Design of UVSOR Light Source at IMS

Abstract

A 600 MeV electron storage ring dedicated to ultraviolet gynchrotron orbital radiation research in molecular science and related fields has been designed. The maximum current is 500 mA with 1 hour Touschek lifetime. The photons in the 10-2000 Å region are mainly utilized. The ring is composed of eight bending magnet sections, and four long and four short straight sections. In both long and short straight sections, two doublets of quadrupoles are installed. From one bending section, two outlets of synchrotron radiation are available. To each outlet, two optical instruments will be attached. The emittance (ε <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) is typically 6π × 10 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-8</sub> m·rad, and the width (2σ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) of the beam at bending section is 0.6 mm and the height (2σ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">z</sub> ) is 0.4 mm assuming 10 % x-z coupling. Undulators will be installed at two long straight sections, where dispersion function is 0 and beam divergence is small. The remaining one long straight section is reserved for an inflector. Another long straight section is reserved for an RF cavity (in future two cavities) and a wavelength shifter. Pulsed light (width ≃ 0.5 nsec, interval ≃ 180 nsec, in future, width ≃ 0.1 nsec, interval ≃ 360 nsec, 540 nsec ......) is available. The injector is a 600 MeV synchrotron with a 15 MeV linac. The synchrotron is composed of six bending magnet sections and six straight sections. In each straight section, a doublet of quadrupoles are installed. The current is 50 mA, and the repetition rate is 1 ~ 3 Hz.