Patent ID: 8741062

Claim:
An apparatus comprising: a deposition reactor comprising a vacuum chamber enclosing a sealable reaction chamber; a reaction chamber heater placed in the vacuum chamber; a precursor source configured for depositing material on a heated substrate in the deposition reactor by sequential self-saturating surface reactions; an in-feed line for feeding precursor vapor from the precursor source through the vacuum chamber to the sealable reaction chamber, the in-feed line going through a vacuum chamber wall of the reactor; and a structure configured to utilize heat from the reaction chamber heater for preventing condensation of precursor vapor into liquid or solid phase between the precursor source and the sealable reaction chamber, said structure comprising: a protruding internal neck arranged around said in-feed line, and said protruding internal neck protruding through said vacuum chamber wall; and an outer neck around the protrusion, the internal neck and the outer neck forming a gap there between.