Patent ID: 7563328

Claim:
A gas injection system for a processing reactor, the processing reactor including a mass flow controller and a vacuum chamber with an inject plate configured to be located above a substrate, said gas injection system comprising: a valve system having an inlet adapted to be connected to the mass flow controller, a first outlet, and a second outlet; a principle gas feed line connected to said first outlet of said valve system, said principle gas feed line being adapted to be connected to the inject plate; a start-up line connected to said second outlet of said valve system, said start-up line having an orifice adapted to be connected to the vacuum chamber at a position not above the substrate; and a controller configured to control said valve system to redirect gas flow to said start-up line and restrict gas flow to the principle gas feed line during a predetermined start-up period of the processing reactor, and to control said valve system to redirect gas flow to the principle gas feed line after said predetermined start-up period has ended.