Vacuum Tube Diode Explained: Electron Boiling

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The vacuum diode operates by boiling electrons off the cathode, which initially leave at low thermal velocities. An electric field between the anode and cathode accelerates these electrons toward the anode. Space charges form due to the accumulation of electrons near the cathode, which prevents immediate flow to the anode. Before a steady current is established, the space charge initially inhibits electron movement until the electric field overcomes this barrier. Understanding these dynamics is crucial for grasping the behavior of vacuum diodes.
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Can anyone explain me the mechanism of vacuum diode.Specifically how the electronts which are 'boiled' of the cathode behave
 
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They leave the cathode at low, thermal velocities.
They are accelerated to the anode by the electric field between the anode and the cathode.
 
why are there any space charges at all why don'e they flow towards the anode
 
pardesi said:
why are there any space charges at all why don'e they flow towards the anode
The space charge does flow toward the anode, but more electrons keep coming from the cathode, so there is a steady current and a constant space charge.
 
well actually i was talking about the situation before the steady current begins then what does happen
 
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