A Different Way to Achieve Electron Velocity Modulation in a Klystron

[Narayanan KR]

TL;DR

Both Reflex Klystrons and Two cavity Klystrons use electric field between parallel plates to accelerate or decelerate (i.e. velocity modulate) the electrons emitted from Cathode. Question is, will there be a same effect of velocity modulation, if I place a toroidal core (ferrite or air core) with coil wound around it and feed by a RF source ? because the time varying magnetic fields in the toroidal coil produces time varying Electric Fields parallel to the electron motion inside the Tube.

Please Notice That the Toroid Coil is Outside the Discharge Tube and yet able to influence electrons moving inside the Tube.

 

[tech99]

I think it is OK. I think the field distribution of a toroid is the same as the cavity resonator you show (rhumbatron as it was called).

 

[Narayanan KR]

I think it is OK. I think the field distribution of a toroid is the same as the cavity resonator you show (rhumbatron as it was called).

Thank You, now I shall Proceed with my Experiment.

 

[sophiecentaur]

I think the field distribution of a toroid is the same as the cavity resonator you show (rhumbatron as it was called).

I have a feeling that the E field in the proposed system would be a lot lower than across the gap in a normal toroidal cavity. The Impedance of the toroidal core where the electrons pass through would be low because there are wires (the turns of the coil) parallel to the direction of the electron beam. E field along the surface of a wire is about zero.