Non-Scaling FFAG lattice for the eRHIC

The future electron ion collider eRHIC the ``QCD test facility'' will continue extraordinary results of the present Relativistic Heavy Ion Collider RHIC. There will be collisions between polarized electrons with heavy ions and with polarized protons/He$^{3}$ using existing superconducting RHIC accelerator and with electrons accelerated inside of the existing tunnel. Electron acceleration will be with the Electron Recovery Linac (ERL) with a combination with Non-Scaling Fixed Field Alternating Gradient arcs. Two NS-FFAG allow electrons to pass through the same structure with an energy range between 1.334 and 21.1 GeV. After collisions the beam is brought back by the NS-FFAG's and decelerated to the initial energy and directed to the dump.