Development of Five Compact Storage Rings, TERAS, NIJI-I–IV, at ETL

Abstract

At the Electrochemical Laboratory (ETL) four compact storage rings, TERAS, NIJI-I–III, have been already constructed and a compact storage ring, NIJI-IV, with long straight sections for FEL experiments will be constructed in 1990. TERAS is an 800-MeV storage ring. It has been operated since Oct. 1981 for research on atomic, molecular and solid state physics and ULSI lithography, generation of polarized SR and gamma-rays and for a free electron laser (FEL) experiment. NIJI-I (NIJI means rainbow) is a 270-MeV compact ring and has been operated from Feb. 1986 to March 1989 for machine studies of beam storage higher than 0.5 A at low energies below 150 MeV. NIJI-II is a 600-MeV conventional type compact ring and was operated in July 1989.NIJI-III is a 620-MeV superconducting type ring. NIJI-II and NIJI-III will be used for FEL and ULSI lithography experiments. Before the superconducting magnets are installed, NIJI-III with conventional type magnets has already been constructed and operated in June 1989. The conventional type magnets of NIJI-III will be replaced by superconducting type ones, starting in the fall of 1989 one by one. NIJI-IV is a 500-MeV conventional type compact ring with straight sections longer than 5 m where an optical klystron can be installed to achieve a high gain FEL experiment.