CN105632856A - Small-spot X-ray diode for strengthening pinch focusing by plasmas generated by anode foil - Google Patents
Small-spot X-ray diode for strengthening pinch focusing by plasmas generated by anode foil Download PDFInfo
- Publication number
- CN105632856A CN105632856A CN201610038206.2A CN201610038206A CN105632856A CN 105632856 A CN105632856 A CN 105632856A CN 201610038206 A CN201610038206 A CN 201610038206A CN 105632856 A CN105632856 A CN 105632856A
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- China
- Prior art keywords
- anode
- anode foils
- focal spot
- ray diode
- polycondensation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
Abstract
The invention relates to a magnetic self-focusing X-ray diode with small-spot and large-dose radiation output, in particular to a small-spot X-ray diode for strengthening pinch focusing by plasmas generated by an anode foil. The small-spot X-ray diode comprises a cathode, an anode and the anode foil, wherein a transmitting terminal of the cathode and a receiving terminal of the anode are sealed in an outer anode cylinder; the anode foil is equipotential to the anode; and the anode foil is located between the transmitting terminal of the cathode and the receiving terminal of the anode. The anode foil is arranged in front of an anode target, so that the anode foil plasmas can be generated under the action of electron beams; the electron beams enter the area and then are subjected to strong pinch in the process of interacting with the anode foil plasmas; and small-spot and large-dose radiation X-ray output is obtained.
Description
Technical field
The present invention relates to the output of a kind of little focal spot high dose radiation from magnetic focusing x-ray diode, be specifically related to a kind of anode foils and produce the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt.
Background technology
Little focal spot pulsed X-ray can be used for having an X-rayed under extreme condition in the hydrodynamic calculations of high-speed moving object structure, state and evolutionary process, and in national defence, civil area has a lot of important application. Little focal spot x-ray source is the key parameter in this diagnostic system, and the parameter such as focal spot size, radiation dose is closely related with image quality.
Diode component owing to being used for producing little focal spot x-ray source is usually operated under millions of volt high voltage pulse, electromagnetic field circumstance complication, duty change is exceedingly fast (the work process persistent period is tens of ns only), and its design and Project Realization are one of the difficult points and key issue of spark photograph system development. The one of currently acquired application is anode rod pinch diode provided than more typical little focal spot x-ray source, and its focal spot size can reach sub-mm magnitude, and typical case's radiation dose is tens of mGy. X-ray focal spot produced by this diode is smaller, but owing to anode rod adopts the tungsten pin of diameter��1mm, electronics bremstrahlen is inefficient, and radiation dose is difficult to acquisition and is substantially improved.
Summary of the invention
It is an object of the invention to provide a kind of anode foils and produce the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, solve the technical problem that existing little focal spot x-ray source radiation dose is low.
The technical solution of the present invention is: the anode foils provided produces the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, including negative electrode and anode, the transmitting terminal of described negative electrode and the receiving terminal of anode are vacuum-sealed in anode urceolus, it is characterized in that described little focal spot x-ray diode also includes anode foils equipotential with anode, and described anode foils is between the transmitting terminal and the receiving terminal of anode of negative electrode.
Above-mentioned anode foils is conductive film.
Above-mentioned anode foils is the Mylar film of surface metallization aluminum conductive layer.
Above-mentioned flat board anode is the high atomic number metal target of 0.05��2mm thickness.
Above-mentioned hollow cathode is high purity graphite or brass material.
Above-mentioned anode foils is installed on front side of the receiving terminal of flat board anode by retainer ring and press mold ring.
Above-mentioned anode foils is additionally provided with anode foils tightening hoop.
The beneficial effects of the present invention is:
The present invention by arranging anode foils before plate target, it is possible to produces anode foils plasma under the effect of electron beam, and electron beam with anode foils plasma interaction process, strong constriction occurs after entering this region, it is thus achieved that the X ray output of little focal spot high dose radiation.
