Projects for new accelerators for study on nuclear electromagnetic interactions

Designs of new electron accelerators of third generation intended for investigation of nuclei electromagnetic interactions are described. The accelerators of design parameters (electron energy is 1-2 GeV, coefficient of time occupation by the beam is 100%, beam current is 100 μA) are subdivided into 3 categories: 1) accelerators with a beam uninterrupted in time with beam recirculation using superconducting accelerating structures on standing wave; 2) accelerators with a beam uninterrupted in time with beam recirculation using ''warm'' accelerating structures on standing wave and 3) pulsed accelerators with low occupation coefficient operating in combination with beam-stretcher of the beam. Analysis of the designs has revealed that use of beam recirculation is an inalienable feature of all the accelerators of continuous operation. It is also revealed that pulsed accelerators (linear or split microtron) with the ring-stretcher are perspective ones