Varian Associates

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

Dual filament ion source with improved beam characteristics

Abstract: A Freeman type electron bombardment ion source includes dual filament electrodes positioned in an arc chamber having a slit for extraction of an ion beam. The filament electrodes are symmetrically positioned with respect to the extraction slit. The filament electrode currents are equal in magnitude and oppositely directed. As a result, lateral magnetic fields in the region of the extraction slit are substantially eliminated.

Quadrupole trap ion isolation method

Abstract: A method for efficiently filling a QIT (1) which isolates an ion range by employing a sequential part of supplemental broadband waveforms where the first such supplemental broadband waveform is applied during the period that the e-beam ionization bombardment takes place and the second such broadband waveform is applied after the e-beam bombardment ends.

Wafer processing chuck using multiple thin clamps

Abstract: A transport device is used to move a wafer into a processing chamber. Lifting pins receive the wafer and lower the wafer to the surface of the chuck. A multiplicity of thin clamping hooks swing over the edge of the wafer, centering the wafer and then clamp down on the edge of the wafer to hold the wafer firmly to the chuck. Grooves on the face of the chuck and internal channels in the chuck supply helium for thermal contact to the back of the wafer.

Magnetic stirrer improvement

Abstract: Improved magnetic stirring means for use with an optical absorption cell of the type characterized by a non-magnetic container for fluidic samples to be analyzed, which container has a rectangular cross-section of interior dimensions A × B, where A is relatively large compared with B. The stirrer comprises a magnetically responsive body positioned at the bottom of the container, for effecting agitation of the sample in response to a rotating magnetic field applied by field sources which rotate about a vertical axis beneath the container. The stirrer body is of generally cylindrical cross-section, of axial length slightly less than the dimension A, and of diameter slightly less than dimension B. The stirrer body is oriented with its axis in a horizontal plane, and thus its lateral periphery lies closely adjacent to the internal container walls. The body carries permanent magnet means toward one end thereof, which provide a pair of opposite magnetic poles displaced to alternate sides of the body axis. The externally applied rotating magnetic field, alternately attracts and repels the magnetic poles, and the body, by virtue of the constraints imposed by the cell walls, rotates about its horizontal axis. The body preferably carries surface portions which are parallel to the body axis, whereby rotation about said axis drives the surfaces through the sample, to promote the desired agitation. These surface portions may be defined at longitudinally extending notches formed into the cylinder.