Drive a magnetron with low power via a CCFL backlight driver
Is it feasible/reasonable to drive a microwave oven magnetron from a CCFL backlight driver?


No, magnetrons require a high DC voltage and a CCFL driver will output AC.

Also, a magnetron can't be operated on a lower voltage to get lower power output. A magnetron tube is designed for a certain power output and it will only work at or close to that power output.

I urge you to get a much, much better understanding of how Magnetrons and (high power) RF works before even considering experimenting with this. Any sane Electrical engineer will strongly advise you not to experiment with a magnetron before you have proven your knowledge on the subject.