Accompanying drawing explanation
Fig. 1 is operation principle schematic diagram of the present invention;
Fig. 2 is the cross-sectional view of present pre-ferred embodiments.
Detailed description of the invention
Principles of the invention is to utilize anode foils to produce plasma to add strong-focusing, in typical case's " hollow cathode-flat board anode " electron beam diode structure, arranges a conductive film equipotential with it before flat board anode, and this thin film is referred to as anode foils. In diode operation process, anode foils, by after beam bombardment, quickly forms plasma slab at anode conversion target near zone. The bidirectional flow that plasma causes is conducive to Electron Beam Focusing constriction, and the spatial diffusion of plasma improves the magnetic distribution in anode conversion target region in addition, and above-mentioned factor all can Effective Regulation electron beam constriction focus state. When suitable parameters, above-mentioned combined factors effect can be obviously reduced x-ray focal spot size, improves radiation dose.
Referring to Fig. 1, electron beam 2 is launched from negative electrode 1, and while moving along electric field alignment anode 4, weak constriction occurs in the impact being subject to self-magnetic field. Electron beam 2 acts in anode foils 3 generation anode foils plasma, electron beam 2 enter this region after with the process of anode foils Plasma Interaction in there is strong constriction. Hereafter, electron beam 2 bombards anode 4 and produces bremstrahlen, it is thus achieved that little focal spot heavy dose X ray exports.
Referring to Fig. 2, hollow cathode 16 is processed by pyrite or high-density graphite material, and for loop configuration, external diameter is 8��12mm about, end surface rounding, it is desirable to without obvious fault in material and structural mutation. Anode urceolus 7 surrounds airtight vacuum cavity jointly with diode anode mounting seat 9, envelope vacuum cover plate 10, is connected with pulse power supply. Observation window 8 is positioned on anode urceolus 7, for optical windshield, for observing installment state and the optical diagnostics of diode operation process. Diode anode mounting seat 9 is anode return-flow structure, simultaneously as the fixed structure of anode foils retainer ring 11 and press mold ring 12. By regulating the inner ring thickness of anode foils tightening hoop 13, it is possible to adjust the gap between anode foils and high Z target 15 easily. High Z target 15 is high Z metal conversion included a tantalum target.
In installation process, anode urceolus 7, observation window 8 and hollow cathode 16 are connected with device in advance, keep horizontal centring with front end delivery line when hollow cathode 16 is connected, and the connection of anode urceolus 7 and observation window 8 guarantees vacuum tightness. Other structures adopt and install under line: keep flat retainer ring 11, by thickness be some tens of pm, surface metallization layer Mylar film be laid in retainer ring 11. From vertical direction, press mold ring 12 is installed, it is ensured that concavo-convex rim of the mouth no-float. Ensure on the basis that press mold 12 is smooth, by the fixing retainer ring 11 of screw and press mold ring 12. From vertical direction, anode foils tightening hoop 13 is installed, fixing screw is installed, it is ensured that Mylar membrane plane tensioning. Put into high Z metal conversion included a tantalum target, compress included a tantalum target by high Z target voltage ring 14. Above-mentioned press mold and conversion target structure are installed on anode return-flow structure, with vacuum cavity Flange joint. Press mold ring 12, retainer ring 11, tightening hoop 13, high Z target 15, high Z target voltage ring 14 all keep concentric. Envelope vacuum cover plate 10 is finally installed.
Claims (7)
1. an anode foils produces the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, including negative electrode and anode, the transmitting terminal of described negative electrode and the receiving terminal of anode are vacuum-sealed in anode urceolus, it is characterized in that: described little focal spot x-ray diode also includes anode foils equipotential with anode, and described anode foils is between the transmitting terminal and the receiving terminal of anode of negative electrode.
2. anode foils according to claim 1 produces the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, it is characterised in that: described anode foils is conductive film.
3. anode foils according to claim 2 produces the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, it is characterised in that: described anode foils is the Mylar film of surface metallization conductive layer.
