Purpose and feature

he HKS vacuum system contains three parts, the HKS spectrometer, Enge spectrometer, and target chamber /dump lines. Each part has its own pumping station. The vacuum level of $10^{-5}$ is required for these parts. In order to avoid multiple scattering inside of the optics, all these parts are connected together then to beam line.

The only vacuum break is at the exit of the beam pipe. This is to protect the beam line vacuum against some possible work on the experimental parts.