The invention relates to the technical field of artificial diamonds, in particular to
a diamond MPCVD
resonant cavity which comprises an upper shell, a lower shell and a
quartz cavity. An edge pressing part is arranged below the cylindrical part of the
quartz cavity, and the upper shell is matched with the lower shell to clamp and seal the edge pressing part; a clamping part is arranged at a connecting port, matched with the water-cooled antenna, above the cylindrical part, the water-cooled antenna comprises a pressing plate and a conical antenna disc, the conical antenna disc is matched with the pressing plate to clamp and seal the clamping part, and the edge pressing part and a clamping part sealing ring are both cooled in an
air cooling and
water cooling synergistic mode. According to the invention, an external force clamping connection fixing mode is adopted, so that the sealing performance of connection is ensured, the problem that the
electric field intensity at the edge of
quartz is increased due to the poor sealing effect of a traditional sealing mode is avoided, and only one strong
electric field capable of exciting plasmas exists in the quartz cavity; and the sealing ring is effectively prevented from being overheated in a water-cooling and air-cooling synergistic cooling mode, and the positive effects of ensuring stable operation of equipment and improving the production efficiency are achieved.