How to introduce microwaves into high-temperature, high-pressure steel containers?

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Our laboratory intends to design a small steel reactor (around 20–30 L) in which water vapor reacts with solid particles, and microwaves are introduced into the reactor to catalyze the reaction. The designed operating temperature shall not exceed 250°C, and the designed pressure shall not exceed 5 MPa. To introduce microwaves into the reactor, the material at the microwave inlet must have good microwave permeability, but it also needs to prevent the penetration of water vapor, as well as withstand high temperatures and pressures and endure certain impacts. Among the several commonly used materials that I am aware of, steel reflects microwaves; ceramics are unable to prevent water vapor from passing through; fiberglass and polytetrafluoroethylene do not meet the required operating temperatures. I am currently considering quartz glass as an alternative, but I am unsure whether it will satisfy the requirements. Do everyone think that quartz glass can meet the requirements? Or could everyone help recommend some good materials that can meet the requirements? Or help design a structure that ensures microwaves can be smoothly introduced into the reactor even if not all of the materials meet these conditions. This is my first time designing experimental equipment that requires stringent working conditions and involves microwave coupling; I have no experience at all and find it extremely difficult. I am hoping to get answers and guidance from everyone. . .