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A normal-conducting accelerating ring (NAR) has been constructed with a Chasman-Greentype lattice. The NAR has two basic aims. One aim is to prove the feasibility of the novel accelerating and storage scheme, in which the NAR accelerates the injected 15-MeV electrons to the final energy of 800 MeV, and directly stores them. The other aim is to make the NAR a multipurpose ring. That is, it acts as a booster for the superconducting storage ring, and it supplies the synchrotron radiation with the critical wavelength, 20.2 A. To achieve a high beam current, particular considerations have been taken with injection, rf system, magnetic field tracking, and vacuum formation. The NAR has experienced acceleration and storage at the final energy, 800 MeV. The initial beam current is about 20 mA in the 800 MeV storage mode. [ABSTRACT FROM AUTHOR]

A superconducting electron storage ring fully dedicated to x-ray lithography has been developed. It has a racetrack shape, consisting of two superconducting bending magnets, other normal conducting multipole magnets, rf system, vacuum system, and beam monitoring systems. The storage ring circumference is 16.8 m. The critical wavelength (λc) is 17.3 Å. The beam size (σ) at every synchrotron radiation source point is less than 1 mm. This machine employs the energy-boost-in-the-ring scheme; electrons are injected at around 15 MeV and then accelerated to 600 MeV in the ring. The injector is a newly developed linear accelerator with an energy compression system. Higher-energy injection is also available. [ABSTRACT FROM AUTHOR]