Abstract
The addition of another loop in a typical DC electron emission controller between (a) the filament supply point and (b) the inverting input of the operational amplifier improves the work of the whole system. If this loop consists of a diode directed from point a to point b and a capacitor connected in parallel to the diode the system has the following new features: (1) it enables a gradual heating of the filament for its outgassing when the system is turned on, (2) the filament is protected in the case when the main feedback loop having external parts is accidentally broken, (3) the capacitor eliminates the generation of any AC current in the filament circuit. The last property notably extends the lifetime of the filaments working in a strong magnetic field, e.g. in mass spectrometers.
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