The efficiency of the injection from the linear accelerator into the damping ring of the injection complex at Budker Institute of Nuclear Physics has been experimentally studied. The estimations of the injection efficiency are in good agreement with the measurements. A method for increasing the efficiency of injection from the linear accelerator into the damping ring has been implemented in order to enhance the productivity of the injection complex. To this end, the RF cavity has been replaced and the RF frequency was changed from 700 to 11 MHz. Recent measurements have shown a two-fold increase in the productivity. Besides that, the behavior of the longitudinal profile of a bunch during the first turns in the damping ring and the dependence of the profile on the beam current have been studied.