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.

Semiconductor etching apparatus with magnetic array and vertical shield

Abstract: In an apparatus for etching a large semiconductor wafer the etch rate and uniformity of etching at the edges is improved by using an array of magnets behind the collector plate to form a double ring of plasma and using a grounded shield ring with perforations to pass gases. The shield ring extends both above and below the surface of the wafer being etched.

Ultrasound hyperthermia applicator with variable coherence by multi-spiral focusing

Abstract: An ultrasound hyperthermia applicator comprises a plurality of transducers which can be operated in different grouping modes so that the applicator is effectively provided with a variable number of elements having variable effective diameters transmitting coherent beams. The individually coherent beams from these elements are individually focused for incoherent superposition in the target volume according to a spiral or multi-spiral focusing scheme. Such an applicator is capable of uniformly heating without scanning a limited part of human body with volume greater than the inherent focal size of the individual transmitter element.

System and method for improving sample concentration in capillary electrophoresis

Abstract: The method for improving sample concentration in capillary electrophoresis by extracting the sample buffer from the capillary column using the electro-osmotic flow while the sample components are stacked into the support buffer utilizes a system for this technique. The system has a separation column (11), sample introduction means (16) for injecting the sample solution, an injection detector means (20) for detecting the volume of injected sample solution, a separation detector means (21) for detecting the sample components, power supply means (17) for applying a high voltage along the separation column (11) for reversing the direction of the electro-osmotic flow thereby causing extraction of the sample buffer from the separation column and afterward providing the separation sample into its components.