Design of a Noble Gas Cerenkov for the Super High Momentum Spectrometer for 12 GeV at Jefferson Lab

The 12 GeV upgrade of the accelerator and the associated experimental facilities at Jefferson Lab will provide innumerable new opportunities for nuclear science. In Hall~C the new Super High Momentum Spectrometer (SHMS) will provide excellent angular and momentum resolution up to a maximum central momentum of 11 GeV/c and a diverse set of directed studies, from the spin structure of the neutron to multi-nucleon correlations in nuclei, are planned. These and other approved experiments demand robust particle identification. As part of the electron identification and pion rejection package, a 2 meter long, 4-mirror noble gas Cerenkov counter is being built. The design principles, expected performance and status of the project will be presented.