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File:Cyclotron motion smaller view.jpg

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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.
Author Sfu

This is a cropped image of File:Cyclotron motion wider view.jpg. It only displays the bulb.


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Beam of electrons in a vacuum tube bent into a circle by a magnetic field

20 November 2008

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current18:58, 16 August 2012Thumbnail for version as of 18:58, 16 August 20121,383 × 1,749 (167 KB)Cantons-de-l'Est
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