Varian Associates

About: Varian Associates is a based out in . It is known for research contribution in the topics: Beam (structure) & Wafer. The organization has 2160 authors who have published 2591 publications receiving 46002 citations.

Target for x-ray tubes

Abstract: A target for x-ray tubes, which is comprised of separate elements mechanically connected together whereby the element which includes the x-ray generating focal area is of a selected material mechanically attached to at least one element of a second material by means which efficiently permits ready transfer of heat from the first element to the second while permitting free thermal expansion of the elements relative to one another.

High displacement rate,scroll-type, fluid handling apparatus

Abstract: A positive displacement fluid handling apparatus has a first, high volumetric displacement rate scroll pump of nested interacting pairs of fixed and movable spiral-shaped blades supported in a housing between an inlet and an outlet. Each adjacent blade pair is of sufficient angular extent, preferably only about 360°, to close an inter-blade pocket. In a preferred form for a vacuum pump, a second scroll pump mounted in the housing has its fluid inlet in direct fluid communication with the first scroll outlet. The second scroll has a single pair of co-acting fixed and movable blades with multiple revolutions with a relatively short axial height. The low back leakage of this second pump allows the first pump to omit tip seals on the free spiral edges of the blades. The volumetric displacement rate of the first pump exceeds that of the second pump. An orbiting plate carries the movable blades of both scroll pumps. The drive has a small crank radius which reduces seal velocity and wear, and reduces radial crank force. Ball thrust bearings held between recesses in the periphery and in the plate offset axially directed compressive forces while synchronizing the orbiting movement. A fan mounted on the drive air cools the apparatus. There is no oil or other liquid lubricant or coolant exposed to the working fluid.