Radiation physics and special relativity

[RadPhysNoob]

Hi all, first time here; hoping for any help I can get to point me in the right direction! I'm currently setting up a spreadsheet to determine a few different points based upon a theory of an x-ray tube from cathode (-120kV) to anode (0 kV). My problem is, I seem to be going in a frustrating, circular pattern trying to find the base equation that will then help solve all the other equations.

m₀:mass of electron at distance 0: 9.109 x 10^-31 kg
e:electron charge: -1.602 X 10^-19 C
c: speed of light: 2.990 x 10⁸ m/s
To solve for:
Volts, Kinetic Energy, Potential Energy, relativistic constant, mass of electron (all at points increasing by 0.1 from 0-2 cm)I'm also given the equation for the relativistic constant: 1/sqrt(1-(v²/c²) and another quantity z, which = KE/m₀*c²I'm wondering if the potential difference (V) is 120kV, which would make the electrical field charge = V/delta(x) = 120kV/2cm = 6 x 10⁶C. If I find this, can I then solve for potential energy as V/electron charge?

I know this is all a bit TL;DR...I'm just frustrated and hoping for someone to help me find a good first step.

 

[vela]

Your first step should be to go back and review basic electromagnetism. There's no such thing as "electric field charge," for instance. If you clear up your misunderstandings about the electric potential, electric field, and potential energy and how they're related, it'll go a long way toward helping you approach the problem correctly.