The military already has a “death ray.” It turns out that the sensor systems for the F-35 (and F-22, I think) are potent enough to fry missile electronics and they are quietly experimenting with them used in that mode...
So what do you bet they can do “Wonderful Things” with an AWACS?
There was a space game back in the late 80’s called “Elite”.
One of the accessories that you could get for your ship was an ECM for missiles. Basically an energy blast that fried the missile. Took a lot of energy. The info in your post shows that such a thing is indeed possible.