First off I am an amateur scientist and my questions are for the most part academic and any experiments that I do are always done prudently. My questions are concerning particle accelerators. 1. If I accelerate protons within a field provided simply by two plates by which the protons when accelerated never touch the cathode; by what mechanism is the power transferred from the driving circuit to the protons? I keep thinking about it but it looks to me like it is a static field and no current can flow. The protons as they pass the cathode do not pick up electrons and so the field remains static and no power is consumed. This is of course not the case which is why I have the question. 2. If I had a ring that charged particles will circulate in and one portion of the ring has a pair of plates to provide an accelerating field with, will simply providing this field in time add power to the beam? Or am I missing something. what I am asking exactly is as the protons pass into the area of the field and the field is activated to 10000v will it increase the energy of the beam by 10000ev or is there a problem with the particles already having a "net" charge of 10000v and not be accelerated by the field? The answers you provide will greatly clarify things for me in my head and I do appreciate any attention to these questions that this community may provide. Thank you.