High intensity proton synchrotrons and proton storage rings are being designed with TiN coated vacuum components to reduce electron cloud buildup, which can lead to multipacting and instabilities. It has been established that when the surfaces are irradiated with energetic electrons, the TiN coatings reduce the electron cloud buildup because the TiN has a higher work function when compared to metallic surfaces. The present work investigates the electron emission from these coatings when the surface is bombarded with 28 MeV protons, 126 MeV oxygen ions, and 182 MeV gold ions. Understanding the electron emission from ion bombardment is important for the machine collimator regions, where the beam halo is removed.

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