Patent ID: 6106281
Filing Date: 2000-08-22
Classification: B23K,F27B,F27D,F28D

Abstract:
A temperature-controlled chamber, comprising:an interior, an exterior and a first opening connecting the interior and the exterior,the interior comprising a first interior gas near the first opening, the first interior gas near the first opening having a first interior temperature, a first interior pressure, a first interior composition and a first interior density, the exterior comprising an exterior gas having an exterior temperature, an exterior pressure, an exterior composition and an exterior density, the first interior pressure and the exterior pressure being essentially equal to each other,wherein the composition of the first interior gas is chosen such that the first interior density is closer to the exterior density than would be the case if the first interior gas were a pure gas species,whereby there is achieved a reduction in the motion of the gases near the first opening driven by the difference between the first interior density and the exterior density.