Energy transfer in the high-voltage electron cooler for the COSY synchrotron ring

Abstract

An electron cooler produced by the Budker Institute of Nuclear Physics was put into operation at the COSY synchrotron (Julich, Germany) in 2013. This electron cooler has been designed for suppressing the effect of beam scattering by an internal target at energies as high as the maximum proton beam energy of 3 GeV. As the electron cooler was developed, many complicated electrotechnical problems were solved. One of these problems was the transfer of the electric power to many electronic consumers kept at a high electric potential. Several practical methods for solving this problem are described. These variants were analyzed and tested while designing the cooler construction. The final decision is based on the principle of operation of the cascade transformer containing 33 sections connected in series. The described design solutions can be used not only for future electron coolers in projects NICA-JINR (Dubna, Russia), FAIR (Germany), and MEIC (United States), but also for other high-voltage facilities requiring power transfer to devices held at a high potential. After decommissioning of the electron cooler at Fermilab (United States), the described facility has become the highest-voltage electron cooler worldwide.