Saving energy and stabilization for accelerator power supply

Large Scale Research Facility such as J-PARC is faced on a budgetary deficit and also environmental concerns. Then, affordable and sustainable energy supply should be considered to continue and develop the big science. Magnets of the synchrotron are excited by a pulse operation power supply, and then the load fluctuation should be a severe problem. An energy storage system, such as superconducting magnetic energy storage (SMES), fly-wheel generator so far are expected to protect the load fluctuation and the instantaneous voltage drop. The author has investigated about the application to the accelerator power supply of SMES. In this report, he will describe the resent status and future of the energy storage systems for large scale research facilities especially an accelerator facility. Feasibility of the sustainable energy supply will be discussed. (author)