An Automatic Tuning Method of Electron Gun Filament Heating Current Based on Constant Electron Beam Current
A technology of electron beam current and heating current, applied in circuits, discharge tubes, electrical components, etc., can solve the problem of inability to take into account the service life of electron beam filament cathode, and achieve the effect of prolonging life
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[0028] The principle of the present invention based on the electron gun filament heating current automatic setting method with constant electron beam current is as follows:
[0029] The acceleration voltage of the three-pole Pierce electron gun is stabilized at U a value, the electron beam current is stable at I E Value, after the filament current reaches a certain value, the grid bias voltage -U G vs. filament current I K It is an exponential function relationship with the natural number e as the base, such as figure 1 shown. Define the filament current I K with minimum filament current I Kmin The difference is the relative filament current I k =I K -I Kmin , defining the gate bias voltage -U G with the minimum gate bias voltage -U Gmin The difference is the relative gate bias voltage -U g =-U G -(-U Gmin )=ψ(I k ), then after the filament current exceeds a certain value, the relative grid bias voltage -U g with relative filament heating current I k The relati...
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