CN102711358A - Vacuum chamber high-tension insulation electron gun - Google Patents
Vacuum chamber high-tension insulation electron gun Download PDFInfo
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- CN102711358A CN102711358A CN2012101832504A CN201210183250A CN102711358A CN 102711358 A CN102711358 A CN 102711358A CN 2012101832504 A CN2012101832504 A CN 2012101832504A CN 201210183250 A CN201210183250 A CN 201210183250A CN 102711358 A CN102711358 A CN 102711358A
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- vacuum
- electron gun
- voltage insulation
- vacuum chamber
- tension insulation
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Abstract
The invention provides a vacuum chamber high-tension insulation electron gun. The vacuum chamber high-tension insulation electron gun comprises a cathode, a focusing electrode, a high-tension insulation ceramic cylinder, a vacuum hosing and a vacuum housing cover, wherein the high-tension insulation ceramic cylinder is mounted in the vacuum housing; the cathode and the focusing electrode are mounted in the high-tension insulation ceramic cylinder; and the vacuum hosing and the vacuum housing cover are connected with each other and form a sealed chamber. The sealed chamber is vacuum, and the pressure thereof is less than or equal to 10<5> Pa. A grid mesh can be further arranged between the focusing electrode and the cathode, and the position of the grid mesh is adjacent to the cathode. The high-tension insulation ceramic cylinder is cylindrical. When the electron gun is at the state of vacuum and the pressure is below 10<5> Pa, the pressure resistance of the electron gun is increased exponentially. According to the invention, as the high-tension insulation ceramic cylinder is mounted in the vacuum chamber formed by the vacuum hosing and the vacuum housing cover, the pressure resistance is improved, the length of the high-tension insulation ceramic cylinder is effectively shorted, the length of an accelerating tube is shorted, and the installation space of the accelerating tube on an accelerator is reduced, so that the height is reduced in the structure and the achievement of high current electron is possible through the method of increasing accelerating cavities.
Description
Technical field:
The present invention relates to physical field, relate in particular to radiotherapy equipment, particularly medical electron linear accelerator, concrete is a kind of vacuum chamber High-Voltage Insulation electron gun.
Background technology:
Accelerator for electron therapy is used for radiotherapy.The ionising radiation of accelerator for electron therapy is produced by the electron beam conversion that accelerating tube provided, and the electron beam in the accelerating tube is annotated by the electronics of electron gun and produced.In the prior art, the electron gun High-Voltage Insulation is all worked under atmospheric condition, because air dielectric directly has influence on the raising of electron gun voltage, in order to improve the voltage of electron gun, the corresponding insulation design just has influence on the structure height of electron gun.In addition; The Source Axis Distance size of accelerator for electron therapy equipment is 100 centimetres of definite values, in order to develop the accelerating tube that can produce the high current electronics, and the drawing high pressure and need be increased to 40KV of electron gun; In order to improve the accelerator output dose; Need to adopt the method that improves energy output, thereby need to increase accelerating cavity, this just more requires the height of rifle to need compression.In order to guarantee the insulation of rifle high pressure, former diode gun often adopts the rifle bonnet to increase the insulating barrier of silicon rubber, have influence on like this complete machine etc. centre-height.In addition, if electron gun to draw high pressure on the low side, the job stability of diode gun can receive the influence of microwave power source, occurrence frequency skew, precision and time that the influence treatment is followed the tracks of.
Summary of the invention:
The object of the present invention is to provide a kind of vacuum chamber High-Voltage Insulation electron gun, described this vacuum chamber High-Voltage Insulation electron gun will solve the technical problem that structure height is higher, job stability is not enough of accelerator for electron therapy electron gun in the prior art.
This vacuum chamber High-Voltage Insulation electron gun of the present invention; Comprise negative electrode, focusing electrode, High-Voltage Insulation pottery tube, vacuum casting and vacuum casting lid; Wherein, Described High-Voltage Insulation pottery tube is arranged in the described vacuum casting, and described negative electrode and focusing electrode are arranged in the High-Voltage Insulation pottery tube, and described vacuum casting covers and is connected with vacuum casting and forms annular seal space.
