Detector dewar assembly

Abstract

An improved detector dewar assembly in which the flange supporting the upper cap of the dewar assembly comprises a disc ceramic matrix, including buried electrical leads. This disc serves several purposes. First, it provides a vacuum tight electric feedthrough which connects a tape cable from the detector assembly to a pin assembly imbedded in the exterior portion of the disc feedthrough. Second, it includes metalizations on its top and lower surface in order to provide a surface for connecting (by brazing or soldering) the upper cap assembly and the major vessel wall. A tape cable comprising wires embedded in a flexible nonconductive matrix connects the detector element leadout wires with the electrical connectors of the feedthrough disc. The cable forms a collar which substantially surrounds the coldwell and has tabs at its basal portion which fold up to attach to pin or pad connectors on the lower surface of the disc. The use of Manganin, Constantan, or Balco wires produces a tape cable which significantly reduces the heat load on the dewar refrigerator system. Solder/bond rings and pads positioned both on the endwell and disc assembly mate to solder bond/rings and pads/dots positioned on the tape cable thereby providing stress relief.