We discuss the new physics which can be accessed with doubling the energies of CEBAF accelerator at Jefferson Lab. This relates to probing three-nucleon short range correlations in nuclei and measuring deep-inelastic nuclear structure at $x>1$ that will allow for the first time to probe the dynamics responsible for generation of super-fast quarks in nuclei. Other venues of research is the probing non-nucleonic structure of $NN$ interaction at distances relevant to the nuclear repulsive core. This can be achieved by measuring deuteron inclusive cross section at large $x$ and very large $Q^2$ or probing exclusive electro-disintegration of the deuteron at internal momenta above 1 GeV/c. Different models that describe the generation of such a large internal momenta will be discussed including effects of intermediate resonance state and hidden-color component.