# Illustration Basic Setup of a Teltron Tube Experiment

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An electron cloud is generated at a heating spiral with the help of the heating voltage $$U_{\text H}$$. Electrons in this cloud are accelerated by accelerating voltage $$U_{\text B}$$ to the permeable anode (dashed).

The above setup is inside a Helmholtz coil, which has a homogeneous magnetic field inside. This means that the accelerated electrons are exposed to an external magnetic field.

Moving charges in the magnetic field are deflected into a circular path. To make this electron circular path visible, molecular hydrogen (H2) is used here, which is confined in a glass bulb together with the setup above. The flying electrons collide with the gas molecules and generate visible light by exciting the molecules.