  The advantage of the linac-ring type electron proton collider is that it
allows for the straightforward construction of $\gamma$p collider. In a
$\gamma$p collider high energy photons can be generated from Compton
backscattering of laser photons off electrons from a linear accelerator. In
this study main parameters of photon-proton colliders based on some future
electron linear accelerator projects and protons supplied form LHC or FCC are
evaluated.
