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Q:
How the electons are focused and accelerated forwards in the cathode ray oscilloscope?
- Albert Lau (age 17)
Malaysia
A:
Good question. The electrons start out from an electrode called a cathode. They are boiled out of a metal by heating it up to a high temperature. The electrons are then attracted to another electrode, called the anode, by means of an electric field caused by applying a positive voltage between the cathode and the anode. The electrons can be deflected by applying a transverse electric or magnetic force field. Focusing can be obtained by means of a clever arrangement of field gradients. The technical term is a quadrupole field.
You can find some more information at
http://www.answers.com/topic/crt?cat=technologyA nice historical article can be found at
http://members.chello.nl/h.dijkstra19/page3.htmlLeeH
(published on 06/19/2008)
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