Where does the proton come from in a Cyclotron?

[Symmetry777]

Where does the proton come from in a Cyclotron?

 

[Bystander]

Ionization of hydrogen.

 

[Symmetry777]

Is the ionization of the hydrogen atom caused by the "magnetic coil", the top and bottom plates?

Or is the ionization of the hydrogen atom caused by the two half "Dees" oscillator?

Or is it both of the above?

http://en.wikipedia.org/wiki/Cyclotron#mediaviewer/File:Cyclotron_diagram.png

Thank You

 

[Bystander]

Or, neither. It's injected into the ring by acceleration through an electric field after being generated in a proton "source" which can be anyone of a variety of ionization chambers.