Just how bad can an Ion burn be?

[benman94]

No ions are being deflected by an appreciable amount in an electromagnetic deflection tube, period, unless an electrostatic focusing element is screwing with them.

A proton is about 1836 times as massive as an electron. (An electron is about 0.511 MeV over the speed of light squared, a proton is about 938 MeV over the speed of light squared, a neutron is about 939 MeV over the speed of light squared.)

I'm not sure which ions you would expect to find in a CRT, but let's assume it's something relatively light, comparable to an alpha particle at a mass of 3.727 GeV per speed of light squared. Now we're talking about objects on the order of 7294 times as massive as the lowly electron. Electromagnetic deflection from a TV yoke isn't going to do jack to a proton or neutron, and certainly not something similar in rest mass to an alpha particle.