Further, be vacuum in the described annular seal space.
Further, be provided with aperture plate between described focusing electrode and the negative electrode, described aperture plate position and negative electrode are adjacent.
Further, described vacuum casting and vacuum casting lid welding.
Further, described High-Voltage Insulation pottery tube is cylinder barrel shaped.
Further, the pressure in the described vacuum casting is less than or equal to 10
-5Pa.
Further, described electron gun is diode gun or triode gun.
Operation principle of the present invention is: the air dielectric puncture voltage also can be approx with the disruptive field intensity of 30kv/cm.At vacuum state, Xing Dinglv calculates according to crust:
In the formula: A, B are the experimental constants that depends on gaseous species, and γ is relevant with many factors such as gaseous species, composition, electrode materials, and P is an operating pressure, and d is an anode-cathode distance.
Through calculating, electron gun is 10
-5The withstand voltage degree of vacuum state below the Pa increases exponentially.High-Voltage Insulation pottery tube is installed in the vacuum chamber of vacuum casting and vacuum casting lid formation; Improve withstand voltage degree, effectively shortened the length of High-Voltage Insulation pottery tube, shortened accelerating pipe length; Reduce the installing space of accelerating tube on accelerator, just can reduce height on the structure.
The present invention and prior art are compared, and its effect is actively with tangible.The present invention is installed in the pottery of the High-Voltage Insulation in electron gun tube in the vacuum chamber; Improved withstand voltage degree; Can effectively shorten the length of pottery tube; And then shortened accelerating pipe length, and reduced the installing space of accelerating tube on accelerator, make through increasing accelerating cavity and improve the high current electronics and become possibility.
Description of drawings:
Fig. 1 is the structural representation of an embodiment of a kind of vacuum chamber High-Voltage Insulation of the present invention electron gun.
Fig. 2 is the structural representation of another embodiment of a kind of vacuum chamber High-Voltage Insulation of the present invention electron gun.
Embodiment:
Embodiment 1:
As shown in Figure 1; A kind of vacuum chamber High-Voltage Insulation of the present invention electron gun adopts diode gun version; Comprise negative electrode 3, focusing electrode 2, High-Voltage Insulation pottery tube 1, vacuum casting 5 and vacuum casting lid 6, High-Voltage Insulation pottery tube 1 is arranged in the vacuum casting 5, and negative electrode 3 is arranged in the High-Voltage Insulation pottery tube 1 with focusing electrode 2; 5 of vacuum casting lid 6 and vacuum castings form annular seal space, are vacuum state in the annular seal space.
Further, vacuum casting 5 forms seal cavity with vacuum casting 6 lid welding backs.
Further, High-Voltage Insulation pottery tube 1 is cylinder barrel shaped.
Further, the pressure in the vacuum casting is 10
-5Below the Pa.
Embodiment 2:
As shown in Figure 2, a kind of vacuum chamber High-Voltage Insulation electron gun of the present invention adopts triode gun version, and the difference of itself and embodiment 1 is that between focusing electrode 2 and negative electrode 3, also be provided with aperture plate 4, aperture plate 4 is positioned under the negative electrode 3.
Claims (8)
1. vacuum chamber High-Voltage Insulation electron gun; Comprise negative electrode, focusing electrode, High-Voltage Insulation pottery tube, vacuum casting and vacuum casting lid; It is characterized in that: described High-Voltage Insulation pottery tube is arranged in the described vacuum casting; Described negative electrode and focusing electrode are arranged in the High-Voltage Insulation pottery tube, and described vacuum casting lid is connected with vacuum casting and forms annular seal space.
2. vacuum chamber High-Voltage Insulation electron gun as claimed in claim 1 is characterized in that: be vacuum in the described annular seal space.
