I may have it. Here goes.
If electrons are sent down a copper wire at a given flow rate based on resistance
of the wire and the amount of current being forced into the wire, and if we assume
that the electron flow in the wire is creating a magnetic field from the straight flow
of said electrons it would cause them to fling themselves towards the outer wall
of the wire thereby causing the flow to cease and create a condition called impedance.
If we wrap a copper wire around a copper wire and energize it then we can control
the electrons from spinning out and focus them back into the wire to keep flowing
down till they reach the end or loop in this case. This Traveling wave tube
is the device that Steven made but instead of a vacuum with a high resistance
and a heated cathode he used a wire with little resistance. Send the electrons
down the wire first then start pulsing the coils one by one shooting the electrons around
the collector wire like a coil gun shoots a projectile. That may be the reason the
device behaves like it has inertia when operating.