You've all wondered I'm sure where those Microwaves in your oven come from. This is a Continuous Wave Magnetron of the type that does supply those nasty nucular energies!
The electrons leave a heater (Location I've marked with a dot in the center as the Heater is part of the cap which I removed to expose the interior). The electrons are forced to cloud around the dot then stream across to the radial vanes which sit at neutral electrical potential. As the electrons cross the gap and through a magnetic field from some external magnets, they pick up a spin at 2,000,000,000 rotations per second rate and give it up when they get to the vanes. If you look between the two lower vanes you can make out the power pick up loop that transmits the power out of the tube and into the oven. The body and vanes are almost pure Copper and the two concentric rings are Silver solder rings which keep the vanes strapped at alternating relative potentials of +/- and also help hold them in place though processses later in the manufacturing cycle which could tend to mis-align the vanes. Different travel lengths/times, amperage and gauss magnetic field strengths will change the power and frequency of each tube (oh yeah, Solid State and IC's haven't completely killed off the vacuum tube. This was one before I opend it.) It really is so pure a copper what you see as the inside bottom is really overhead clouds reflected into the camera when I took the shot outdoors for the best lighting.
Tomorrow I want you all to know what a Crossed Fields Amplifier (CFA) is. The messy mangled structure in the bottom is the cap piece I used to help hold the tube body up to the camera.
Can anyone guess why this type of microwave device was once referred to as a rising sun magnetron?