Abstract: An apparatus and method for molecular beam epitaxy are described herein. The apparatus comprises an enclosure defining a vacuum chamber. A substrate holder is mounted within the vacuum chamber. At least one molecular beam source is in fluid communication with the vacuum chamber. A cooling shroud having at least one surface is mounted within the vacuum chamber spaced from the substrate holder. A cryocooler having at least a portion extending into the vacuum chamber is operatively coupled to the cooling shroud for extracting heat therefrom, and cooling the at least one surface of the cooling shroud to cryogenic temperatures.

Abstract: An apparatus and method for molecular beam epitaxy are described herein. The apparatus comprises an enclosure defining a vacuum chamber. A substrate holder is mounted within the vacuum chamber. At least one molecular beam source is in fluid communication with the vacuum chamber. A cooling shroud having at least one surface is mounted within the vacuum chamber spaced from the substrate holder. A cryocooler having at least a portion extending into the vacuum chamber is operatively coupled to the cooling shroud for extracting heat therefrom, and cooling the at least one surface of the cooling shroud to cryogenic temperatures.

Abstract: The invention provides a steering assembly (10, 10a) including a first shaft (28, 28a) having a first longitudinal axis (29, 29a). The steering assembly (10, 10a) also includes a second shaft (32, 32a) having a second longitudinal axis (33, 33a). The first and second longitudinal axis (29, 29a, 33, 33a) are transverse and offset with respect one another. The first and second shafts (28, 28a, 32, 32a) are engaged at an intersection (35, 35a) such that the second shaft (32, 32a) translates along the second longitudinal axis (33, 33a) in response to rotation of the first shaft (28, 28a) about the first longitudinal axis (29, 29a). The steering assembly (10, 10a) also includes a bearing member (34, 34a, 34b, 34c) contacting the second shaft (32, 32a). The bearing member (34, 34a) is moveable along a bearing axis (37, 37a) extending transverse to both of the first and second longitudinal axis (33, 33a) at the intersection (35, 35a) to support the second shaft (32, 32a).