Isochronous cyclotron thumb|250px|In isochronous cyclotrons, the magnetic field strength as a function of the radius has the same shape as the Lorentz factor as a function of the speed .
Isochronous cyc.lotron thumb|250px|In isochronous cyclotrons, the magnetic field strength as a function of the radius has the same shape as the Lorentz factor as a function of the speed 