3. vacuum chamber High-Voltage Insulation electron gun as claimed in claim 1 is characterized in that: be provided with aperture plate between described focusing electrode and the negative electrode, described aperture plate position and negative electrode are adjacent.
4. vacuum chamber High-Voltage Insulation electron gun as claimed in claim 1 is characterized in that: described vacuum casting and the welding of vacuum casting lid.
5. vacuum chamber High-Voltage Insulation electron gun as claimed in claim 1 is characterized in that: described High-Voltage Insulation pottery tube is cylinder barrel shaped.
6. vacuum chamber High-Voltage Insulation electron gun as claimed in claim 1 is characterized in that: the pressure in the described vacuum casting is less than or equal to 10
-5Pa.
7. vacuum chamber High-Voltage Insulation electron gun as claimed in claim 1, it is characterized in that: described electron gun is a diode gun.
8. vacuum chamber High-Voltage Insulation electron gun as claimed in claim 1, it is characterized in that: described electron gun is a triode gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101832504A CN102711358A (en) | 2012-06-05 | 2012-06-05 | Vacuum chamber high-tension insulation electron gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101832504A CN102711358A (en) | 2012-06-05 | 2012-06-05 | Vacuum chamber high-tension insulation electron gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102711358A true CN102711358A (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101832504A Pending CN102711358A (en) | 2012-06-05 | 2012-06-05 | Vacuum chamber high-tension insulation electron gun |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3585445A (en) * | 1969-03-03 | 1971-06-15 | Varian Associates | Method for preserving electron gun assemblies |
| US4801839A (en) * | 1986-12-08 | 1989-01-31 | Applied Electron Corporation | Mounting of a cold cathode directly to a vacuum chamber wall |
| JPH02160400A (en) * | 1988-08-04 | 1990-06-20 | Mitsubishi Electric Corp | High frequency electron gun |
| CN1145474A (en) * | 1996-05-17 | 1997-03-19 | 清华大学 | High vacuum micro-ionization gauze with superlow absorbing-discharging gas rate |
| EP1024517A1 (en) * | 1999-01-26 | 2000-08-02 | Marconi Applied Technologies Limited | Electron beam tubes |
| CN101587812A (en) * | 2008-05-20 | 2009-11-25 | 三星电子株式会社 | Electron beam focusing electrode and electron gun using the same |
| CN101778527A (en) * | 2010-02-03 | 2010-07-14 | 中国科学技术大学 | Independent tuning microwave electron gun with external cathode |
| CN202652679U (en) * | 2012-06-05 | 2013-01-02 | 广东中能加速器科技有限公司 | Vacuum chamber high-voltage insulating electron gun |
-
2012
- 2012-06-05 CN CN2012101832504A patent/CN102711358A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3585445A (en) * | 1969-03-03 | 1971-06-15 | Varian Associates | Method for preserving electron gun assemblies |
| US4801839A (en) * | 1986-12-08 | 1989-01-31 | Applied Electron Corporation | Mounting of a cold cathode directly to a vacuum chamber wall |
| JPH02160400A (en) * | 1988-08-04 | 1990-06-20 | Mitsubishi Electric Corp | High frequency electron gun |
| CN1145474A (en) * | 1996-05-17 | 1997-03-19 | 清华大学 | High vacuum micro-ionization gauze with superlow absorbing-discharging gas rate |
| EP1024517A1 (en) * | 1999-01-26 | 2000-08-02 | Marconi Applied Technologies Limited | Electron beam tubes |
| CN101587812A (en) * | 2008-05-20 | 2009-11-25 | 三星电子株式会社 | Electron beam focusing electrode and electron gun using the same |
| CN101778527A (en) * | 2010-02-03 | 2010-07-14 | 中国科学技术大学 | Independent tuning microwave electron gun with external cathode |
| CN202652679U (en) * | 2012-06-05 | 2013-01-02 | 广东中能加速器科技有限公司 | Vacuum chamber high-voltage insulating electron gun |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121003 |