Re: Electron gun

On Tue, 30 Dec 2008 20:23:37 +0000, Dead Paul <dead_paul@xxxxxxxx>
wrote:

On Tue, 30 Dec 2008 09:42:40 -0600, Phi wrote:

On Mon, 29 Dec 2008 23:06:28 -0800, anju wrote:

An electron gun is a part of cathode ray tube on increasing the filament
current the rate of emission of electrons from the cathode will
increase. on the other hand, by increasing the accelerating potential on
anode, the energy of electrons reaching the anode will increase due
which the electrons will strike the screen with a greater speed.


http://electronicstopics.blogspot.com/2008/10/electron-gun.html


You forgot to mention that this only occurs in a vacuum.

Well, no. Low pressure will do but you may then get ionization of the
gases in the tube which will contribute to the ion flow - see Crookes tube.

If it is a hot cathode tube containing gas which ionises then it would
then be a Thyratron and not a Crookes Tube or Cathode Ray Tube.

Svenne


.

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