SED Machine Rainbow Camera 5 Bonding

A number of teams "pot" their lenses in cells with room-temperature vulcanizing (RTV) epoxy. We are using RTV60 to pot lenses into their aluminum cells. The method is to center the lenses in their aluminum cells using three precision pins as shown in the figure below.

Rainbow camera 5 - potting

The lens cell is made of 6061 Aluminum T6; which expands by about 1 micron every degree Centigrade. The glass in the cell is fused silica, which expands about 200x less. Thus the RTV which has a soft rubber-cement like consistency will absorb these differential stresses.