Microwave heating system

A microwave heating system, comprising

• a bowl,
• a dome adapted to be fit to the bowl, such that a volume is formed by the bowl and dome, and
• a rotor device adapted to support at least one reaction vessel and being rotatably supported by the bowl, the rotor device comprising
• a base plate comprising at least one through-hole, and
• at least one tubular member having a longitudinal axis and being adapted to receive the at least one reaction vessel and to be coupled to the base plate in such a way that the longitudinal axis of the at least one tubular member passes through the at least one through-hole such that a portion of the at least one reaction vessel when present extends beyond the base plate,
• wherein the base plate and the at least one tubular member comprise metal, and
• wherein the bowl is adapted to be connected to a microwave generating unit, the microwave generating unit supplying a microwave field to the volume, the base plate and the at least one tubular member configured to attenuate the microwave field in a region between the rotor device and the dome and above a sample when present in the at least one reaction vessel within the at least one tubular member compared to a region between the bowl and the base plate of the rotor device, the microwave field propagating from the region between the bowl and the rotor device into the at least one tubular member and the at least one reaction vessel to heat the sample by microwave absorption.