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 Magnetron is a diode vacuum tube built using cavity resonators. It consists of a cathode   that is utilised to release electrons, anode cavities and a permanent magnet which is included on the flipside of cathode.   The space between the cathode and anode cavity is known as interacting space. In magnetron,   the electrons emitted from cathode moves in random directions(depending on the electric & magnetic field) while interacting with the spaces.

 in magnetron, depending on the strength of the electric field, the electrons from the cavity will move in a random direction.    I.e., in the absence of magnetic field,the electrons will travel directly from the cathode to the anode.    This is due to the radial electric field force that acts on the electrons. However, if the magnetic field strength increases vaguely,    it will apply that bends the path of the electron. If the strength of the electrons is increased, then the electrons reaching the anode is averted.

 the movement of electrons not only depends on the electric field but also depends on the magnetic field.    The magnetic field must be applied perpendicular to electric field. If the strength of the magnetic field is more than    that of the electrons, the emitted electrons will return to cathode with high velocity.

  To know how magnetron works, visit https://www.youtube.com/watch?v=GXy6AAp0vf8.