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.

Racetrack microtron beam extraction system

Abstract: Beam extraction from a selectable orbit of a race track microtron is achieved using small angle magnetic deflections toward the common axis of acceleration. The extracted beam and the non-recirculated beam are adapted to occupy congruent final trajectories whereby the non-recirculated beam is available on the same axis as the selectably extracted beam.

Octave electronic tuning of a CW Gunn diode using a YIG sphere

Abstract: Octave electronic tuning of CW Gunn diodes using a YIG sphere has been achieved in the range 6 to 18 GHz. Output power exceeded 50 mW throughout the range 6.9 to 8.5 GHz for narrower-band operation.

Sputter coating apparatus having improved target electrode structure

Abstract: A gaseous discharge sputter coating apparatus is described for sequentially sputtering different materials onto discrete batches of substrate objects. The apparatus includes a chamber defining a controlled environment capable of sustaining a gaseous discharge, a table within the chamber for supporting separate batches of substrate objects, and means for sustaining a gaseous discharge within the chamber. A plurality of target electrode structures is also provided, each of which has a surface in the chamber which has a layer on it of one of the materials desired to be coated onto the substrate objects. The target electrode structures are part of the wall of the controlled environment chamber, and each includes an insulating material separating it from the remainder of the wall. In order to obviate the necessity of including a ground shield around each of the target electrodes, only that portion of the electrode within the chamber having the material on it has power applied to it to cause the sputtering. The target electrode structures are detachably secured to the remaining portion of the wall so that they may be removed for servicing.

Dosimetry considerations for a lipowitz metal tissue compensator system

Abstract: The present report describes the fabrication technique and the dosimetry aspects of a new compensator system that uses the low melting point allow Lipowitz metal. Compensating ratios (CR, mm of tissue compensated per mm of cerrobend) were determined for various field sizes and depths for 60 Co, and X ray energies of 4, 6, 18, and 25 MV. Typical CR for 10 cm × 10 cm field and 10 cm depth were: 60 Co, 4 MV, and 6 MV,1:15;18 and 25 MV, 1:20. Verification of these CR were performed at 6 MV using polystyrene phantoms. Ionization measurements were made for various field sizes and depths and normalized to central axis full-phantom readings for both compensated and non-compensated fields. Without compensation, percent differences ranged as high as 40% for a tissue deficit of 10 cm. With the compensating filters (CF) in place, this difference was reduced to 2–4% Overall, the CF system was capable of producing dose uniformity to within ±10% for a wide range of depths and field sizes.