what creates the magnetic field on a cyclotron? in all of the schematics I am looking at it just says "magnetic field points up" like it is extremely apparent as to what creates the magnetic field. I was thinking that a bunch of small diameter solenoids packed side by side would be the best way to create a magnetic field like this. is this how it is done? do the wires get hot? do they need cooling? also the magnetic field would be resisted if the chamber for the particles was completely enclosed by metal and the solenoids were external? what keeps the particles from falling toward the earth? it is just hard to see what is going on. Even the physics textbooks on particle accelerators just have crappy little black and white drawings. I just want to see where everything is. there must be a 3D model of these accelerators out there somewhere!