Crystal pulling apparatus

摘要

Crystal growing appts. consists of a crucible (4) surrounded by a heater (5) and arranged in a container (1), whose wall is provided with a thermal insulation (10) and on its outer side with cooling channels (3) for a cooling medium. The container has a protection gas inlet (11,12) and outlet (14,15). The novelty is that the container (1) has, in the region of the crucible (4), an annular chamber (8) connected by an inner protective tube (6) to the heater (5), the chamber limited by an outer protective tube (7), behind which the thermal insulation (10) of the container (1) is located.