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Extremely low emittance electron beams are necesarry for new generation accelerators. The value of the required emittances is as low as 0.1 π.mm.mrad. NEA-type photocathodes have an intrinsic advantage for generating such a low emittance beam. In this paper, emittance measuremets of photelectrons extracted from two different NEA phtocahtodes are described. The measurements were carried out using Nagoya University 200kV polarized electron source. The normalized RMS emittances of bulk-GaAs and GaAs-GaAsP superlattice strained photocathodes are as low as 0.12–0.17 ± 0.02 π.mm.mrad and 0.09 ± 0.01 π.mm.mrad with very low charge density, respectively. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

Tokyo Denkai is a high-purity tantalum and niobium supplier in Japan. It started niobium production in 1968. Niobium items, such as sheets, rods, and tubes, are provided as superconducting cavity material for the world’s accelerator projects. Tokyo Denkai has five EB (Electron Beam) Melting Furnaces and in the future, will install two more. One existing EB furnace, which has a melting power of 400 KW, is currently used only for niobium production. Because the furnace is not sufficient to melt a 270-mm diameter ingot, which is required for the L-Band Single Crystal half-cell, starting from July 2007 we will melt large-diameter ingots with a 1200-KW EB furnace. This paper provides information on our niobium production capacity and future investment plan to meet the large demands of the International Linear Collider (ILC) project. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

Saga prefectural government operates a synchrotron light facility mainly for industrial applications of the synchrotron light. The facility comprises a 1.4 GeV storage ring, a 250 MeV linac as an electron injector and beamlines. The lattice of the storage ring is designed to perform as small emittance as 25 nm-radian and has long straight sections of 2.9 m length for installing insertion devices. Three beam lines have been prepared by Saga prefectural government and one by Saga University. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

Nagoya University has a project to construct a new synchrotron light facility, called Photo-Science Nanofactory, to develop a wide range research on basic science, industrial applications, life science and environmental engineering in collaboration with universities, research institutes and industries. The key equipment of the facility is a compact electron storage ring, “Nagoya University Small Synchrotron Radiation facility (NSSR),” which is able to supply hard x-rays. The plan of the specifications is as following. The energy of the stored electron beam is 1.2 GeV. The circumference is 62.4 m. Natural emittance is about 60 nmrad. The configuration of the storage ring is considered based on the Triple Bend Achromat with twelve bending magnets. Eight of them are normal conducting magnets. Four of them are 5T superconducting magnets (super-bends). The bending angle is 12 degrees and two or three hard x-ray beam lines can be constructed for each super-bend. The number of beam lines from normal conducting bending magnets is more than 16. In addition, we will install two undulators in straight sections. The electron beam is injected from a booster synchrotron with the energy of 1.2 GeV as full energy injection. A 50 MeV linac is used as an injector to the booster synchrotron. The top-up operation is also planned. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]

We present a design of the injector part for the Super-SOR ring of the University of Tokyo, which is a 3rd generation type vuv light source and is aimed to operate with top-up operation scheme. In order to realize top-up operation, this injector consists of a pre-injector and a synchrotron. The pre-injector is a 200MeV linac and injects the electron beam into the synchrotron. In the synchrotron, the electron beam is accelerated from 200MeV up to 1.8GeV and its emittance and energy spread are reduced. In order to realize this low emittance beam, modified FODO lattice is applied. The details are presented in this section. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]