam ion trap in Shanghai | |
| Ciuti | A study of ion beams produced by a duoplasmatron ion source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130206 Effective date of abandoning: 20140917 |
|
| RGAV | Abandon patent right to avoid regrant |