4. produce, according to described anode foils arbitrary in claim 1-3, the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, it is characterised in that: described anode is the high atomic number metal target of 0.05��2mm thickness.
5. anode foils according to claim 4 produces the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, it is characterised in that: the material of described negative electrode is high purity graphite or brass material.
6. anode foils according to claim 5 produces the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, it is characterised in that: described anode foils is installed on front side of the receiving terminal of anode by retainer ring and press mold ring.
7. anode foils according to claim 6 produces the little focal spot x-ray diode that plasma Reinforced Hoop polycondensation is burnt, it is characterised in that: described anode foils is additionally provided with anode foils tightening hoop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610038206.2A CN105632856B (en) | 2016-01-20 | 2016-01-20 | Anode foils generate the small focal spot x-ray diode of plasma Reinforced Hoop polycondensation coke |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610038206.2A CN105632856B (en) | 2016-01-20 | 2016-01-20 | Anode foils generate the small focal spot x-ray diode of plasma Reinforced Hoop polycondensation coke |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105632856A true CN105632856A (en) | 2016-06-01 |
| CN105632856B CN105632856B (en) | 2018-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610038206.2A Expired - Fee Related CN105632856B (en) | 2016-01-20 | 2016-01-20 | Anode foils generate the small focal spot x-ray diode of plasma Reinforced Hoop polycondensation coke |
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| CN (1) | CN105632856B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110942967A (en) * | 2019-12-13 | 2020-03-31 | 中国工程物理研究院流体物理研究所 | X-ray tube |
Citations (6)
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|---|---|---|---|---|
| US5602397A (en) * | 1995-11-01 | 1997-02-11 | University Of Louisville Research Foundation, Inc. | Optical imaging system utilizing a charge amplification device |
| US5614722A (en) * | 1995-11-01 | 1997-03-25 | University Of Louisville Research Foundation, Inc. | Radiation detector based on charge amplification in a gaseous medium |
| US6455858B1 (en) * | 2000-08-13 | 2002-09-24 | Photon Imaging, Inc. | Semiconductor radiation detector |
| US6870498B1 (en) * | 1987-05-28 | 2005-03-22 | Mbda Uk Limited | Generation of electromagnetic radiation |
| CN1981361A (en) * | 2004-05-27 | 2007-06-13 | 科美特有限公司 | Apparatus for generating and emitting xuv radiation |
| WO2008156361A2 (en) * | 2007-06-19 | 2008-12-24 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Miniature x-ray source with guiding means for electrons and / or ions |
-
2016
- 2016-01-20 CN CN201610038206.2A patent/CN105632856B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6870498B1 (en) * | 1987-05-28 | 2005-03-22 | Mbda Uk Limited | Generation of electromagnetic radiation |
| US5602397A (en) * | 1995-11-01 | 1997-02-11 | University Of Louisville Research Foundation, Inc. | Optical imaging system utilizing a charge amplification device |
| US5614722A (en) * | 1995-11-01 | 1997-03-25 | University Of Louisville Research Foundation, Inc. | Radiation detector based on charge amplification in a gaseous medium |
| US6455858B1 (en) * | 2000-08-13 | 2002-09-24 | Photon Imaging, Inc. | Semiconductor radiation detector |
| CN1981361A (en) * | 2004-05-27 | 2007-06-13 | 科美特有限公司 | Apparatus for generating and emitting xuv radiation |
| WO2008156361A2 (en) * | 2007-06-19 | 2008-12-24 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Miniature x-ray source with guiding means for electrons and / or ions |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110942967A (en) * | 2019-12-13 | 2020-03-31 | 中国工程物理研究院流体物理研究所 | X-ray tube |
| CN110942967B (en) * | 2019-12-13 | 2022-07-15 | 中国工程物理研究院流体物理研究所 | X-ray tube |
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| CN105632856B (en) | 2018-06-19 |
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