In a recent LPP progress report, they were mentioning the use of microwaves as a simple way to remove oxides, but said this might result in uneven oxide removal, since there is no way to include a microwave oven turntable.
Don’t a lot of newer microwave ovens have some sort of “Chaos” feature that randomizes the microwaves to even everything out?
Oxide removal with microwaves should be part of “bake out”. Unfortunately, the mode shapes can be changed via a mixer, but not infinitely. If possible, a side loop of glass tubing to the vacuum pump could be coated with a ‘getter’ metal via induction evaporation, following draw down. Any oxygen released during bake or firing may be absorbed.