Patent ID: 8409400
Filing Date: 2013-04-02
Classification: H01J

Abstract:
1. An inductive plasma chamber with multiple discharge tube bridges, comprising: a hollow discharge tube head having an upper surface and a lower surface, a gas inlet defined by an opening in the upper surface through which a gas is injected and a plurality of openings in the lower surface; a process chamber having a gas outlet for exhausting the gas and a susceptor on which a workpiece is placed inside the process chamber, wherein a plurality of openings corresponding to the openings of the discharge tube head are formed in a upper surface of the chamber, the process chamber formed by a external wall, the external wall having an inner surface and an outer surface, the external wall forming an upwardly centrally inclined surface in an upper portion of the inner and outer surfaces thereof, the inner surface of the external wall in the inclined portion forming an inner diameter of the process chamber; a plurality of tubular members having an outer surface and an inner surface, each tubular member defining a hollow discharge tube bridge connecting an opening of the discharge tube head and an opening of the process chamber, a portion of the surfaces of each of the tubular members connecting to the upwardly centrally inclined surface of the process chamber; at least one ferrite core disposed around at least a portion of each of the tubular members of the discharge tube bridges, the ferrite core comprising a winding connected to a power supply source for generating an electromotive force for plasma generation in the discharge tube head, the discharge bridge and the process chamber; and a plurality of ring-shaped insulation members and ring-shaped vacuum seals each disposed between the hollow discharge tube head and each of the discharge tube bridges to allow plasma gases to uniformly diffuse toward a lower portion of the process chamber and to uniformly maintain the plasma at a high density while increasing the volume of the plasma.