The dimension of the circular hole drilled in the gasket, the gasket material, the original final thikness of the indented region as well as the dimensions of the diamonds culet are some of the most important factors determining the maximum reachable pressure in a DAC.
The thikness gauge is a necessary tool to measure the thickness of the gasket after indenting.
Though a few empirical rules are followed, low values for all mentioned parameters are usually required when dealing with extreme pressures.
The gasket is a thin sheet of material that has a small hole about ½ diameter of the cutlet face – typically from 50 to 200 microns. The gasket is used to contain the sample, especially if the sample is composed of or surrounded by a fluid. The steep pressure gradient discussed above is contained in the gasket which spares the sample. Rhenium is commonly used for the gasket, but Inconel, Kapton, Cu, Be are also used.
Measuring the gasket