Cyclotron_motion_smaller_view.jpg
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Summary
| Description |
Français :
Un faisceau d'électrons défléchis par un
champ magnétique
forme un cercle par effet
cyclotron
. La lueur provient de l'excitation des atomes gazeux prisonniers de l'ampoule.
English:
Beam of
cathode rays
(
electrons
) in a demonstration vacuum tube moving in a circle in a magnetic field (cyclotron motion). The electrons are produced by an
electron gun
at bottom, consisting of a
hot cathode
, a metal plate heated by a
filament
so it emits electrons, and a cylindrical metal
anode
at a high voltage which accelerates the electrons into a beam. The red circular
Helmholtz coil
partially visible behind the tube generates a horizontal magnetic field that exerts a
Lorentz force
on the electrons. The force on the electrons is perpendicular to their direction of motion, causing them to bend into a circular path. Cathode rays are normally invisible, but enough air has been left in the tube so that the air molecules glow pink from
fluorescence
when struck by the fast-moving electrons.
|
| Date | |
| Source | File:Cyclotron_motion_wider_view.jpg |
| Author | Sfu |
This is a cropped image of File:Cyclotron motion wider view.jpg . It only displays the bulb.
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