Material for suppressing secondary electron emission
A technology of secondary electron emission and carbon fiber, applied in the direction of solid thermionic cathode of discharge tube, main electrode of discharge tube, etc., can solve the problem of high secondary electron emission coefficient, increase wall potential, reduce heat flux, suppress secondary electron emission The effect of electron emission
Active Publication Date: 2014-12-24
SUZHOU UNIV
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Problems solved by technology
However, the above method of suppressing secondary electron emission still obtains a relatively high final secondary electron emission coefficient
Method used
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Embodiment 1
[0024]Example 1: A material composed of graphite walls and carbon fibers vertically and evenly distributed on the surface of the graphite walls, wherein the length of the carbon fibers is 1.5 mm and the distribution density is 0.8%.
Embodiment 2
[0025] Embodiment 2: A material composed of graphite walls and carbon fibers vertically and evenly distributed on the surface of the graphite walls, wherein the length of the carbon fibers is 1.5 mm, and the distribution density is 0.5%.
Embodiment 3
[0026] Embodiment 3: A material composed of graphite walls and carbon fibers vertically and evenly distributed on the surface of the graphite walls, wherein the length of the carbon fibers is 1.5 mm and the distribution density is 1.8%.
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Abstract
The invention relates to material for suppressing secondary electron emission. The material comprises a graphite wall and carbon fibers. The carbon fibers are vertically and evenly distributed on the surface of the graphite wall. Electrons are applied to bombard the graphite wall to generate secondary electrons, the secondary electrons are emitted at different angles from the surface of the graphite wall, very few of the secondary electrons return to vacuum after multiple emission and absorption of the carbon fibers, emission coefficient of the secondary electrons is less than 1 and close to zero, secondary electron emission is suppressed, wall potential is significantly increased since the secondary electron emission is decreased, heat flux of the electrons from plasma to the graphite wall is decreased, wall heating, wall evaporation and plasma cooling are suppressed, and features of the graphite wall and properties of the plasma are unchanged.
Description
technical field [0001] The present invention relates to a material for suppressing secondary electron emission. Background technique [0002] When electrons with a certain energy or speed bombard the surface of the material, it will cause electrons to be emitted from the surface of the bombarded material. This phenomenon is called secondary electron emission. The electrons that bombard the material are usually called incident electrons, and the electrons emitted from the bombarded material are called secondary electrons. The secondary electrons also include the incident electrons that are ejected directly from the surface of the material. The number of secondary electrons is the same as that of the incident electrons. The ratio of the number is called the secondary electron emission coefficient, and δ is often used to represent this quantity. [0003] Secondary electron emission can have deleterious effects in some vacuum devices. For example, in a gate-controlled electron...
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IPC IPC(8): H01J1/14
Inventor 金成刚黄天源杨燕杨东谨胡一波诸葛兰剑吴雪梅
Owner SUZHOU UNIV